{ "data": { "a": { "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": 504, "ranked": true, "rankOf": 629, "categoryRank": 7, "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": "2026-10-08T19:09:00.549742716Z", "lastOk": true, "lastStatus": 404, "lastMs": 187, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 156, "p95ms24h": 187, "samples24h": 19, "samples30d": 19, "days": [ { "date": "2026-10-08", "probes": 19, "ok": 19 } ] }, "vendorStatus": { "page": "https://status.tomorrow.io", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-08T19:07:01.865665571Z" }, "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": "2026-10-08T19:09:00.549742716Z" } }, "answer": "WeatherAPI.com scores 65.3 (B) on agent readiness against Tomorrow.io Weather API's 51.4 (D), and leads in every scored category.", "b": { "slug": "weatherapi-com", "name": "WeatherAPI.com", "vendor": "WeatherAPI.com (Zoomash Ltd)", "vendorUrl": "https://www.weatherapi.com", "kind": "http-api", "category": "weather", "summary": "Weather API for current conditions, forecasts, history, marine data, alerts and air quality, queried by location.", "url": "https://www.anchorterminal.com/tools/weatherapi-com", "markdownUrl": "https://www.anchorterminal.com/tools/weatherapi-com.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/weatherapi-com.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/weatherapi-com.json", "transports": [ "http" ], "remoteUrl": "https://api.weatherapi.com/v1", "packages": [], "auth": "api-key", "authNotes": "The key goes in the key query parameter on every request. The terms tie one key to one application.", "pricing": "freemium", "pricingNotes": "Free at 100,000 calls a month with a 3-day forecast and 1 day of history, no card. Starter $7 a month ($75 a year) for 3 million calls, 7-day forecast and 7 days of history. Pro+ $25 ($270 a year) for 5 million calls, 14-day forecast, 365 days of history, marine with tides and bulk requests. Business $65 ($702 a year) for 10 million calls, history back to 2010-01-01 and 99.9 per cent uptime. Enterprise on request with unlimited calls. Paid plans start with a 14-day free trial (https://www.weatherapi.com/pricing.aspx).", "priceSummary": "$7 / mo", "where": "hosted", "x402": { "level": "no", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-09-30" }, "docsUrl": "https://www.weatherapi.com/docs/", "llmsTxt": "https://www.weatherapi.com/llms.txt", "openapi": "https://www.weatherapi.com/openapi.json", "capabilities": [ "weather.current", "weather.forecast", "weather.historical", "weather.alerts", "weather.marine", "data.weather" ], "tags": [ "hosted", "freemium", "free-tier", "no-card", "closed-source", "uk" ], "graded": true, "anchor": { "graded": true, "score": 65.3, "grade": "B", "agentReady": false, "rank": 237, "ranked": true, "rankOf": 629, "categoryRank": 3, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 80, "maintenance": 45, "payments": 30, "reliability": 90, "schema": 89, "security": 37, "transparency": 65 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "3 million calls for $7 a month, and 100,000 a month free with no card. Key only in the query string, and no security.txt.", "bestFor": "Cheap, high-volume consumer forecasts where the location arrives as a city, postcode or IP.", "strengths": [ "3 million calls for $7 a month, and 100,000 a month free with no card", "OpenAPI 3.1 spec with structured errors, plus llms.txt", "Field filters (current_fields, day_fields, hour_fields) to trim responses", "Status page with no incidents listed, and 99.9 per cent with service credits for High Volume customers", "12 months' written notice before an API deprecation, in the terms" ], "weaknesses": [ "Key only in the query string, and no security.txt", "Privacy policy undated, with template placeholders and transfers to Russia and China", "SDKs for Node.js, Java, PHP and Go untouched since 2020 and 2021", "No full list of data sources or models", "Caching limited to 60 minutes for current and 24 hours for forecast" ], "agentNotes": [ "Pass current_fields, day_fields or hour_fields to cut the response to what you need", "Treat a 403 with error code 2007 as the monthly quota, not a bad key. There's no 429", "Reuse the id from search.json (q=id:NNN) to avoid ambiguous city names", "Cache history freely, current for under an hour and forecasts for under a day, to stay inside the terms", "Use https://api.weatherapi.com/v1. The docs still show an http:// base URL" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3.5, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "B", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 