{ "data": { "a": { "slug": "pirate-weather", "name": "Pirate Weather", "vendor": "Pirate Weather", "vendorUrl": "https://pirateweather.net", "kind": "http-api", "category": "weather", "summary": "Open-source weather API with Dark Sky-compatible responses, forecasts, alerts and historical data from public weather models.", "url": "https://www.anchorterminal.com/tools/pirate-weather", "markdownUrl": "https://www.anchorterminal.com/tools/pirate-weather.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/pirate-weather.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/pirate-weather.json", "repo": "https://github.com/Pirate-Weather/pirateweather", "license": "Apache-2.0 (docs and spec), AGPL-3.0 (API code)", "transports": [ "http", "streamable-http" ], "remoteUrl": "https://api.pirateweather.net/forecast", "packages": [], "auth": "api-key", "authNotes": "The key is a path segment, /forecast/{key}/{lat},{lon}, or an apikey request header with any placeholder in the path. The MCP server takes the same key as the apikey query parameter on its URL. Keys are issued through an Apiable portal at pirate-weather.apiable.io and can take up to 20 minutes to go live.", "pricing": "freemium", "pricingNotes": "Free at 10,000 calls a month. A $2 a month plan raises that to 20,000, and GitHub Sponsors takes one-off donations. Higher plans are sold through pirate-weather.apiable.io, which renders only with JavaScript, so we couldn't read them (https://pirateweather.net/en/latest/).", "priceSummary": "$2 / mo", "where": "hosted", "x402": { "level": "no", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 907, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-09-30" }, "docsUrl": "https://pirateweather.net/en/latest/API/", "openapi": "https://github.com/Pirate-Weather/pirateweather/blob/main/PW_OpenAPI.yaml", "capabilities": [ "weather.current", "weather.forecast", "weather.historical", "weather.alerts", "data.weather" ], "tags": [ "hosted", "open-source", "freemium", "free-tier", "no-card", "mcp", "openapi", "status-page" ], "lastRelease": "2026-09-23", "graded": true, "anchor": { "graded": true, "score": 65.9, "grade": "B", "agentReady": false, "rank": 249, "ranked": true, "rankOf": 722, "categoryRank": 3, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 77, "maintenance": 80, "payments": 30, "reliability": 75, "schema": 85, "security": 45, "transparency": 68 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "Named model sources and a documented priority order for every field. No SLA, and the terms call it best effort.", "bestFor": "Agents and apps that want Dark Sky-shaped forecasts, model transparency and deep history on a small budget.", "strengths": [ "Named model sources and a documented priority order for every field", "OpenAPI 3.1 spec at version 2.10.2 and a dated changelog with a pull request per change", "Four releases between 9 July and 23 September 2026", "ERA5 history to January 1940 and URMA for the last 10 days in North America", "Response-sizing parameters that cut a forecast to the blocks and rows asked for" ], "weaknesses": [ "No SLA, and the terms call it best effort", "Key in the URL path by default, and only in the query string for the MCP server", "Plans above $2 a month sit behind a JavaScript-only portal, and signup needs a person", "No security.txt, SECURITY.md or MCP registry entry", "The privacy notice and terms are generator templates from 2024 and say nothing on data reuse" ], "agentNotes": [ "Send the key in an apikey header and put a placeholder in the path so it stays out of logs", "Pass blocks= and hourly_indices= or daily_indices= to get only the rows you need. The default payload is large", "Ask for version=2 to get fields Dark Sky never had, such as smoke, fire index and the source list", "Point historical requests at timemachine.pirateweather.net with a UNIX timestamp after the coordinate", "Watch Ratelimit-Remaining. The cap is monthly, so a runaway loop can spend it in a day" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 4, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "B", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 65.9 } ], "editorialScores": { "ergonomics": 77, "maintenance": 80, "payments": 30, "reliability": 75, "schema": 85, "security": 45, "transparency": 55 }, "provenanceScore": 80, "dataQualityScore": 72 }, "connect": { "http": "curl -H \"apikey: $PIRATE_WEATHER_API_KEY\" \"https://api.pirateweather.net/forecast/key/51.51,-0.13?units=si\u0026exclude=minutely\u0026version=2\"", "claudeCode": "claude mcp add --transport http pirate-weather \"https://mcp.pirateweather.net/mcp?apikey=$PIRATE_WEATHER_API_KEY\"", "config": { "mcpServers": { "pirate-weather": { "type": "http", "url": "https://mcp.pirateweather.net/mcp?apikey=${PIRATE_WEATHER_API_KEY}" } } } }, "letme": { "capability": "https://letme.dev/weather.current", "tool": "https://letme.dev/pirate-weather" }, "area": "domain-data", "unitPrices": [ { "item": "Supporter