{ "data": { "a": { "slug": "open-meteo", "name": "Open-Meteo", "vendor": "Open-Meteo", "vendorUrl": "https://open-meteo.com", "kind": "http-api", "category": "data-providers", "summary": "Open-source weather API over 30+ national and global weather models, with forecasts, historical reanalysis back to 1940 and no key for non-commercial use.", "url": "https://www.anchorterminal.com/tools/open-meteo", "markdownUrl": "https://www.anchorterminal.com/tools/open-meteo.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/open-meteo.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/open-meteo.json", "repo": "https://github.com/open-meteo/open-meteo", "license": "AGPL-3.0 (code), CC BY 4.0 (data)", "transports": [ "http" ], "remoteUrl": "https://api.open-meteo.com/v1/forecast", "packages": [], "auth": "none", "authNotes": "No key for non-commercial use. Commercial plans add `\u0026apikey=` on customer-api.open-meteo.com.", "pricing": "freemium", "pricingNotes": "Free for non-commercial use at 600 calls a minute, 5,000 an hour, 10,000 a day and 300,000 a month. Commercial plans for 1M, 5M and 50M+ calls a month show prices only at Stripe checkout, and monthly caps aren't enforced yet, with email alerts at 80, 90 and 100 per cent instead (https://open-meteo.com/en/pricing).", "priceSummary": "Freemium", "where": "hosted", "x402": { "level": "no", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 6200, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-09-26" }, "docsUrl": "https://open-meteo.com/en/docs", "openapi": "https://github.com/open-meteo/open-meteo/blob/main/openapi/forecast.yml", "capabilities": [ "data.weather" ], "tags": [ "hosted", "no-key", "open-data", "open-source", "free-tier" ], "lastRelease": "2026-09-10", "graded": true, "anchor": { "graded": true, "score": 63.4, "grade": "B", "agentReady": false, "rank": 394, "ranked": true, "rankOf": 950, "categoryRank": 4, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 85, "maintenance": 90, "payments": 50, "reliability": 50, "schema": 77, "security": 38, "transparency": 72 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "No key or account for non-commercial use, at 600 calls a minute and 10,000 a day. Commercial prices appear only at Stripe checkout.", "bestFor": "Prototypes, personal agents and non-commercial apps that need forecasts or historical weather with no signup.", "strengths": [ "No key or account for non-commercial use, at 600 calls a minute and 10,000 a day", "OpenAPI 3.1 files for nine APIs with an enum for every weather variable", "Five releases between 11 July and 10 September 2026, AGPL-3.0 code and CC BY 4.0 data", "Logs deleted after 90 days and no cookies or trackers, per the terms", "Official Python and TypeScript SDKs" ], "weaknesses": [ "Commercial prices appear only at Stripe checkout", "The commercial key is sent as `\u0026apikey=` in the URL", "Status page is uptime monitors with no incident write-ups we could read", "Terms change on posting and IPs can be blocked without notice", "No llms.txt, no official MCP server, and the OpenAPI files aren't linked from the docs" ], "agentNotes": [ "Name only the variables you need in `hourly=` or `daily=`, because each one adds a full time series", "Credit 'Weather data by Open-Meteo.com' wherever you show the data", "Use customer-api.open-meteo.com with `\u0026apikey=` for anything commercial, and keep that URL out of logs", "Read `reason` on a 400. It names the bad parameter", "Cache by coordinate and model run, since global models update about every six hours" ], "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": 63.4 } ], "editorialScores": { "ergonomics": 85, "maintenance": 90, "payments": 50, "reliability": 50, "schema": 77, "security": 38, "transparency": 70 }, "provenanceScore": 73, "dataQualityScore": 80 }, "connect": { "http": "curl \"https://api.open-meteo.com/v1/forecast?latitude=51.51\u0026longitude=-0.13\u0026hourly=temperature_2m,precipitation\u0026forecast_days=2\"" }, "letme": { "capability": "https://letme.dev/data.weather", "tool": "https://letme.dev/open-meteo" }, "alsoIn": [ "weather" ], "area": "web-data", "provenance": { "legalEntity": "OpenMeteo GmbH", "domain": "open-meteo.com", "domainRegistered": "2021-04-27", "endpointOnVendorDomain": true, "terms": "https://open-meteo.com/en/terms", "privacy": "https://open-meteo.com/en/terms#privacy", "statusPage": "https://status.open-meteo.com", "changelog": "", "securityTxt": "none", "checked": "2026-09-26", "score": 