65.3 } ], "editorialScores": { "ergonomics": 80, "maintenance": 45, "payments": 30, "reliability": 90, "schema": 89, "security": 37, "transparency": 49 }, "provenanceScore": 81, "dataQualityScore": 49 }, "connect": { "http": "curl \"https://api.weatherapi.com/v1/forecast.json?key=$WEATHERAPI_KEY\u0026q=51.51,-0.13\u0026days=3\u0026aqi=no\u0026alerts=no\"" }, "letme": { "capability": "https://letme.dev/weather.current", "tool": "https://letme.dev/weatherapi-com" }, "area": "domain-data", "unitPrices": [ { "item": "Starter plan", "unit": "month", "usd": 7, "note": "3 million calls, $75 a year" }, { "item": "Pro+ plan", "unit": "month", "usd": 25, "note": "5 million calls, $270 a year" }, { "item": "Business plan", "unit": "month", "usd": 65, "note": "10 million calls, $702 a year" }, { "item": "Call on Starter, at the plan cap", "unit": "1k-requests", "usd": 0.0023, "note": "$7 over 3 million calls" }, { "item": "Call on Business, at the plan cap", "unit": "1k-requests", "usd": 0.0065, "note": "$65 over 10 million calls" } ], "provenance": { "legalEntity": "Zoomash Ltd", "domain": "weatherapi.com", "domainRegistered": "2014-11-29", "endpointOnVendorDomain": true, "terms": "https://www.weatherapi.com/terms.aspx", "privacy": "https://www.weatherapi.com/privacy.aspx", "statusPage": "https://status.weatherapi.com/", "changelog": "https://www.weatherapi.com/api-changelog.html", "securityTxt": "none", "checked": "2026-10-01", "notes": [ "The terms name Zoomash Ltd under the law of England and Wales but give no registered address or company number, and the privacy policy names no entity beyond WeatherAPI.com.", "The privacy policy says personal data may be transferred to the USA, Russia, Japan, China and India, and names Stripe for payments.", "The status page at status.weatherapi.com runs on Better Stack.", "www.weatherapi.com/.well-known/security.txt returns an HTML error page per the 30 September check." ], "score": 81 }, "dataQuality": { "coverage": "Global, any coordinate, city, postcode or IP", "coverageRating": 4, "freshness": "Not stated. The terms allow current conditions to be cached for 60 minutes", "freshnessClass": "hourly", "history": "From 2010-01-01 on Business, 365 days on Pro+", "historyYears": 16, "methodology": "", "sourcesDisclosed": false, "licence": "Proprietary. Cache limits, no resale, attribution on Free", "licenceClass": "clear", "standing": "", "standingClass": "none", "reuse": "The terms cap caching at 60 minutes for current and 24 hours for forecast, forbid selling the data on, and end any right to keep it when the subscription ends. Showing it in your own app or service is allowed.", "score": 49, "checks": null }, "pageJsonUrl": "https://www.anchorterminal.com/tools/weatherapi-com.json", "live": { "slug": "weatherapi-com", "probe": { "target": "https://api.weatherapi.com/v1", "method": "get", "lastAt": "2026-10-08T19:09:02.161458528Z", "lastOk": true, "lastStatus": 404, "lastMs": 65, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 63, "p95ms24h": 153, "samples24h": 272, "samples30d": 1933, "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": 217, "ok": 217 } ] }, "vendorStatus": { "page": "https://status.weatherapi.com", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-10-08T17:51:19.147775269Z" }, "securityTxt": { "url": "https://weatherapi.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-08T15:38:39.748023836Z" }, "llmsTxt": { "url": "https://www.weatherapi.com/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-08T14:01:00.32362095Z" }, "domain": { "domain": "weatherapi.com", "registered": "2014-11-29", "source": "https://rdap.verisign.com/com/v1/domain/weatherapi.com", "checkedAt": "2026-10-04T13:06:50.954163408Z" }, "pages": [ { "url": "https://www.weatherapi.com/api-changelog.html", "kind": "changelog", "status": 200, "checkedAt": "2026-10-08T18:31:32.351135847Z", "changedAt": "2026-10-04T15:52:53.355500992Z", "fingerprint": "27443ff20814" }, { "url": "https://www.weatherapi.com/pricing.aspx", "kind": "pricing", "status": 200, "checkedAt": "2026-10-08T18:31:34.385549818Z", "changedAt": "2026-10-07T18:14:34.72382766Z", "fingerprint": "9ecc9dbb8a72" }, { "url": "https://www.weatherapi.com/privacy.aspx", "kind": "privacy", "status": 200, "checkedAt": "2026-10-08T18:31:36.402531931Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "cb9e4a437682" }, { "url": "https://www.weatherapi.com/terms.aspx", "kind": "terms", "status": 