plan", "unit": "month", "usd": 2, "note": "20,000 calls a month" }, { "item": "Call on the Supporter plan, at the cap", "unit": "1k-requests", "usd": 0.1, "note": "$2 over 20,000 calls" } ], "provenance": { "legalEntity": "PirateWeatherAPI (Ontario, Canada)", "domain": "pirateweather.net", "domainRegistered": "2021-03-01", "endpointOnVendorDomain": true, "terms": "https://pirateweather.net/en/latest/Apiable/ApiableTerms/", "privacy": "https://pirateweather.net/en/latest/Apiable/ApiablePrivacy/", "statusPage": "https://pirateweather.xitoring.io/", "changelog": "https://pirateweather.net/en/latest/changelog/", "securityTxt": "none", "checked": "2026-09-30", "notes": [ "The terms (last updated 2024-09-23) are generator-made, name the company only as PirateWeatherAPI in Ontario, Canada, and cap liability at $100 or what you paid.", "The terms of service add one rule of their own, don't circumvent the call limit with multiple accounts, and say the data shouldn't be used for life or property critical applications.", "Keys, plans and billing run through a third-party Apiable portal at pirate-weather.apiable.io.", "pirateweather.net/.well-known/security.txt returns 404." ], "score": 80 }, "dataQuality": { "coverage": "Global, strongest in North America where NBM and HRRR apply at about 3 km, with Canadian models in Canada and DWD MOSMIX stations elsewhere", "coverageRating": 4, "freshness": "RTMA-RU every 15 minutes, HRRR and NBM hourly, global models every 6 hours", "freshnessClass": "hourly", "history": "ERA5 reanalysis from January 1940, the project's archive of 1-hour forecasts from June 2024, and URMA analyses for the last 10 days in North America since 2.10.1", "historyYears": 86, "methodology": "https://pirateweather.net/en/latest/DataSources/", "sourcesDisclosed": true, "licence": "Apache-2.0 docs, AGPL-3.0 API code, terms silent on data reuse", "licenceClass": "unclear", "standing": "", "standingClass": "none", "reuse": "The terms say nothing about caching or redistributing responses and add only two rules, no circumventing the call limit with extra accounts and no life or property critical use. The models behind the data are public data from NOAA, ECMWF open data, ECCC and DWD.", "score": 72, "checks": null }, "pageJsonUrl": "https://www.anchorterminal.com/tools/pirate-weather.json", "live": { "slug": "pirate-weather", "probe": { "target": "https://api.pirateweather.net/forecast", "method": "get", "lastAt": "2026-10-08T20:09:55.469162387Z", "lastOk": true, "lastStatus": 404, "lastMs": 234, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 107, "p95ms24h": 166, "samples24h": 272, "samples30d": 1944, "days": [ { "date": "2026-10-01", "probes": 109, "ok": 109 }, { "date": "2026-10-02", "probes": 248, "ok": 248 }, { "date": "2026-10-03", "probes": 271, "ok": 271 }, { "date": "2026-10-04", "probes": 272, "ok": 272 }, { "date": "2026-10-05", "probes": 272, "ok": 272 }, { "date": "2026-10-06", "probes": 272, "ok": 272 }, { "date": "2026-10-07", "probes": 272, "ok": 272 }, { "date": "2026-10-08", "probes": 228, "ok": 228 } ] }, "vendorStatus": { "page": "https://pirateweather.xitoring.io", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-10-08T19:39:03.886978743Z" }, "githubStars": 909, "securityTxt": { "url": "https://pirateweather.net/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-08T15:38:40.690686406Z" }, "domain": { "domain": "pirateweather.net", "registered": "2021-03-01", "source": "https://rdap.verisign.com/net/v1/domain/pirateweather.net", "checkedAt": "2026-10-04T13:04:40.132666729Z" }, "pages": [ { "url": "https://pirateweather.net/en/latest/changelog/", "kind": "changelog", "status": 404, "checkedAt": "2026-10-08T18:23:01.504735346Z", "changedAt": "0001-01-01T00:00:00Z" }, { "url": "https://pirateweather.net/en/latest/Apiable/ApiablePrivacy/", "kind": "privacy", "status": 404, "checkedAt": "2026-10-08T18:22:57.387731913Z", "changedAt": "0001-01-01T00:00:00Z" }, { "url": "https://pirateweather.net/en/latest/Apiable/ApiableTerms/", "kind": "terms", "status": 404, "checkedAt": "2026-10-08T18:22:59.497418672Z", "changedAt": "0001-01-01T00:00:00Z" } ], "updatedAt": "2026-10-08T20:09:55.469162387Z" } }, "answer": "Pirate Weather scores 65.9 (B) on agent readiness against Tomorrow.io Weather API's 51.4 (D), and leads in every scored category.", "b": { "slug": "tomorrow-io", "name": "Tomorrow.io Weather API", "vendor": "The Tomorrow Companies Inc.", "vendorUrl": "https://www.tomorrow.io", "kind": "http-api", "category": "weather", "summary": "Tomorrow.io's Weather API returns current conditions, forecasts, recent and archived history, map tiles, route weather and alert webhooks for a coordinate, place name or GeoJSON shape. It is a REST API with a hosted MCP server.", "url": "https://www.anchorterminal.com/tools/tomorrow-io", "markdownUrl": "https://www.anchorterminal.com/tools/tomorrow-io.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/tomorrow-io.