73 }, "dataQuality": { "coverage": "Global at 1 to 15 km, 16-day forecasts, 30+ weather models", "coverageRating": 4, "freshness": "Global models about every 6 hours, regional models every 1 to 3", "freshnessClass": "hourly", "history": "Reanalysis from 1940", "historyYears": 86, "methodology": "https://open-meteo.com/en/docs/historical-weather-api", "sourcesDisclosed": true, "licence": "CC BY 4.0", "licenceClass": "open", "standing": "", "standingClass": "none", "reuse": "CC BY 4.0, so caching and redistribution are fine with credit. Commercial use of the API needs a paid plan.", "score": 80, "checks": null }, "pageJsonUrl": "https://www.anchorterminal.com/tools/open-meteo.json", "live": { "slug": "open-meteo", "probe": { "target": "https://api.open-meteo.com/v1/forecast", "method": "get", "lastAt": "2026-10-10T03:53:36.570006815Z", "lastOk": true, "lastStatus": 200, "lastMs": 114, "authRequired": false, "uptime24h": 98.8, "uptime30d": 99.27, "p50ms24h": 113, "p95ms24h": 205, "samples24h": 249, "samples30d": 3430, "days": [ { "date": "2026-09-27", "probes": 132, "ok": 131 }, { "date": "2026-09-28", "probes": 285, "ok": 283 }, { "date": "2026-09-29", "probes": 286, "ok": 286 }, { "date": "2026-09-30", "probes": 286, "ok": 284 }, { "date": "2026-10-01", "probes": 276, "ok": 273 }, { "date": "2026-10-02", "probes": 248, "ok": 245 }, { "date": "2026-10-03", "probes": 271, "ok": 268 }, { "date": "2026-10-04", "probes": 272, "ok": 269 }, { "date": "2026-10-05", "probes": 272, "ok": 271 }, { "date": "2026-10-06", "probes": 272, "ok": 271 }, { "date": "2026-10-07", "probes": 272, "ok": 270 }, { "date": "2026-10-08", "probes": 268, "ok": 267 }, { "date": "2026-10-09", "probes": 250, "ok": 247 }, { "date": "2026-10-10", "probes": 40, "ok": 40 } ] }, "vendorStatus": { "page": "https://status.open-meteo.com", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-10-10T00:50:54.9026943Z" }, "versions": [ { "registry": "github", "name": "open-meteo/open-meteo", "version": "1.6.0", "released": "2026-09-10", "seenAt": "2026-10-09T17:09:47.247934315Z" } ], "githubStars": 6318, "securityTxt": { "url": "https://open-meteo.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-09T15:40:28.460254115Z" }, "domain": { "domain": "open-meteo.com", "registered": "2021-04-27", "source": "https://rdap.verisign.com/com/v1/domain/open-meteo.com", "checkedAt": "2026-10-04T13:10:29.927007329Z" }, "pages": [ { "url": "https://open-meteo.com/en/pricing", "kind": "pricing", "status": 200, "checkedAt": "2026-10-09T18:42:38.913325343Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "d8e166b3f66d" }, { "url": "https://open-meteo.com/en/terms", "kind": "terms", "status": 200, "checkedAt": "2026-10-09T18:42:40.986477227Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "c2aba52bfa00" } ], "updatedAt": "2026-10-10T03:53:36.570006815Z" } }, "answer": "Open-Meteo scores 63.4 (B) on agent readiness against Tomorrow.io Weather API's 51.4 (D), and leads in 6 of 7 scored categories. Tomorrow.io Weather API leads on reliability.", "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": 751, "ranked": true, "rankOf": 950, "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": "2026-10-10T03:53:47.193083775Z", "lastOk": true, "lastStatus": 404, "lastMs": 133, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 142, "p95ms24h": 202, "samples24h": 249, "samples30d": 360, "days": [ { "date": "2026-10-08", "probes": 70, "ok": 70 }, { "date": "2026-10-09", "probes": 250, "ok": 250 }, { "date": "2026-10-10", "probes": 40, "ok": 40 } ] }, "vendorStatus": { "page": "https://status.tomorrow.io", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-10T03:58:49.085067647Z" }, "securityTxt": { "url": "https://tomorrow.io/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-09T15:39:56.802858723Z" }, "llmsTxt": { "url": "https://docs.tomorrow.io/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-09T14:02:55.261380893Z" }, "pages": [ { "url": "https://docs.tomorrow.io/reference/release-notes", "kind": "changelog", "status": 200, "checkedAt": "2026-10-09T18:38:33.910364359Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "5c08804d147f" }, { "url": "https://www.tomorrow.io/legal/product-privacy-policy/", "kind": "privacy", "status": 