Compare frameworks
LangChain vs Mastra 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 | LangChain | Mastra | Vercel AI SDK |
|---|---|---|---|
| Stars | 146,956 (highest of the compared values)Synced from sourceCurrent2h ago | 28,295Synced from sourceCurrent2h ago | 26,922Synced from sourceCurrent2h ago |
| downloads | 2,026,447Synced from sourceCurrent2h ago | 1,161,907Synced from sourceCurrent2h ago | 17,883,737 (highest of the compared values)Synced from sourceCurrent2h ago |
| Last commit | 2026-09-24Synced from sourceCurrent2h ago | 2026-09-24Synced from sourceCurrent2h ago | 2026-09-24Synced from sourceCurrent2h ago |
| Language | pythonSeeded, unreviewedwritten 1mo ago | typescriptSeeded, unreviewedwritten 1mo ago | typescriptSeeded, unreviewedwritten 1mo ago |
| Licence | MITSynced from sourceCurrent2h ago | — | — |
| Archived | noSynced from sourceCurrent2h ago | noSynced from sourceCurrent2h ago | noSynced from sourceCurrent2h ago |
| Category | orchestrationSeeded, unreviewedwritten 1mo ago | orchestrationSeeded, unreviewedwritten 1mo ago | orchestrationSeeded, unreviewedwritten 1mo ago |
| Contributors | 3740Synced from sourceCurrent2h ago | 678Synced from sourceCurrent2h ago | 715Synced from sourceCurrent2h ago |
| Forks | 24587Synced from sourceCurrent2h ago | 2845Synced from sourceCurrent2h ago | 5180Synced from sourceCurrent2h ago |
| Maintainer | LangChainSeeded, unreviewedwritten 1mo ago | MastraSeeded, unreviewedwritten 1mo ago | VercelSeeded, unreviewedwritten 1mo ago |
| npm downloads, monthly | 10553700Synced from sourceCurrent2h ago | 5528725Synced from sourceCurrent2h ago | 87791075Synced from sourceCurrent2h ago |
| npm downloads, weekly | 2026447Synced from sourceCurrent2h ago | 1161907Synced from sourceCurrent2h ago | 17883737Synced from sourceCurrent2h ago |
| npm package | langchainSynced from sourceCurrent2h ago | @mastra/coreSynced from sourceCurrent2h ago | aiSynced from sourceCurrent2h ago |
| npm window ends | 2026-09-21Synced from sourceCurrent2h ago | 2026-09-21Synced from sourceCurrent2h ago | 2026-09-21Synced from sourceCurrent2h ago |
| Open issues | 561Synced from sourceCurrent2h ago | 447Synced from sourceCurrent2h ago | 1462Synced from sourceCurrent2h ago |
| PyPI package | langchainSynced from sourceCurrent2h ago | — | — |
| PyPI released | 2026-09-18T17:31:10.056247ZSynced from sourceCurrent2h ago | — | — |
| Requires Python | <4.0.0,>=3.10.0Synced from sourceCurrent2h ago | — | — |
| PyPI version | 1.4.2Synced from sourceCurrent2h ago | — | — |
| Repository | https://github.com/langchain-ai/langchainSynced from sourceCurrent2h ago | https://github.com/mastra-ai/mastraSynced 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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