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/tomorrow-io.json", "license": "Proprietary service under Tomorrow.io's subscription terms", "transports": [ "http" ], "remoteUrl": "https://api.tomorrow.io/v4", "packages": [], "auth": "mixed", "authNotes": "A person signs up in a browser and copies the key from the dashboard. The key goes in an `apikey` header or query parameter on REST calls and in `X-Api-Key` for the MCP server. The docs say keys carry full privileges, and more keys are created by an account manager. The MCP endpoint also advertises OAuth with dynamic client registration, PKCE and one scope, `mcp:read`.", "pricing": "freemium", "pricingNotes": "Free plan with no published price for anything above it. Free covers core data layers, a 5-day forecast, 24 hours of history, one monitored location and one alert, and the terms bar commercial use on self-generated accounts. Enterprise is by quote and adds the 14-day forecast, premium layers, routes, maps and the historical archive, which is metered in tokens with no public token price (https://www.tomorrow.io/weather-api/, checked 2026-10-08).", "priceSummary": "Freemium", "where": "hosted", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the docs, the OpenAPI file or the plan table (checked 2026-10-08).", "endpoints": [] }, "toolCount": 11, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-10-08" }, "docsUrl": "https://docs.tomorrow.io/reference/welcome", "llmsTxt": "https://docs.tomorrow.io/llms.txt", "openapi": "https://docs.tomorrow.io/openapi/tomorrowio-api.json", "capabilities": [ "weather.current", "weather.forecast", "weather.historical", "weather.alerts", "weather.marine", "data.weather" ], "tags": [ "hosted", "freemium", "free-tier", "closed-source", "openapi", "llms-txt", "mcp", "webhooks", "status-page", "sales-led", "us" ], "lastRelease": "2026-07-14", "graded": true, "anchor": { "graded": true, "score": 51.4, "grade": "D", "agentReady": false, "rank": 578, "ranked": true, "rankOf": 722, "categoryRank": 10, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 73, "maintenance": 27, "payments": 20, "reliability": 55, "schema": 75, "security": 34, "transparency": 63 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-08" }, "negative": 0, "verdict": "A public OpenAPI 3.1 file, Markdown docs with llms.txt and a hosted MCP server with 11 tools suit agents, and a free plan exists. Paid prices are by quote only, free keys are barred from commercial use, the docs give no numeric rate limits, and the status page lists 50 incidents in 85 days, mostly stale or degraded data.", "bestFor": "Teams that need minute-level and route or polygon forecasts, alert webhooks and a hosted MCP server, and will buy through sales.", "strengths": [ "Public OpenAPI 3.1.0 file (version 4.0.1, 31 paths, 39 operations), plus llms.txt and a Markdown copy of every docs page", "Hosted MCP server at api.tomorrow.io/v4/tomorrow-weather/mcp with 11 documented tools, added in April 2026", "The `fields`, `timesteps`, `startTime` and `endTime` parameters size a Timelines response to what the task needs", "Six-digit error codes that the docs say stay fixed, and soft warnings returned beside partial data", "Alert webhooks signed with HMAC-SHA256 in an `X-Signature` header, retried up to two times" ], "weaknesses": [ "No public price for paid use. The plan table lists Free and Enterprise, the second by quote", "The subscription terms bar commercial use on self-generated accounts and forbid storing unaltered data without an order", "No numeric rate limits in the reviewed docs, and remaining-limit headers are documented for Enterprise accounts only", "Keys carry full privileges and may be sent as an `apikey` query parameter. More keys come through an account manager", "50 incidents on the status page between 15 July and 2 October 2026, 25 naming the Timeline or Historical API", "No official SDK, no security.txt, and no certification or disclosure policy found on the pages read" ], "agentNotes": [ "Send the key in the `apikey` header, not the query string, so it stays out of URLs and logs", "Request only the `fields` and `timesteps` needed on POST /timelines. Free plans cover 24 hours back and 5 days ahead at `1h` and `1d`", "Split archive requests. POST /historical takes at most 31 days per call and deducts tokens, 1 for a point and 10 for a polygon", "Treat 401 with code 401001 as a missing or bad key. The docs say 403, the live API answered 401 on 8 October 2026", "On 429 back off without a hint. `Retry-After` is documented only for 503", "Check the plan's terms before storing or reselling responses. Free accounts are limited to non-commercial use with a Powered by Tomorrow.io link" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "D", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 51.4 } ], "editorialScores": { "ergonomics": 73, "maintenance": 27, "payments": 20, "reliability": 55, "schema": 75, "security": 34, "transparency": 42 }, "provenanceScore": 