Compare frameworks
Haystack vs Pydantic AI vs DeepEval
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 | Haystack | Pydantic AI | DeepEval |
|---|---|---|---|
| Stars | 26,943 (highest of the compared values)Synced from sourceCurrent3h ago | 21,085Synced from sourceCurrent3h ago | 19,359Synced from sourceCurrent3h ago |
| downloads | — | 3,076,771Synced from sourceStale2mo ago· past SLA | — |
| Last commit | 2026-11-07Synced from sourceCurrent3h ago | 2026-11-08Synced from sourceCurrent3h ago | 2026-11-07Synced from sourceCurrent3h ago |
| Language | pythonSeeded, unreviewedwritten 2mo ago | pythonSeeded, unreviewedwritten 2mo ago | pythonSeeded, unreviewedwritten 2mo ago |
| Licence | Apache-2.0Synced from sourceCurrent3h ago | MITSynced from sourceCurrent3h ago | Apache-2.0Synced from sourceCurrent3h ago |
| Archived | noSynced from sourceCurrent3h ago | noSynced from sourceCurrent3h ago | noSynced from sourceCurrent3h ago |
| Category | ragSeeded, unreviewedwritten 2mo ago | structured-outputSeeded, unreviewedwritten 2mo ago | evaluationSeeded, unreviewedwritten 2mo ago |
| Contributors | 556Synced from sourceCurrent3h ago | 658Synced from sourceCurrent3h ago | 348Synced from sourceCurrent3h ago |
| Forks | 3406Synced from sourceCurrent3h ago | 3127Synced from sourceCurrent3h ago | 2177Synced from sourceCurrent3h ago |
| Maintainer | deepsetSeeded, unreviewedwritten 2mo ago | PydanticSeeded, unreviewedwritten 2mo ago | Confident AISeeded, unreviewedwritten 2mo ago |
| Open issues | 173Synced from sourceCurrent3h ago | 1825Synced from sourceCurrent3h ago | 814Synced from sourceCurrent3h ago |
| PyPI downloads, monthly | — | 13478631Synced from sourceStale2mo ago· past SLA | — |
| PyPI downloads, weekly | — | 3076771Synced from sourceStale2mo ago· past SLA | — |
| PyPI package | haystack-aiSynced from sourceCurrent3h ago | pydantic-aiSynced from sourceCurrent3h ago | deepevalSynced from sourceCurrent3h ago |
| PyPI released | 2026-10-21T19:10:50.167432ZSynced from sourceCurrent3h ago | 2026-11-04T10:28:38.510837ZSynced from sourceCurrent3h ago | 2026-11-04T11:29:23.499144ZSynced from sourceCurrent3h ago |
| Requires Python | >=3.11Synced from sourceCurrent3h ago | >=3.11Synced from sourceCurrent3h ago | <4.0,>=3.9Synced from sourceCurrent3h ago |
| PyPI version | 3.4.1Synced from sourceCurrent3h ago | 2.66.0Synced from sourceCurrent3h ago | 4.3.3Synced from sourceCurrent3h ago |
| Repository | https://github.com/deepset-ai/haystackSynced from sourceCurrent3h ago | https://github.com/pydantic/pydantic-aiSynced from sourceCurrent3h ago | https://github.com/confident-ai/deepevalSynced from sourceCurrent3h ago |
Sources: GitHub REST API, npm registry downloads, PyPI registry metadata, pypistats.org downloads. Most recent observation 3h 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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