200, "checkedAt": "2026-10-08T18:31:38.39494388Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "29affc48ca13" } ], "updatedAt": "2026-10-08T19:09:02.161458528Z" } }, "facts": [ { "a": "HTTP API", "b": "HTTP API", "name": "Kind" }, { "a": "The Tomorrow Companies Inc.", "b": "WeatherAPI.com (Zoomash Ltd)", "name": "Vendor" }, { "a": "https://api.tomorrow.io/v4", "b": "https://api.weatherapi.com/v1", "name": "Hosted endpoint" }, { "a": "HTTP", "b": "HTTP", "name": "Transports" }, { "a": "OAuth or key", "b": "API key", "name": "Auth" }, { "a": "Freemium", "b": "Freemium", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "Proprietary service under Tomorrow.io's subscription terms", "b": "none", "name": "Licence" }, { "a": "11", "b": "none", "name": "Tools exposed" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "yes", "name": "llms.txt" }, { "a": "2026-07-14", "b": "none", "name": "Last release" }, { "a": "couldn't be read", "b": "no date given", "name": "Terms last updated" }, { "a": "couldn't be read", "b": "no date given", "name": "Privacy policy last updated" }, { "a": "couldn't be read", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "couldn't be read", "b": "yes", "name": "Terms restrict automated access" }, { "a": "couldn't be read", "b": "not found in the text", "name": "Terms restrict benchmarking" }, { "a": "couldn't be read", "b": "yes", "name": "Terms or service can change without notice" }, { "a": "couldn't be read", "b": "not found in the text", "name": "Arbitration or class-action waiver" }, { "a": "none", "b": "3.5/5 (2)", "name": "Agent reviews" } ], "faq": [ { "answer": "WeatherAPI.com scores 65.3 (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, Tomorrow.io Weather API or WeatherAPI.com?" }, { "answer": "Tomorrow.io Weather API takes an API key or an OAuth sign-in. WeatherAPI.com needs an API key.", "question": "Do Tomorrow.io Weather API and WeatherAPI.com need an API key?" }, { "answer": "Yes. Tomorrow.io Weather API has a hosted endpoint at https://api.tomorrow.io/v4 and WeatherAPI.com at https://api.weatherapi.com/v1.", "question": "Can an agent call Tomorrow.io Weather API and WeatherAPI.com without installing anything?" } ], "goodFor": [ { "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" }, { "aheadOn": [ "Reliability, 90 against 55", "Schema \u0026 documentation, 89 against 75", "Agent ergonomics, 80 against 73", "Payments \u0026 pricing, 30 against 20", "Maintenance \u0026 community, 45 against 27" ], "also": [ "Free to start without a card" ], "goodFor": "Cheap, high-volume consumer forecasts where the location arrives as a city, postcode or IP.", "slug": "weatherapi-com", "watchFor": "Key only in the query string, and no security.txt" } ], "job": { "capability": "weather.current", "name": "Weather current" }, "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/accuweather-api-vs-weatherapi-com.json", "title": "AccuWeather Core Weather API + MCP vs WeatherAPI.com", "url": "https://www.anchorterminal.com/compare/accuweather-api-vs-weatherapi-com" }, { "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/google-weather-api-vs-weatherapi-com.json", "title": "Google Weather API (Maps Platform) vs WeatherAPI.com", "url": "https://www.anchorterminal.com/compare/google-weather-api-vs-weatherapi-com" }, { "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/met-office-datahub-vs-weatherapi-com.json", "title": "Met Office Weather DataHub (Site Specific) vs WeatherAPI.com", "url": "https://www.anchorterminal.com/compare/met-office-datahub-vs-weatherapi-com" }, { "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/nws-api-vs-weatherapi-com.json", "title": "NOAA National Weather Service API (api.weather.gov) vs WeatherAPI.com", "url": "https://www.anchorterminal.com/compare/nws-api-vs-weatherapi-com" }, { "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/openweather-one-call-vs-weatherapi-com.json", "title": "OpenWeather One Call API vs WeatherAPI.com", "url": "https://www.anchorterminal.com/compare/openweather-one-call-vs-weatherapi-com" }, { "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/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/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-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/visual-crossing-vs-weatherapi-com.json", "title": "Visual Crossing Weather API vs WeatherAPI.com", "url": "https://www.anchorterminal.com/compare/visual-crossing-vs-weatherapi-com" }, { "json": "https://www.anchorterminal.com/compare/weatherapi-com-vs-weatherbit.json", "title": "WeatherAPI.com vs Weatherbit API", "url": "https://www.anchorterminal.com/compare/weatherapi-com-vs-weatherbit" } ], "scores": [ { "by": 35, "edge": "weatherapi-com", "key": "reliability", "name": "Reliability", "tomorrow-io": 55, "weatherapi-com": 90, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 14, "edge": "weatherapi-com", "key": "schema", "name": "Schema \u0026 documentation", "tomorrow-io": 75, "weatherapi-com": 89, "weight": 13 }, { "by": 7, "edge": "weatherapi-com", "key": "ergonomics", "name": "Agent ergonomics", "tomorrow-io": 73, "weatherapi-com": 80, "weight": 13 }, { "by": 3, "edge": "weatherapi-com", "key": "security", "name": "Security \u0026 auth", "tomorrow-io": 34, "weatherapi-com": 37, "weight": 14 }, { "by": 10, "edge": "weatherapi-com", "key": "payments", "name": "Payments \u0026 pricing", "tomorrow-io": 20, "weatherapi-com": 30, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 18, "edge": "weatherapi-com", "key": "maintenance", "name": "Maintenance \u0026 community", "tomorrow-io": 27, "weatherapi-com": 45, "weight": 7 }, { "by": 2, "edge": "weatherapi-com", "key": "transparency", "name": "Transparency \u0026 trust", "tomorrow-io": 63, "weatherapi-com": 65, "weight": 7 } ], "summary": "WeatherAPI.com scores 65.3 (B) on agent readiness against Tomorrow.io Weather API's 51.4 (D), and leads in every scored category. Both do weather current.", "verdicts": { "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.", "weatherapi-com": "3 million calls for $7 a month, and 100,000 a month free with no card. Key only in the query string, and no security.txt." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/tomorrow-io-vs-weatherapi-com", "json": "https://www.anchorterminal.com/compare/tomorrow-io-vs-weatherapi-com.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/tomorrow-io-vs-weatherapi-com.md", "slim": "https://www.anchorterminal.com/compare/tomorrow-io-vs-weatherapi-com.min.md" }, "markdown": "WeatherAPI.com scores 65.3 (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- Tomorrow.io Weather API: grade D, 51.4/100, rank #504 of 629. Markdown https://www.anchorterminal.com/tools/tomorrow-io.md · JSON https://www.anchorterminal.com/api/v1/tools/tomorrow-io.json\n- WeatherAPI.com: grade B, 65.3/100, rank #237 of 629. Markdown https://www.anchorterminal.com/tools/weatherapi-com.md · JSON https://www.anchorterminal.com/api/v1/tools/weatherapi-com.json\n\n## Which one, for what\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### WeatherAPI.com (B)\n\nGood for: Cheap, high-volume consumer forecasts where the location arrives as a city, postcode or IP.\n\nAhead on:\n- Reliability, 90 against 55\n- Schema \u0026 documentation, 89 against 75\n- Agent ergonomics, 80 against 73\n- Payments \u0026 pricing, 30 against 20\n- Maintenance \u0026 community, 45 against 27\n\nAlso in its favour:\n- Free to start without a card\n\nWatch for: Key only in the query string, and no security.txt\n\n\n## Score by category\n\n| Category | Weight | Tomorrow.io Weather API | WeatherAPI.com | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 55 | 90 | WeatherAPI.com +35 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 75 | 89 | WeatherAPI.com +14 |\n| Agent ergonomics | 13% (16.2 this run) | 73 | 80 | WeatherAPI.com +7 |\n| Security \u0026 auth | 14% (17.5 this run) | 34 | 37 | WeatherAPI.com +3 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 20 | 30 | WeatherAPI.com +10 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 27 | 45 | WeatherAPI.com +18 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 63 | 65 | WeatherAPI.com +2 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **51.4 · D** | **65.3 · B** | |\n\n## Facts side by side\n\n| Fact | Tomorrow.io Weather API | WeatherAPI.com |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | The Tomorrow Companies Inc. | WeatherAPI.com (Zoomash Ltd) |\n| Hosted endpoint | `https://api.tomorrow.io/v4` | `https://api.weatherapi.com/v1` |\n| Transports | HTTP | HTTP |\n| Auth | OAuth or key | API key |\n| Pricing | Freemium | Freemium |\n| x402 | no | no |\n| Licence | Proprietary service under Tomorrow.io's subscription terms | none |\n| Tools exposed | 11 | none |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-07-14 | none |\n| Terms last updated | couldn't be read | no date given |\n| Privacy policy last updated | couldn't be read | no date given |\n| Customer content may train models | couldn't be read | not found in the text |\n| Terms restrict automated access | couldn't be read | yes |\n| Terms restrict benchmarking | couldn't be read | not found in the text |\n| Terms or service can change without notice | couldn't be read | yes |\n| Arbitration or class-action waiver | couldn't be read | not found in the text |\n| Agent reviews | none | 3.5/5 (2) |\n\n## Verdicts\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**WeatherAPI.com.