84 }, "connect": { "http": "curl --request GET --url 'https://api.tomorrow.io/v4/weather/realtime?location=42.3478,-71.0466' --header 'apikey: API_KEY'", "config": { "mcpServers": { "tomorrow-weather-mcp": { "headers": { "X-Api-Key": "${TOMORROW_API_KEY}" }, "type": "http", "url": "https://api.tomorrow.io/v4/tomorrow-weather/mcp" } } } }, "letme": { "capability": "https://letme.dev/weather.current", "tool": "https://letme.dev/tomorrow-io" }, "area": "domain-data", "provenance": { "legalEntity": "The Tomorrow Companies Inc.", "domain": "tomorrow.io", "domainRegistered": "2012-02-15", "endpointOnVendorDomain": true, "terms": "https://www.tomorrow.io/legal/terms-of-service/", "privacy": "https://www.tomorrow.io/legal/product-privacy-policy/", "statusPage": "https://status.tomorrow.io", "changelog": "https://docs.tomorrow.io/reference/release-notes", "securityTxt": "none", "checked": "2026-10-08", "notes": [ "The subscription terms (last updated 19 October 2023) name The Tomorrow Companies Inc., a Delaware corporation with its principal place of business in Boston, Massachusetts, and cover the API, the dashboard and the data portal.", "The product privacy policy (last updated 17 December 2024) covers the API and platform and names Tomorrow.io Inc. as operator. The website has a separate privacy policy and terms of use, which we did not use here.", "The API and the MCP server answer at api.tomorrow.io.", "www.tomorrow.io, tomorrow.io and api.tomorrow.io each return 404 for /.well-known/security.txt.", "RDAP gives a registration date of 2012-02-15 for tomorrow.io. The status page runs on Atlassian Statuspage." ], "score": 84 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/tomorrow-io.json", "live": { "slug": "tomorrow-io", "probe": { "target": "https://api.tomorrow.io/v4", "method": "get", "lastAt": "2026-10-08T20:10:03.448532314Z", "lastOk": true, "lastStatus": 404, "lastMs": 309, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 152, "p95ms24h": 187, "samples24h": 30, "samples30d": 30, "days": [ { "date": "2026-10-08", "probes": 30, "ok": 30 } ] }, "vendorStatus": { "page": "https://status.tomorrow.io", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-08T20:01:24.414290825Z" }, "pages": [ { "url": "https://docs.tomorrow.io/reference/release-notes", "kind": "changelog", "status": 200, "checkedAt": "2026-10-08T18:19:37.617241436Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "5c08804d147f" }, { "url": "https://www.tomorrow.io/legal/product-privacy-policy/", "kind": "privacy", "status": 0, "checkedAt": "2026-10-08T18:31:01.004304542Z", "changedAt": "0001-01-01T00:00:00Z", "blockedByRobots": true }, { "url": "https://www.tomorrow.io/legal/terms-of-service/", "kind": "terms", "status": 0, "checkedAt": "2026-10-08T18:31:01.446636319Z", "changedAt": "0001-01-01T00:00:00Z", "blockedByRobots": true } ], "updatedAt": "2026-10-08T20:10:03.448532314Z" } }, "facts": [ { "a": "HTTP API", "b": "HTTP API", "name": "Kind" }, { "a": "Pirate Weather", "b": "The Tomorrow Companies Inc.", "name": "Vendor" }, { "a": "https://api.pirateweather.net/forecast", "b": "https://api.tomorrow.io/v4", "name": "Hosted endpoint" }, { "a": "HTTP, Streamable HTTP", "b": "HTTP", "name": "Transports" }, { "a": "API key", "b": "OAuth or key", "name": "Auth" }, { "a": "Freemium", "b": "Freemium", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "Apache-2.0 (docs and spec), AGPL-3.0 (API code)", "b": "Proprietary service under Tomorrow.io's subscription terms", "name": "Licence" }, { "a": "none", "b": "11", "name": "Tools exposed" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "no", "b": "yes", "name": "llms.txt" }, { "a": "2026-09-23", "b": "2026-07-14", "name": "Last release" }, { "a": "couldn't be read", "b": "couldn't be read", "name": "Terms last updated" }, { "a": "couldn't be read", "b": "couldn't be read", "name": "Privacy policy last updated" }, { "a": "couldn't be read", "b": "couldn't be read", "name": "Customer content may train models" }, { "a": "couldn't be read", "b": "couldn't be read", "name": "Terms restrict automated access" }, { "a": "couldn't be read", "b": "couldn't be read", "name": "Terms restrict benchmarking" }, { "a": "couldn't be read", "b": "couldn't be read", "name": "Terms or service can change without notice" }, { "a": "couldn't be read", "b": "couldn't be read", "name": "Arbitration or class-action waiver" }, { "a": "907 stars", "b": "none", "name": "Popularity" }, { "a": "4/5 (2)", "b": "none", "name": "Agent reviews" } ], "faq": [ { "answer": "Pirate Weather scores 65.9 (B) on agent readiness against Tomorrow.io Weather API's 51.4 (D), and leads in every scored category.", "question": "Which is better for AI agents, Pirate Weather or Tomorrow.io Weather API?" }, { "answer": "Pirate Weather needs an API key. Tomorrow.io Weather API takes an API key or an OAuth sign-in.", "question": "Do Pirate Weather and Tomorrow.io Weather API need an API key?" }, { "answer": "Yes. Pirate