Compare frameworks
DeepEval vs Haystack vs Vercel AI SDK
Every figure below carries the source that reported it and the moment it was observed. Values that failed validation are withheld rather than shown, and a dash means no source we track carries that field for that framework.
| Field | DeepEval | Haystack | Vercel AI SDK |
|---|---|---|---|
| Stars | 18,419Synced from sourceCurrent2h ago | 26,584Synced from sourceCurrent2h ago | 26,922 (highest of the compared values)Synced from sourceCurrent2h ago |
| downloads | — | — | 17,883,737Synced from sourceCurrent2h ago |
| Last commit | 2026-09-23Synced from sourceCurrent2h ago | 2026-09-23Synced from sourceCurrent2h ago | 2026-09-24Synced from sourceCurrent2h ago |
| Language | pythonSeeded, unreviewedwritten 1mo ago | pythonSeeded, unreviewedwritten 1mo ago | typescriptSeeded, unreviewedwritten 1mo ago |
| Licence | Apache-2.0Synced from sourceCurrent2h ago | Apache-2.0Synced from sourceCurrent2h ago | — |
| Archived | noSynced from sourceCurrent2h ago | noSynced from sourceCurrent2h ago | noSynced from sourceCurrent2h ago |
| Category | evaluationSeeded, unreviewedwritten 1mo ago | ragSeeded, unreviewedwritten 1mo ago | orchestrationSeeded, unreviewedwritten 1mo ago |
| Contributors | 337Synced from sourceCurrent2h ago | 475Synced from sourceCurrent2h ago | 715Synced from sourceCurrent2h ago |
| Forks | 1973Synced from sourceCurrent2h ago | 3176Synced from sourceCurrent2h ago | 5180Synced from sourceCurrent2h ago |
| Maintainer | Confident AISeeded, unreviewedwritten 1mo ago | deepsetSeeded, unreviewedwritten 1mo ago | VercelSeeded, unreviewedwritten 1mo ago |
| npm downloads, monthly | — | — | 87791075Synced from sourceCurrent2h ago |
| npm downloads, weekly | — | — | 17883737Synced from sourceCurrent2h ago |
| npm package | — | — | aiSynced from sourceCurrent2h ago |
| npm window ends | — | — | 2026-09-21Synced from sourceCurrent2h ago |
| Open issues | 654Synced from sourceCurrent2h ago | 168Synced from sourceCurrent2h ago | 1462Synced from sourceCurrent2h ago |
| PyPI package | deepevalSynced from sourceCurrent2h ago | haystack-aiSynced from sourceCurrent2h ago | — |
| PyPI released | 2026-09-22T19:26:34.903554ZSynced from sourceCurrent2h ago | 2026-09-03T09:27:43.312258ZSynced from sourceCurrent2h ago | — |
| Requires Python | <4.0,>=3.9Synced from sourceCurrent2h ago | >=3.10Synced from sourceCurrent2h ago | — |
| PyPI version | 4.2.5Synced from sourceCurrent2h ago | 3.1.1Synced from sourceCurrent2h ago | — |
| Repository | https://github.com/confident-ai/deepevalSynced from sourceCurrent2h ago | https://github.com/deepset-ai/haystackSynced from sourceCurrent2h ago | https://github.com/vercel/aiSynced from sourceCurrent2h ago |
Sources: GitHub REST API, npm registry downloads, PyPI registry metadata, pypistats.org downloads. Most recent observation 2h ago. Where a row is marked, ▲ is the highest of the values shown and ▼ the lowest — arithmetic on the figures above, not a ranking or a recommendation. Rows where neither extreme is meaningful are left unmarked rather than given a direction they do not have.
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