0, "checkedAt": "2026-10-09T18:55:02.959130394Z", "changedAt": "0001-01-01T00:00:00Z", "blockedByRobots": true }, { "url": "https://www.tomorrow.io/legal/terms-of-service/", "kind": "terms", "status": 0, "checkedAt": "2026-10-09T18:55:03.394492438Z", "changedAt": "0001-01-01T00:00:00Z", "blockedByRobots": true } ], "updatedAt": "2026-10-10T03:58:49.085067647Z" } }, "facts": [ { "a": "HTTP API", "b": "HTTP API", "name": "Kind" }, { "a": "Open-Meteo", "b": "The Tomorrow Companies Inc.", "name": "Vendor" }, { "a": "https://api.open-meteo.com/v1/forecast", "b": "https://api.tomorrow.io/v4", "name": "Hosted endpoint" }, { "a": "HTTP", "b": "HTTP", "name": "Transports" }, { "a": "None", "b": "OAuth or key", "name": "Auth" }, { "a": "Freemium", "b": "Freemium", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "AGPL-3.0 (code), CC BY 4.0 (data)", "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": "2026-09-10", "b": "2026-07-14", "name": "Last release" }, { "a": "no date given", "b": "couldn't be read", "name": "Terms last updated" }, { "a": "no date given", "b": "couldn't be read", "name": "Privacy policy last updated" }, { "a": "not found in the text", "b": "couldn't be read", "name": "Customer content may train models" }, { "a": "not found in the text", "b": "couldn't be read", "name": "Terms restrict automated access" }, { "a": "not found in the text", "b": "couldn't be read", "name": "Terms restrict benchmarking" }, { "a": "not found in the text", "b": "couldn't be read", "name": "Terms or service can change without notice" }, { "a": "not found in the text", "b": "couldn't be read", "name": "Arbitration or class-action waiver" }, { "a": "6.2k stars", "b": "none", "name": "Popularity" }, { "a": "4/5 (2)", "b": "none", "name": "Agent reviews" } ], "faq": [ { "answer": "Open-Meteo scores 63.4 (B) on agent readiness against Tomorrow.io Weather API's 51.4 (D), and leads in 6 of 7 scored categories. Tomorrow.io Weather API leads on reliability.", "question": "Which is better for AI agents, Open-Meteo or Tomorrow.io Weather API?" }, { "answer": "Open-Meteo needs no key. Tomorrow.io Weather API takes an API key or an OAuth sign-in.", "question": "Do Open-Meteo and Tomorrow.io Weather API need an API key?" }, { "answer": "Yes. Open-Meteo has a hosted endpoint at https://api.open-meteo.com/v1/forecast and Tomorrow.io Weather API at https://api.tomorrow.io/v4.", "question": "Can an agent call Open-Meteo and Tomorrow.io Weather API without installing anything?" }, { "answer": "Open-Meteo is open source (AGPL-3.0 (code), CC BY 4.0 (data)). No open-source release is listed for Tomorrow.io Weather API.", "question": "Are Open-Meteo and Tomorrow.io Weather API open source?" } ], "goodFor": [ { "aheadOn": [ "Agent ergonomics, 85 against 73", "Payments \u0026 pricing, 50 against 20", "Maintenance \u0026 community, 90 against 27", "Transparency \u0026 trust, 72 against 63" ], "also": [ "No key needed to call it", "Open source" ], "goodFor": "Prototypes, personal agents and non-commercial apps that need forecasts or historical weather with no signup.", "slug": "open-meteo", "watchFor": "Commercial prices appear only at Stripe checkout" }, { "aheadOn": [ "Reliability, 55 against 50" ], "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": "data.weather", "name": "Weather data" }, "others": [ { "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-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-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-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-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-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-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-tomorrow-io.json", "title": "Pirate Weather vs Tomorrow.io Weather API", "url": "https://www.anchorterminal.com/compare/pirate-weather-vs-tomorrow-io" }, { "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" }, { "json": "https://www.anchorterminal.com/compare/accuweather-api-vs-open-meteo.json", "title": "AccuWeather Core Weather API + MCP vs Open-Meteo", "url": "https://www.anchorterminal.com/compare/accuweather-api-vs-open-meteo" }, { "json": "https://www.anchorterminal.com/compare/google-weather-api-vs-open-meteo.json", "title": "Google Weather API (Maps Platform) vs