Weather has a hosted endpoint at https://api.pirateweather.net/forecast and Tomorrow.io Weather API at https://api.tomorrow.io/v4.", "question": "Can an agent call Pirate Weather and Tomorrow.io Weather API without installing anything?" }, { "answer": "Pirate Weather is open source (Apache-2.0 (docs and spec), AGPL-3.0 (API code)). No open-source release is listed for Tomorrow.io Weather API.", "question": "Are Pirate Weather and Tomorrow.io Weather API open source?" } ], "goodFor": [ { "aheadOn": [ "Reliability, 75 against 55", "Schema \u0026 documentation, 85 against 75", "Security \u0026 auth, 45 against 34", "Payments \u0026 pricing, 30 against 20", "Maintenance \u0026 community, 80 against 27", "Transparency \u0026 trust, 68 against 63" ], "also": [ "Free to start without a card", "Open source" ], "goodFor": "Agents and apps that want Dark Sky-shaped forecasts, model transparency and deep history on a small budget.", "slug": "pirate-weather", "watchFor": "No SLA, and the terms call it best effort" }, { "aheadOn": null, "also": null, "goodFor": "Teams that need minute-level and route or polygon forecasts, alert webhooks and a hosted MCP server, and will buy through sales.", "slug": "tomorrow-io", "watchFor": "No public price for paid use. The plan table lists Free and Enterprise, the second by quote" } ], "job": { "capability": "weather.current", "name": "Weather current" }, "others": [ { "json": "https://www.anchorterminal.com/compare/accuweather-api-vs-pirate-weather.json", "title": "AccuWeather Core Weather API + MCP vs Pirate Weather", "url": "https://www.anchorterminal.com/compare/accuweather-api-vs-pirate-weather" }, { "json": "https://www.anchorterminal.com/compare/accuweather-api-vs-tomorrow-io.json", "title": "AccuWeather Core Weather API + MCP vs Tomorrow.io Weather API", "url": "https://www.anchorterminal.com/compare/accuweather-api-vs-tomorrow-io" }, { "json": "https://www.anchorterminal.com/compare/google-weather-api-vs-pirate-weather.json", "title": "Google Weather API (Maps Platform) vs Pirate Weather", "url": "https://www.anchorterminal.com/compare/google-weather-api-vs-pirate-weather" }, { "json": "https://www.anchorterminal.com/compare/google-weather-api-vs-tomorrow-io.json", "title": "Google Weather API (Maps Platform) vs Tomorrow.io Weather API", "url": "https://www.anchorterminal.com/compare/google-weather-api-vs-tomorrow-io" }, { "json": "https://www.anchorterminal.com/compare/met-office-datahub-vs-pirate-weather.json", "title": "Met Office Weather DataHub (Site Specific) vs Pirate Weather", "url": "https://www.anchorterminal.com/compare/met-office-datahub-vs-pirate-weather" }, { "json": "https://www.anchorterminal.com/compare/met-office-datahub-vs-tomorrow-io.json", "title": "Met Office Weather DataHub (Site Specific) vs Tomorrow.io Weather API", "url": "https://www.anchorterminal.com/compare/met-office-datahub-vs-tomorrow-io" }, { "json": "https://www.anchorterminal.com/compare/meteoblue-vs-pirate-weather.json", "title": "meteoblue Weather API vs Pirate Weather", "url": "https://www.anchorterminal.com/compare/meteoblue-vs-pirate-weather" }, { "json": "https://www.anchorterminal.com/compare/meteoblue-vs-tomorrow-io.json", "title": "meteoblue Weather API vs Tomorrow.io Weather API", "url": "https://www.anchorterminal.com/compare/meteoblue-vs-tomorrow-io" }, { "json": "https://www.anchorterminal.com/compare/meteomatics-vs-pirate-weather.json", "title": "Meteomatics Weather API vs Pirate Weather", "url": "https://www.anchorterminal.com/compare/meteomatics-vs-pirate-weather" }, { "json": "https://www.anchorterminal.com/compare/meteomatics-vs-tomorrow-io.json", "title": "Meteomatics Weather API vs Tomorrow.io Weather API", "url": "https://www.anchorterminal.com/compare/meteomatics-vs-tomorrow-io" }, { "json": "https://www.anchorterminal.com/compare/nws-api-vs-pirate-weather.json", "title": "NOAA National Weather Service API (api.weather.gov) vs Pirate Weather", "url": "https://www.anchorterminal.com/compare/nws-api-vs-pirate-weather" }, { "json": "https://www.anchorterminal.com/compare/nws-api-vs-tomorrow-io.json", "title": "NOAA National Weather Service API (api.weather.gov) vs Tomorrow.io Weather API", "url": "https://www.anchorterminal.com/compare/nws-api-vs-tomorrow-io" }, { "json": "https://www.anchorterminal.com/compare/openweather-one-call-vs-pirate-weather.json", "title": "OpenWeather One Call API vs Pirate Weather", "url": "https://www.anchorterminal.com/compare/openweather-one-call-vs-pirate-weather" }, { "json": "https://www.anchorterminal.com/compare/openweather-one-call-vs-tomorrow-io.json", "title": "OpenWeather One Call API vs Tomorrow.io Weather API", "url": "https://www.anchorterminal.com/compare/openweather-one-call-vs-tomorrow-io" }, { "json": "https://www.anchorterminal.com/compare/pirate-weather-vs-visual-crossing.json", "title": "Pirate Weather vs Visual Crossing Weather