Compare frameworks
Guardrails vs Letta vs LangChain
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 | Letta | LangChain |
|---|---|---|---|
| Stars | 7,443Synced from sourceCurrent4h ago | 24,864Synced from sourceCurrent4h ago | 146,956 (highest of the compared values)Synced from sourceCurrent4h ago |
| downloads | — | — | 2,026,447Synced from sourceCurrent4h ago |
| Last commit | 2026-09-22Synced from sourceCurrent4h ago | 2026-09-10Synced from sourceCurrent4h ago | 2026-09-24Synced from sourceCurrent4h ago |
| Language | pythonSeeded, unreviewedwritten 1mo ago | pythonSeeded, unreviewedwritten 1mo ago | pythonSeeded, unreviewedwritten 1mo ago |
| Licence | Apache-2.0Synced from sourceCurrent4h ago | Apache-2.0Synced from sourceCurrent4h ago | MITSynced from sourceCurrent4h ago |
| Archived | noSynced from sourceCurrent4h ago | noSynced from sourceCurrent4h ago | noSynced from sourceCurrent4h ago |
| Category | validationSeeded, unreviewedwritten 1mo ago | memorySeeded, unreviewedwritten 1mo ago | orchestrationSeeded, unreviewedwritten 1mo ago |
| Contributors | 79Synced from sourceCurrent4h ago | 155Synced from sourceCurrent4h ago | 3740Synced from sourceCurrent4h ago |
| Forks | 708Synced from sourceCurrent4h ago | 2628Synced from sourceCurrent4h ago | 24587Synced from sourceCurrent4h ago |
| Maintainer | Guardrails AISeeded, unreviewedwritten 1mo ago | LettaSeeded, unreviewedwritten 1mo ago | LangChainSeeded, unreviewedwritten 1mo ago |
| npm downloads, monthly | — | — | 10553700Synced from sourceCurrent4h ago |
| npm downloads, weekly | — | — | 2026447Synced from sourceCurrent4h ago |
| npm package | — | — | langchainSynced from sourceCurrent4h ago |
| npm window ends | — | — | 2026-09-21Synced from sourceCurrent4h ago |
| Open issues | 80Synced from sourceCurrent4h ago | 0Synced from sourceCurrent4h ago | 561Synced from sourceCurrent4h ago |
| PyPI package | guardrails-aiSynced from sourceCurrent4h ago | lettaSynced from sourceCurrent4h ago | langchainSynced from sourceCurrent4h ago |
| PyPI released | 2026-08-14T14:22:27.750056ZSynced from sourceCurrent4h ago | 2026-09-23T23:59:05.225455ZSynced from sourceCurrent4h ago | 2026-09-18T17:31:10.056247ZSynced from sourceCurrent4h ago |
| Requires Python | <3.14,>=3.10Synced from sourceCurrent4h ago | >=3.9Synced from sourceCurrent4h ago | <4.0.0,>=3.10.0Synced from sourceCurrent4h ago |
| PyPI version | 0.11.0Synced from sourceCurrent4h ago | 0.33.0Synced from sourceCurrent4h ago | 1.4.2Synced from sourceCurrent4h ago |
| Repository | https://github.com/guardrails-ai/guardrailsSynced from sourceCurrent4h ago | https://github.com/letta-ai/lettaSynced from sourceCurrent4h ago | https://github.com/langchain-ai/langchainSynced 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.
Change the comparison
Remove one, or open the directory to pick a different set. Up to 3 at a time.