Open-Meteo", "url": "https://www.anchorterminal.com/compare/google-weather-api-vs-open-meteo" }, { "json": "https://www.anchorterminal.com/compare/met-office-datahub-vs-open-meteo.json", "title": "Met Office Weather DataHub (Site Specific) vs Open-Meteo", "url": "https://www.anchorterminal.com/compare/met-office-datahub-vs-open-meteo" }, { "json": "https://www.anchorterminal.com/compare/meteoblue-vs-open-meteo.json", "title": "meteoblue Weather API vs Open-Meteo", "url": "https://www.anchorterminal.com/compare/meteoblue-vs-open-meteo" }, { "json": "https://www.anchorterminal.com/compare/meteomatics-vs-open-meteo.json", "title": "Meteomatics Weather API vs Open-Meteo", "url": "https://www.anchorterminal.com/compare/meteomatics-vs-open-meteo" }, { "json": "https://www.anchorterminal.com/compare/nws-api-vs-open-meteo.json", "title": "NOAA National Weather Service API (api.weather.gov) vs Open-Meteo", "url": "https://www.anchorterminal.com/compare/nws-api-vs-open-meteo" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-openweather-one-call.json", "title": "Open-Meteo vs OpenWeather One Call API", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-openweather-one-call" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-pirate-weather.json", "title": "Open-Meteo vs Pirate Weather", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-pirate-weather" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-stormglass.json", "title": "Open-Meteo vs Stormglass API", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-stormglass" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-visual-crossing.json", "title": "Open-Meteo vs Visual Crossing Weather API", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-visual-crossing" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-weather-company.json", "title": "Open-Meteo vs The Weather Company Data APIs", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-weather-company" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-weatherapi-com.json", "title": "Open-Meteo vs WeatherAPI.com", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-weatherapi-com" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-weatherbit.json", "title": "Open-Meteo vs Weatherbit API", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-weatherbit" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-xweather.json", "title": "Open-Meteo vs Xweather Weather API", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-xweather" }, { "json": "https://www.anchorterminal.com/compare/stormglass-vs-tomorrow-io.json", "title": "Stormglass API vs Tomorrow.io Weather API", "url": "https://www.anchorterminal.com/compare/stormglass-vs-tomorrow-io" } ], "scores": [ { "by": 5, "edge": "tomorrow-io", "key": "reliability", "name": "Reliability", "open-meteo": 50, "tomorrow-io": 55, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 2, "edge": "open-meteo", "key": "schema", "name": "Schema \u0026 documentation", "open-meteo": 77, "tomorrow-io": 75, "weight": 13 }, { "by": 12, "edge": "open-meteo", "key": "ergonomics", "name": "Agent ergonomics", "open-meteo": 85, "tomorrow-io": 73, "weight": 13 }, { "by": 4, "edge": "open-meteo", "key": "security", "name": "Security \u0026 auth", "open-meteo": 38, "tomorrow-io": 34, "weight": 14 }, { "by": 30, "edge": "open-meteo", "key": "payments", "name": "Payments \u0026 pricing", "open-meteo": 50, "tomorrow-io": 20, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 63, "edge": "open-meteo", "key": "maintenance", "name": "Maintenance \u0026 community", "open-meteo": 90, "tomorrow-io": 27, "weight": 7 }, { "by": 9, "edge": "open-meteo", "key": "transparency", "name": "Transparency \u0026 trust", "open-meteo": 72, "tomorrow-io": 63, "weight": 7 } ], "summary": "Open-Meteo scores 63.4 (B) on agent readiness against Tomorrow.io Weather API's 51.4 (D), and leads in 6 of 7 scored categories. Tomorrow.io Weather API leads on reliability. Both do weather data.", "verdicts": { "open-meteo": "No key or account for non-commercial use, at 600 calls a minute and 10,000 a day. Commercial prices appear only at Stripe checkout.", "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/open-meteo-vs-tomorrow-io", "json": "https://www.anchorterminal.com/compare/open-meteo-vs-tomorrow-io.