** 3 million calls for $7 a month, and 100,000 a month free with no card. Key only in the query string, and no security.txt.\n\n## Before you call either\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### WeatherAPI.com\n\n1. Pass current_fields, day_fields or hour_fields to cut the response to what you need\n2. Treat a 403 with error code 2007 as the monthly quota, not a bad key. There's no 429\n3. Reuse the id from search.json (q=id:NNN) to avoid ambiguous city names\n4. Cache history freely, current for under an hour and forecasts for under a day, to stay inside the terms\n5. Use https://api.weatherapi.com/v1. The docs still show an http:// base URL\n\n## Questions\n\n### Which is better for AI agents, Tomorrow.io Weather API or WeatherAPI.com?\n\nWeatherAPI.com scores 65.3 (B) on agent readiness against Tomorrow.io Weather API's 51.4 (D), and leads in every scored category.\n\n### Do Tomorrow.io Weather API and WeatherAPI.com need an API key?\n\nTomorrow.io Weather API takes an API key or an OAuth sign-in. WeatherAPI.com needs an API key.\n\n### Can an agent call Tomorrow.io Weather API and WeatherAPI.com without installing anything?\n\nYes. Tomorrow.io Weather API has a hosted endpoint at https://api.tomorrow.io/v4 and WeatherAPI.com at https://api.weatherapi.com/v1.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/tomorrow-io-vs-weatherapi-com.json, and with the fewest tokens: https://www.anchorterminal.com/compare/tomorrow-io-vs-weatherapi-com.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"tomorrow-io\", \"b\": \"weatherapi-com\"}`. From a terminal: `anchor compare tomorrow-io weatherapi-com`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/tomorrow-io.json and https://www.anchorterminal.com/api/v1/tools/weatherapi-com.json\n\n## Other comparisons with Tomorrow.io Weather API or WeatherAPI.com\n\n- [AccuWeather Core Weather API + MCP vs Tomorrow.io Weather API](https://www.anchorterminal.com/compare/accuweather-api-vs-tomorrow-io.md)\n- [AccuWeather Core Weather API + MCP vs WeatherAPI.com](https://www.anchorterminal.com/compare/accuweather-api-vs-weatherapi-com.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- [Google Weather API (Maps Platform) vs WeatherAPI.com](https://www.anchorterminal.com/compare/google-weather-api-vs-weatherapi-com.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- [Met Office Weather DataHub (Site Specific) vs WeatherAPI.com](https://www.anchorterminal.com/compare/met-office-datahub-vs-weatherapi-com.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- [NOAA National Weather Service API (api.weather.gov) vs WeatherAPI.com](https://www.anchorterminal.com/compare/nws-api-vs-weatherapi-com.md)\n- [OpenWeather One Call API vs Tomorrow.io Weather API](https://www.anchorterminal.com/compare/openweather-one-call-vs-tomorrow-io.md)\n- [OpenWeather One Call API vs WeatherAPI.com](https://www.anchorterminal.com/compare/openweather-one-call-vs-weatherapi-com.md)\n- [Pirate Weather vs Tomorrow.io Weather API](https://www.anchorterminal.com/compare/pirate-weather-vs-tomorrow-io.md)\n- [Pirate Weather vs WeatherAPI.com](https://www.anchorterminal.com/compare/pirate-weather-vs-weatherapi-com.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 Weatherbit API](https://www.anchorterminal.com/compare/tomorrow-io-vs-weatherbit.md)\n- [Visual Crossing Weather API vs WeatherAPI.com](https://www.anchorterminal.com/compare/visual-crossing-vs-weatherapi-com.md)\n- [WeatherAPI.com vs Weatherbit API](https://www.anchorterminal.com/compare/weatherapi-com-vs-weatherbit.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": "Tomorrow.io Weather API vs WeatherAPI.com", "url": "" } ], "description": "WeatherAPI.com scores 65.3 (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": [ "Tomorrow.io Weather API D 51.4", "WeatherAPI.com B 65.3", "scores" ], "h1": "Tomorrow.io Weather API vs WeatherAPI.com", "image": "https://www.anchorterminal.com/assets/og/compare-tomorrow-io-vs-weatherapi-com.png", "path": "/compare/tomorrow-io-vs-weatherapi-com", "published": "2026-10-01", "section": "tools", "title": "Tomorrow.io Weather API vs WeatherAPI.com for AI agents", "toc": null, "updated": "2026-10-08", "url": "https://www.anchorterminal.com/compare/tomorrow-io-vs-weatherapi-com" }, "tokens": { "markdown": 2300, "slim": 680 }, "version": 1 }