Compare frameworks
Haystack vs LangChain 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 | Haystack | LangChain | Vercel AI SDK |
|---|---|---|---|
| Stars | 26,618Synced from sourceCurrent4h ago | 147,178 (highest of the compared values)Synced from sourceCurrent4h ago | 27,001Synced from sourceCurrent4h ago |
| downloads | — | 3,201,198Synced from sourceCurrent4h ago | 29,813,554 (highest of the compared values)Synced from sourceCurrent4h ago |
| Last commit | 2026-09-25Synced from sourceCurrent4h ago | 2026-09-27Synced from sourceCurrent4h ago | 2026-09-28Synced from sourceCurrent4h ago |
| Language | pythonSeeded, unreviewedwritten 1mo ago | pythonSeeded, unreviewedwritten 1mo ago | typescriptSeeded, unreviewedwritten 1mo ago |
| Licence | Apache-2.0Synced from sourceCurrent4h ago | MITSynced from sourceCurrent4h ago | — |
| Archived | noSynced from sourceCurrent4h ago | noSynced from sourceCurrent4h ago | noSynced from sourceCurrent4h ago |
| Category | ragSeeded, unreviewedwritten 1mo ago | orchestrationSeeded, unreviewedwritten 1mo ago | orchestrationSeeded, unreviewedwritten 1mo ago |
| Contributors | 479Synced from sourceCurrent4h ago | 3741Synced from sourceCurrent4h ago | 719Synced from sourceCurrent4h ago |
| Forks | 3198Synced from sourceCurrent4h ago | 24634Synced from sourceCurrent4h ago | 5207Synced from sourceCurrent4h ago |
| Maintainer | deepsetSeeded, unreviewedwritten 1mo ago | LangChainSeeded, unreviewedwritten 1mo ago | VercelSeeded, unreviewedwritten 1mo ago |
| npm downloads, monthly | — | 10682493Synced from sourceCurrent4h ago | 92989638Synced from sourceCurrent4h ago |
| npm downloads, weekly | — | 3201198Synced from sourceCurrent4h ago | 29813554Synced from sourceCurrent4h ago |
| npm package | — | langchainSynced from sourceCurrent4h ago | aiSynced from sourceCurrent4h ago |
| npm window ends | — | 2026-09-26Synced from sourceCurrent4h ago | 2026-09-26Synced from sourceCurrent4h ago |
| Open issues | 183Synced from sourceCurrent4h ago | 569Synced from sourceCurrent4h ago | 1450Synced from sourceCurrent4h ago |
| PyPI package | haystack-aiSynced from sourceCurrent4h ago | langchainSynced from sourceCurrent4h ago | — |
| PyPI released | 2026-09-24T10:49:23.742948ZSynced from sourceCurrent4h ago | 2026-09-18T17:31:10.056247ZSynced from sourceCurrent4h ago | — |
| Requires Python | >=3.10Synced from sourceCurrent4h ago | <4.0.0,>=3.10.0Synced from sourceCurrent4h ago | — |
| PyPI version | 3.2.0Synced from sourceCurrent4h ago | 1.4.2Synced from sourceCurrent4h ago | — |
| Repository | https://github.com/deepset-ai/haystackSynced from sourceCurrent4h ago | https://github.com/langchain-ai/langchainSynced from sourceCurrent4h ago | https://github.com/vercel/aiSynced 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.