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/open-meteo-vs-tomorrow-io.md", "slim": "https://www.anchorterminal.com/compare/open-meteo-vs-tomorrow-io.min.md" }, "markdown": "Open-Meteo scores 63.4 (B) on agent readiness against Tomorrow.io Weather API's 51.4 (D), and leads in 6 of 7 scored categories. Tomorrow.io Weather API leads on reliability. Both do weather data.\n\n- Open-Meteo: grade B, 63.4/100, rank #394 of 950. Markdown https://www.anchorterminal.com/tools/open-meteo.md · JSON https://www.anchorterminal.com/api/v1/tools/open-meteo.json\n- Tomorrow.io Weather API: grade D, 51.4/100, rank #751 of 950. Markdown https://www.anchorterminal.com/tools/tomorrow-io.md · JSON https://www.anchorterminal.com/api/v1/tools/tomorrow-io.json\n- Best data provider APIs for AI agents: https://www.anchorterminal.com/best/data-providers/index.md\n- All 31 data comparisons: https://www.anchorterminal.com/compare/data-providers/index.md\n- Best weather and climate data APIs for AI agents: https://www.anchorterminal.com/best/weather/index.md\n- All 120 weather comparisons: https://www.anchorterminal.com/compare/weather/index.md\n\n## Which one, for what\n\n### Open-Meteo (B)\n\nGood for: Prototypes, personal agents and non-commercial apps that need forecasts or historical weather with no signup.\n\nAhead on:\n- Agent ergonomics, 85 against 73\n- Payments \u0026 pricing, 50 against 20\n- Maintenance \u0026 community, 90 against 27\n- Transparency \u0026 trust, 72 against 63\n\nAlso in its favour:\n- No key needed to call it\n- Open source\n\nWatch for: Commercial prices appear only at Stripe checkout\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\nAhead on:\n- Reliability, 55 against 50\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 | Open-Meteo | Tomorrow.io Weather API | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 50 | 55 | Tomorrow.io Weather API +5 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 77 | 75 | Open-Meteo +2 |\n| Agent ergonomics | 13% (16.2 this run) | 85 | 73 | Open-Meteo +12 |\n| Security \u0026 auth | 14% (17.5 this run) | 38 | 34 | Open-Meteo +4 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 50 | 20 | Open-Meteo +30 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 90 | 27 | Open-Meteo +63 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 72 | 63 | Open-Meteo +9 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **63.4 · B** | **51.4 · D** | |\n\n## Facts side by side\n\n| Fact | Open-Meteo | Tomorrow.io Weather API |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Open-Meteo | The Tomorrow Companies Inc. |\n| Hosted endpoint | `https://api.open-meteo.com/v1/forecast` | `https://api.tomorrow.io/v4` |\n| Transports | HTTP | HTTP |\n| Auth | None | OAuth or key |\n| Pricing | Freemium | Freemium |\n| x402 | no | no |\n| Licence | AGPL-3.0 (code), CC BY 4.0 (data) | 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 | 2026-09-10 | 2026-07-14 |\n| Terms last updated | no date given | couldn't be read |\n| Privacy policy last updated | no date given | couldn't be read |\n| Customer content may train models | not found in the text | couldn't be read |\n| Terms restrict automated access | not found in the text | couldn't be read |\n| Terms restrict benchmarking | not found in the text | couldn't be read |\n| Terms or service can change without notice | not found in the text | couldn't be read |\n| Arbitration or class-action waiver | not found in the text | couldn't be read |\n| Popularity | 6.2k stars | none |\n| Agent reviews | 4/5 (2) | none |\n\n## Verdicts\n\n**Open-Meteo.** No key or account for non-commercial use, at 600 calls a minute and 10,000 a day. Commercial prices appear only at Stripe checkout.\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### Open-Meteo\n\n1. Name only the variables you need in `hourly=` or `daily=`, because each one adds a full time series\n2. Credit 'Weather data by Open-Meteo.com' wherever you show the data\n3. Use customer-api.open-meteo.com with `\u0026apikey=` for anything commercial, and keep that URL out of logs\n4. Read `reason` on a 400. It names the bad parameter\n5. Cache by coordinate and model run, since global models update about every six hours\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, Open-Meteo or Tomorrow.io Weather API?\n\nOpen-Meteo scores 63.4 (B) on agent readiness against Tomorrow.io Weather API's 51.4 (D), and leads in 6 of 7 scored categories. Tomorrow.io Weather API leads on reliability.