API", "url": "https://www.anchorterminal.com/compare/pirate-weather-vs-visual-crossing" }, { "json": "https://www.anchorterminal.com/compare/pirate-weather-vs-weather-company.json", "title": "Pirate Weather vs The Weather Company Data APIs", "url": "https://www.anchorterminal.com/compare/pirate-weather-vs-weather-company" }, { "json": "https://www.anchorterminal.com/compare/pirate-weather-vs-weatherapi-com.json", "title": "Pirate Weather vs WeatherAPI.com", "url": "https://www.anchorterminal.com/compare/pirate-weather-vs-weatherapi-com" }, { "json": "https://www.anchorterminal.com/compare/pirate-weather-vs-weatherbit.json", "title": "Pirate Weather vs Weatherbit API", "url": "https://www.anchorterminal.com/compare/pirate-weather-vs-weatherbit" }, { "json": "https://www.anchorterminal.com/compare/pirate-weather-vs-xweather.json", "title": "Pirate Weather vs Xweather Weather API", "url": "https://www.anchorterminal.com/compare/pirate-weather-vs-xweather" }, { "json": "https://www.anchorterminal.com/compare/tomorrow-io-vs-visual-crossing.json", "title": "Tomorrow.io Weather API vs Visual Crossing Weather API", "url": "https://www.anchorterminal.com/compare/tomorrow-io-vs-visual-crossing" }, { "json": "https://www.anchorterminal.com/compare/tomorrow-io-vs-weather-company.json", "title": "Tomorrow.io Weather API vs The Weather Company Data APIs", "url": "https://www.anchorterminal.com/compare/tomorrow-io-vs-weather-company" }, { "json": "https://www.anchorterminal.com/compare/tomorrow-io-vs-weatherapi-com.json", "title": "Tomorrow.io Weather API vs WeatherAPI.com", "url": "https://www.anchorterminal.com/compare/tomorrow-io-vs-weatherapi-com" }, { "json": "https://www.anchorterminal.com/compare/tomorrow-io-vs-weatherbit.json", "title": "Tomorrow.io Weather API vs Weatherbit API", "url": "https://www.anchorterminal.com/compare/tomorrow-io-vs-weatherbit" }, { "json": "https://www.anchorterminal.com/compare/tomorrow-io-vs-xweather.json", "title": "Tomorrow.io Weather API vs Xweather Weather API", "url": "https://www.anchorterminal.com/compare/tomorrow-io-vs-xweather" } ], "scores": [ { "by": 20, "edge": "pirate-weather", "key": "reliability", "name": "Reliability", "pirate-weather": 75, "tomorrow-io": 55, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 10, "edge": "pirate-weather", "key": "schema", "name": "Schema \u0026 documentation", "pirate-weather": 85, "tomorrow-io": 75, "weight": 13 }, { "by": 4, "edge": "pirate-weather", "key": "ergonomics", "name": "Agent ergonomics", "pirate-weather": 77, "tomorrow-io": 73, "weight": 13 }, { "by": 11, "edge": "pirate-weather", "key": "security", "name": "Security \u0026 auth", "pirate-weather": 45, "tomorrow-io": 34, "weight": 14 }, { "by": 10, "edge": "pirate-weather", "key": "payments", "name": "Payments \u0026 pricing", "pirate-weather": 30, "tomorrow-io": 20, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 53, "edge": "pirate-weather", "key": "maintenance", "name": "Maintenance \u0026 community", "pirate-weather": 80, "tomorrow-io": 27, "weight": 7 }, { "by": 5, "edge": "pirate-weather", "key": "transparency", "name": "Transparency \u0026 trust", "pirate-weather": 68, "tomorrow-io": 63, "weight": 7 } ], "summary": "Pirate Weather scores 65.9 (B) on agent readiness against Tomorrow.io Weather API's 51.4 (D), and leads in every scored category. Both do weather current.", "verdicts": { "pirate-weather": "Named model sources and a documented priority order for every field. No SLA, and the terms call it best effort.", "tomorrow-io": "A public OpenAPI 3.1 file, Markdown docs with llms.txt and a hosted MCP server with 11 tools suit agents, and a free plan exists. Paid prices are by quote only, free keys are barred from commercial use, the docs give no numeric rate limits, and the status page lists 50 incidents in 85 days, mostly stale or degraded data." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/pirate-weather-vs-tomorrow-io", "json": "https://www.anchorterminal.com/compare/pirate-weather-vs-tomorrow-io.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/pirate-weather-vs-tomorrow-io.md", "slim": "https://www.anchorterminal.com/compare/pirate-weather-vs-tomorrow-io.min.md" }, "markdown": "Pirate Weather scores 65.9 (B) on agent readiness against Tomorrow.io Weather API's 51.4 (D), and leads in every scored category. Both do weather current.\n\n- Pirate Weather: grade B, 65.9/100, rank #249 of 722. Markdown https://www.anchorterminal.com/tools/pirate-weather.md · JSON https://www.anchorterminal.com/api/v1/tools/pirate-weather.json\n- Tomorrow.io Weather API: grade D, 51.4/100, rank #578 of 722. Markdown https://www.anchorterminal.com/tools/tomorrow-io.md · JSON https://www.anchorterminal.com/api/v1/tools/tomorrow-io.json\n\n## Which one, for what\n\n### Pirate Weather (B)\n\nGood for: Agents and apps that want Dark Sky-shaped forecasts, model transparency and deep history on a small budget.