Compare frameworks
LangChain vs DeepEval vs Letta
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 | LangChain | DeepEval | Letta |
|---|---|---|---|
| Stars | 147,178 (highest of the compared values)Synced from sourceCurrent4h ago | 18,476Synced from sourceCurrent4h ago | 24,923Synced from sourceCurrent4h ago |
| downloads | 3,201,198Synced from sourceCurrent4h ago | — | — |
| Last commit | 2026-09-27Synced from sourceCurrent4h ago | 2026-09-25Synced from sourceCurrent4h ago | 2026-09-10Synced from sourceCurrent4h ago |
| Language | pythonSeeded, unreviewedwritten 1mo ago | pythonSeeded, unreviewedwritten 1mo ago | pythonSeeded, unreviewedwritten 1mo ago |
| Licence | MITSynced from sourceCurrent4h ago | Apache-2.0Synced from sourceCurrent4h ago | Apache-2.0Synced from sourceCurrent4h ago |
| Archived | noSynced from sourceCurrent4h ago | noSynced from sourceCurrent4h ago | noSynced from sourceCurrent4h ago |
| Category | orchestrationSeeded, unreviewedwritten 1mo ago | evaluationSeeded, unreviewedwritten 1mo ago | memorySeeded, unreviewedwritten 1mo ago |
| Contributors | 3741Synced from sourceCurrent4h ago | 337Synced from sourceCurrent4h ago | 155Synced from sourceCurrent4h ago |
| Forks | 24634Synced from sourceCurrent4h ago | 1989Synced from sourceCurrent4h ago | 2631Synced from sourceCurrent4h ago |
| Maintainer | LangChainSeeded, unreviewedwritten 1mo ago | Confident AISeeded, unreviewedwritten 1mo ago | LettaSeeded, unreviewedwritten 1mo ago |
| npm downloads, monthly | 10682493Synced from sourceCurrent4h ago | — | — |
| npm downloads, weekly | 3201198Synced from sourceCurrent4h ago | — | — |
| npm package | langchainSynced from sourceCurrent4h ago | — | — |
| npm window ends | 2026-09-26Synced from sourceCurrent4h ago | — | — |
| Open issues | 569Synced from sourceCurrent4h ago | 676Synced from sourceCurrent4h ago | 0Synced from sourceCurrent4h ago |
| PyPI package | langchainSynced from sourceCurrent4h ago | deepevalSynced from sourceCurrent4h ago | lettaSynced from sourceCurrent4h ago |
| PyPI released | 2026-09-18T17:31:10.056247ZSynced from sourceCurrent4h ago | 2026-09-24T09:31:55.310624ZSynced from sourceCurrent4h ago | 2026-09-28T04:32:31.896015ZSynced from sourceCurrent4h ago |
| Requires Python | <4.0.0,>=3.10.0Synced from sourceCurrent4h ago | <4.0,>=3.9Synced from sourceCurrent4h ago | >=3.9Synced from sourceCurrent4h ago |
| PyPI version | 1.4.2Synced from sourceCurrent4h ago | 4.2.6Synced from sourceCurrent4h ago | 0.33.5Synced from sourceCurrent4h ago |
| Repository | https://github.com/langchain-ai/langchainSynced from sourceCurrent4h ago | https://github.com/confident-ai/deepevalSynced from sourceCurrent4h ago | https://github.com/letta-ai/lettaSynced from sourceCurrent4h ago |
Sources: GitHub REST API, npm registry downloads, PyPI registry metadata, pypistats.org downloads. Most recent observation 4h 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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