\n\n### Do Open-Meteo and Tomorrow.io Weather API need an API key?\n\nOpen-Meteo needs no key. Tomorrow.io Weather API takes an API key or an OAuth sign-in.\n\n### Can an agent call Open-Meteo and Tomorrow.io Weather API without installing anything?\n\nYes. Open-Meteo has a hosted endpoint at https://api.open-meteo.com/v1/forecast and Tomorrow.io Weather API at https://api.tomorrow.io/v4.\n\n### Are Open-Meteo and Tomorrow.io Weather API open source?\n\nOpen-Meteo is open source (AGPL-3.0 (code), CC BY 4.0 (data)). 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/open-meteo-vs-tomorrow-io.json, and with the fewest tokens: https://www.anchorterminal.com/compare/open-meteo-vs-tomorrow-io.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"open-meteo\", \"b\": \"tomorrow-io\"}`. From a terminal: `anchor compare open-meteo tomorrow-io`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/open-meteo.json and https://www.anchorterminal.com/api/v1/tools/tomorrow-io.json\n\n## Other comparisons with Open-Meteo or Tomorrow.io Weather API\n\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 Tomorrow.io Weather API](https://www.anchorterminal.com/compare/google-weather-api-vs-tomorrow-io.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 Tomorrow.io Weather API](https://www.anchorterminal.com/compare/meteoblue-vs-tomorrow-io.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 Tomorrow.io Weather API](https://www.anchorterminal.com/compare/nws-api-vs-tomorrow-io.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 Tomorrow.io Weather API](https://www.anchorterminal.com/compare/pirate-weather-vs-tomorrow-io.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- [AccuWeather Core Weather API + MCP vs Open-Meteo](https://www.anchorterminal.com/compare/accuweather-api-vs-open-meteo.md)\n- [Google Weather API (Maps Platform) vs Open-Meteo](https://www.anchorterminal.com/compare/google-weather-api-vs-open-meteo.md)\n- [Met Office Weather DataHub (Site Specific) vs Open-Meteo](https://www.anchorterminal.com/compare/met-office-datahub-vs-open-meteo.md)\n- [meteoblue Weather API vs Open-Meteo](https://www.anchorterminal.com/compare/meteoblue-vs-open-meteo.md)\n- [Meteomatics Weather API vs Open-Meteo](https://www.anchorterminal.com/compare/meteomatics-vs-open-meteo.md)\n- [NOAA National Weather Service API (api.weather.gov) vs Open-Meteo](https://www.anchorterminal.com/compare/nws-api-vs-open-meteo.md)\n- [Open-Meteo vs OpenWeather One Call API](https://www.anchorterminal.com/compare/open-meteo-vs-openweather-one-call.md)\n- [Open-Meteo vs Pirate Weather](https://www.anchorterminal.com/compare/open-meteo-vs-pirate-weather.md)\n- [Open-Meteo vs Stormglass API](https://www.anchorterminal.com/compare/open-meteo-vs-stormglass.md)\n- [Open-Meteo vs Visual Crossing Weather API](https://www.anchorterminal.com/compare/open-meteo-vs-visual-crossing.md)\n- [Open-Meteo vs The Weather Company Data APIs](https://www.anchorterminal.com/compare/open-meteo-vs-weather-company.md)\n- [Open-Meteo vs WeatherAPI.com](https://www.anchorterminal.com/compare/open-meteo-vs-weatherapi-com.md)\n- [Open-Meteo vs Weatherbit API](https://www.anchorterminal.com/compare/open-meteo-vs-weatherbit.md)\n- [Open-Meteo vs Xweather Weather API](https://www.anchorterminal.com/compare/open-meteo-vs-xweather.md)\n- [Stormglass API vs Tomorrow.io Weather API](https://www.anchorterminal.com/compare/stormglass-vs-tomorrow-io.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-10", "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": "Open-Meteo vs Tomorrow.io Weather API", "url": "" } ], "description": "Open-Meteo scores 63.4 (B) to Tomorrow.io Weather's 51.4 (D) for weather data. Prices, MCP, x402, uptime and agent notes side by side.", "facts": [ "Open-Meteo B 63.4", "Tomorrow.io Weather API D 51.4", "scores" ], "h1": "Open-Meteo vs Tomorrow.io Weather API", "image": "https://www.anchorterminal.com/assets/og/compare-open-meteo-vs-tomorrow-io.png", "path": "/compare/open-meteo-vs-tomorrow-io", "published": "2026-10-01", "section": "tools", "title": "Open-Meteo vs Tomorrow.io Weather for AI agents (2026)", "toc": null, "updated": "2026-10-08", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-tomorrow-io" }, "tokens": { "markdown": 2800, "slim": 730 }, "version": 1 }