Compare frameworks
Guardrails vs LangChain 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 | Guardrails | LangChain | Letta |
|---|---|---|---|
| Stars | 7,456Synced from sourceCurrent5h ago | 147,178 (highest of the compared values)Synced from sourceCurrent5h ago | 24,923Synced from sourceCurrent5h ago |
| downloads | — | 3,201,198Synced from sourceCurrent5h ago | — |
| Last commit | 2026-09-25Synced from sourceCurrent5h ago | 2026-09-27Synced from sourceCurrent5h ago | 2026-09-10Synced from sourceCurrent5h ago |
| Language | pythonSeeded, unreviewedwritten 1mo ago | pythonSeeded, unreviewedwritten 1mo ago | pythonSeeded, unreviewedwritten 1mo ago |
| Licence | Apache-2.0Synced from sourceCurrent5h ago | MITSynced from sourceCurrent5h ago | Apache-2.0Synced from sourceCurrent5h ago |
| Archived | noSynced from sourceCurrent5h ago | noSynced from sourceCurrent5h ago | noSynced from sourceCurrent5h ago |
| Category | validationSeeded, unreviewedwritten 1mo ago | orchestrationSeeded, unreviewedwritten 1mo ago | memorySeeded, unreviewedwritten 1mo ago |
| Contributors | 79Synced from sourceCurrent5h ago | 3741Synced from sourceCurrent5h ago | 155Synced from sourceCurrent5h ago |
| Forks | 707Synced from sourceCurrent5h ago | 24634Synced from sourceCurrent5h ago | 2631Synced from sourceCurrent5h ago |
| Maintainer | Guardrails AISeeded, unreviewedwritten 1mo ago | LangChainSeeded, unreviewedwritten 1mo ago | LettaSeeded, unreviewedwritten 1mo ago |
| npm downloads, monthly | — | 10682493Synced from sourceCurrent5h ago | — |
| npm downloads, weekly | — | 3201198Synced from sourceCurrent5h ago | — |
| npm package | — | langchainSynced from sourceCurrent5h ago | — |
| npm window ends | — | 2026-09-26Synced from sourceCurrent5h ago | — |
| Open issues | 79Synced from sourceCurrent5h ago | 569Synced from sourceCurrent5h ago | 0Synced from sourceCurrent5h ago |
| PyPI package | guardrails-aiSynced from sourceCurrent5h ago | langchainSynced from sourceCurrent5h ago | lettaSynced from sourceCurrent5h ago |
| PyPI released | 2026-08-14T14:22:27.750056ZSynced from sourceCurrent5h ago | 2026-09-18T17:31:10.056247ZSynced from sourceCurrent5h ago | 2026-09-28T04:32:31.896015ZSynced from sourceCurrent5h ago |
| Requires Python | <3.14,>=3.10Synced from sourceCurrent5h ago | <4.0.0,>=3.10.0Synced from sourceCurrent5h ago | >=3.9Synced from sourceCurrent5h ago |
| PyPI version | 0.11.0Synced from sourceCurrent5h ago | 1.4.2Synced from sourceCurrent5h ago | 0.33.5Synced from sourceCurrent5h ago |
| Repository | https://github.com/guardrails-ai/guardrailsSynced from sourceCurrent5h ago | https://github.com/langchain-ai/langchainSynced from sourceCurrent5h ago | https://github.com/letta-ai/lettaSynced from sourceCurrent5h ago |
Sources: GitHub REST API, npm registry downloads, PyPI registry metadata, pypistats.org downloads. Most recent observation 5h 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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