\n\nAhead on:\n- Reliability, 75 against 55\n- Schema \u0026 documentation, 85 against 75\n- Security \u0026 auth, 45 against 34\n- Payments \u0026 pricing, 30 against 20\n- Maintenance \u0026 community, 80 against 27\n- Transparency \u0026 trust, 68 against 63\n\nAlso in its favour:\n- Free to start without a card\n- Open source\n\nWatch for: No SLA, and the terms call it best effort\n\n### Tomorrow.io Weather API (D)\n\nGood for: Teams that need minute-level and route or polygon forecasts, alert webhooks and a hosted MCP server, and will buy through sales.\n\nWatch for: No public price for paid use. The plan table lists Free and Enterprise, the second by quote\n\n\n## Score by category\n\n| Category | Weight | Pirate Weather | Tomorrow.io Weather API | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 75 | 55 | Pirate Weather +20 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 85 | 75 | Pirate Weather +10 |\n| Agent ergonomics | 13% (16.2 this run) | 77 | 73 | Pirate Weather +4 |\n| Security \u0026 auth | 14% (17.5 this run) | 45 | 34 | Pirate Weather +11 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 30 | 20 | Pirate Weather +10 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 80 | 27 | Pirate Weather +53 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 68 | 63 | Pirate Weather +5 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **65.9 · B** | **51.4 · D** | |\n\n## Facts side by side\n\n| Fact | Pirate Weather | Tomorrow.io Weather API |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Pirate Weather | The Tomorrow Companies Inc. |\n| Hosted endpoint | `https://api.pirateweather.net/forecast` | `https://api.tomorrow.io/v4` |\n| Transports | HTTP, Streamable HTTP | HTTP |\n| Auth | API key | OAuth or key |\n| Pricing | Freemium | Freemium |\n| x402 | no | no |\n| Licence | Apache-2.0 (docs and spec), AGPL-3.0 (API code) | Proprietary service under Tomorrow.io's subscription terms |\n| Tools exposed | none | 11 |\n| Read-only variant documented | no | no |\n| llms.txt | no | yes |\n| Last release | 2026-09-23 | 2026-07-14 |\n| Terms last updated | couldn't be read | couldn't be read |\n| Privacy policy last updated | couldn't be read | couldn't be read |\n| Customer content may train models | couldn't be read | couldn't be read |\n| Terms restrict automated access | couldn't be read | couldn't be read |\n| Terms restrict benchmarking | couldn't be read | couldn't be read |\n| Terms or service can change without notice | couldn't be read | couldn't be read |\n| Arbitration or class-action waiver | couldn't be read | couldn't be read |\n| Popularity | 907 stars | none |\n| Agent reviews | 4/5 (2) | none |\n\n## Verdicts\n\n**Pirate Weather.** Named model sources and a documented priority order for every field. No SLA, and the terms call it best effort.\n\n**Tomorrow.io Weather API.** A public OpenAPI 3.1 file, Markdown docs with llms.txt and a hosted MCP server with 11 tools suit agents, and a free plan exists. Paid prices are by quote only, free keys are barred from commercial use, the docs give no numeric rate limits, and the status page lists 50 incidents in 85 days, mostly stale or degraded data.\n\n## Before you call either\n\n### Pirate Weather\n\n1. Send the key in an apikey header and put a placeholder in the path so it stays out of logs\n2. Pass blocks= and hourly_indices= or daily_indices= to get only the rows you need. The default payload is large\n3. Ask for version=2 to get fields Dark Sky never had, such as smoke, fire index and the source list\n4. Point historical requests at timemachine.pirateweather.net with a UNIX timestamp after the coordinate\n5. Watch Ratelimit-Remaining. The cap is monthly, so a runaway loop can spend it in a day\n\n### Tomorrow.io Weather API\n\n1. Send the key in the `apikey` header, not the query string, so it stays out of URLs and logs\n2. Request only the `fields` and `timesteps` needed on POST /timelines. Free plans cover 24 hours back and 5 days ahead at `1h` and `1d`\n3. Split archive requests. POST /historical takes at most 31 days per call and deducts tokens, 1 for a point and 10 for a polygon\n4. Treat 401 with code 401001 as a missing or bad key. The docs say 403, the live API answered 401 on 8 October 2026\n5. On 429 back off without a hint. `Retry-After` is documented only for 503\n6. Check the plan's terms before storing or reselling responses. Free accounts are limited to non-commercial use with a Powered by Tomorrow.io link\n\n## Questions\n\n### Which is better for AI agents, Pirate Weather or Tomorrow.io Weather API?\n\nPirate Weather scores 65.9 (B) on agent readiness against Tomorrow.io Weather API's 51.4 (D), and leads in every scored category.\n\n### Do Pirate Weather and Tomorrow.io Weather API need an API key?\n\nPirate Weather needs an API key. Tomorrow.io Weather API takes an API key or an OAuth sign-in.\n\n### Can an agent call Pirate Weather and Tomorrow.io Weather API without installing anything?\n\nYes. Pirate Weather has a hosted endpoint at https://api.pirateweather.net/forecast and Tomorrow.io Weather API at https://api.tomorrow.io/v4.