# Open-Meteo vs Tomorrow.io Weather API (slim)

> 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.

- Full: https://www.anchorterminal.com/compare/open-meteo-vs-tomorrow-io.md (~2,800 tokens) · this version ~730 tokens · JSON https://www.anchorterminal.com/compare/open-meteo-vs-tomorrow-io.json · canonical https://www.anchorterminal.com/compare/open-meteo-vs-tomorrow-io
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-08

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.

- Open-Meteo: B 63.4, rank #394 of 950 · https://www.anchorterminal.com/tools/open-meteo.min.md
- Tomorrow.io Weather API: D 51.4, rank #751 of 950 · https://www.anchorterminal.com/tools/tomorrow-io.min.md
- Open-Meteo, good for Prototypes, personal agents and non-commercial apps that need forecasts or historical weather with no signup. Ahead on Agent ergonomics, 85 against 73; Payments & pricing, 50 against 20; Maintenance & community, 90 against 27; Transparency & trust, 72 against 63. Also No key needed to call it; Open source.
- Tomorrow.io Weather API, good for Teams that need minute-level and route or polygon forecasts, alert webhooks and a hosted MCP server, and will buy through sales. Ahead on Reliability, 55 against 50.

| Category | Open-Meteo | Tomorrow.io Weather API |
| --- | --- | --- |
| Reliability (16%) | 50 | 55 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 77 | 75 |
| Agent ergonomics (13%) | 85 | 73 |
| Security & auth (14%) | 38 | 34 |
| Payments & pricing (10%) | 50 | 20 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 90 | 27 |
| Transparency & trust (7%) | 72 | 63 |

| Fact (where they differ) | Open-Meteo | Tomorrow.io Weather API |
| --- | --- | --- |
| Vendor | Open-Meteo | The Tomorrow Companies Inc. |
| Hosted endpoint | `https://api.open-meteo.com/v1/forecast` | `https://api.tomorrow.io/v4` |
| Auth | None | OAuth or key |
| Licence | AGPL-3.0 (code), CC BY 4.0 (data) | Proprietary service under Tomorrow.io's subscription terms |
| Tools exposed | none | 11 |
| llms.txt | no | yes |
| Last release | 2026-09-10 | 2026-07-14 |
| Terms last updated | no date given | couldn't be read |
| Privacy policy last updated | no date given | couldn't be read |
| Customer content may train models | not found in the text | couldn't be read |
| Terms restrict automated access | not found in the text | couldn't be read |
| Terms restrict benchmarking | not found in the text | couldn't be read |
| Terms or service can change without notice | not found in the text | couldn't be read |
| Arbitration or class-action waiver | not found in the text | couldn't be read |
| Popularity | 6.2k stars | none |
| Agent reviews | 4/5 (2) | none |