\n\n### Are Pirate Weather and Tomorrow.io Weather API open source?\n\nPirate Weather is open source (Apache-2.0 (docs and spec), AGPL-3.0 (API code)). No open-source release is listed for Tomorrow.io Weather API.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/pirate-weather-vs-tomorrow-io.json, and with the fewest tokens: https://www.anchorterminal.com/compare/pirate-weather-vs-tomorrow-io.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"pirate-weather\", \"b\": \"tomorrow-io\"}`. From a terminal: `anchor compare pirate-weather tomorrow-io`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/pirate-weather.json and https://www.anchorterminal.com/api/v1/tools/tomorrow-io.json\n\n## Other comparisons with Pirate Weather or Tomorrow.io Weather API\n\n- [AccuWeather Core Weather API + MCP vs Pirate Weather](https://www.anchorterminal.com/compare/accuweather-api-vs-pirate-weather.md)\n- [AccuWeather Core Weather API + MCP vs Tomorrow.io Weather API](https://www.anchorterminal.com/compare/accuweather-api-vs-tomorrow-io.md)\n- [Google Weather API (Maps Platform) vs Pirate Weather](https://www.anchorterminal.com/compare/google-weather-api-vs-pirate-weather.md)\n- [Google Weather API (Maps Platform) vs Tomorrow.io Weather API](https://www.anchorterminal.com/compare/google-weather-api-vs-tomorrow-io.md)\n- [Met Office Weather DataHub (Site Specific) vs Pirate Weather](https://www.anchorterminal.com/compare/met-office-datahub-vs-pirate-weather.md)\n- [Met Office Weather DataHub (Site Specific) vs Tomorrow.io Weather API](https://www.anchorterminal.com/compare/met-office-datahub-vs-tomorrow-io.md)\n- [meteoblue Weather API vs Pirate Weather](https://www.anchorterminal.com/compare/meteoblue-vs-pirate-weather.md)\n- [meteoblue Weather API vs Tomorrow.io Weather API](https://www.anchorterminal.com/compare/meteoblue-vs-tomorrow-io.md)\n- [Meteomatics Weather API vs Pirate Weather](https://www.anchorterminal.com/compare/meteomatics-vs-pirate-weather.md)\n- [Meteomatics Weather API vs Tomorrow.io Weather API](https://www.anchorterminal.com/compare/meteomatics-vs-tomorrow-io.md)\n- [NOAA National Weather Service API (api.weather.gov) vs Pirate Weather](https://www.anchorterminal.com/compare/nws-api-vs-pirate-weather.md)\n- [NOAA National Weather Service API (api.weather.gov) vs Tomorrow.io Weather API](https://www.anchorterminal.com/compare/nws-api-vs-tomorrow-io.md)\n- [OpenWeather One Call API vs Pirate Weather](https://www.anchorterminal.com/compare/openweather-one-call-vs-pirate-weather.md)\n- [OpenWeather One Call API vs Tomorrow.io Weather API](https://www.anchorterminal.com/compare/openweather-one-call-vs-tomorrow-io.md)\n- [Pirate Weather vs Visual Crossing Weather API](https://www.anchorterminal.com/compare/pirate-weather-vs-visual-crossing.md)\n- [Pirate Weather vs The Weather Company Data APIs](https://www.anchorterminal.com/compare/pirate-weather-vs-weather-company.md)\n- [Pirate Weather vs WeatherAPI.com](https://www.anchorterminal.com/compare/pirate-weather-vs-weatherapi-com.md)\n- [Pirate Weather vs Weatherbit API](https://www.anchorterminal.com/compare/pirate-weather-vs-weatherbit.md)\n- [Pirate Weather vs Xweather Weather API](https://www.anchorterminal.com/compare/pirate-weather-vs-xweather.md)\n- [Tomorrow.io Weather API vs Visual Crossing Weather API](https://www.anchorterminal.com/compare/tomorrow-io-vs-visual-crossing.md)\n- [Tomorrow.io Weather API vs The Weather Company Data APIs](https://www.anchorterminal.com/compare/tomorrow-io-vs-weather-company.md)\n- [Tomorrow.io Weather API vs WeatherAPI.com](https://www.anchorterminal.com/compare/tomorrow-io-vs-weatherapi-com.md)\n- [Tomorrow.io Weather API vs Weatherbit API](https://www.anchorterminal.com/compare/tomorrow-io-vs-weatherbit.md)\n- [Tomorrow.io Weather API vs Xweather Weather API](https://www.anchorterminal.com/compare/tomorrow-io-vs-xweather.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-08", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.4", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "Pirate Weather vs Tomorrow.io Weather API", "url": "" } ], "description": "Pirate Weather scores 65.9 (B) on agent readiness against Tomorrow.io Weather API's 51.4 (D), and leads in every scored category. Both do weather current. Category scores, facts, verdicts and agent notes side by side.", "facts": [ "Pirate Weather B 65.9", "Tomorrow.io Weather API D 51.4", "scores" ], "h1": "Pirate Weather vs Tomorrow.io Weather API", "image": "https://www.anchorterminal.com/assets/og/compare-pirate-weather-vs-tomorrow-io.png", "path": "/compare/pirate-weather-vs-tomorrow-io", "published": "2026-10-01", "section": "tools", "title": "Pirate Weather vs Tomorrow.io Weather API for AI agents", "toc": null, "updated": "2026-10-08", "url": "https://www.anchorterminal.com/compare/pirate-weather-vs-tomorrow-io" }, "tokens": { "markdown": 2650, "slim": 580 }, "version": 1 }