Compare frameworks
Instructor 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 | Instructor | Mastra | Vercel AI SDK |
|---|---|---|---|
| Stars | 14,101Synced from sourceCurrent3h ago | 29,400 (highest of the compared values)Synced from sourceCurrent3h ago | 27,805Synced from sourceCurrent3h ago |
| downloads | 13,080,962Synced from sourceStale2mo ago· past SLA | 3,150,478Synced from sourceCurrent3h ago | 45,262,880 (highest of the compared values)Synced from sourceCurrent3h ago |
| Last commit | 2026-11-06Synced from sourceCurrent3h ago | 2026-11-08Synced from sourceCurrent3h ago | 2026-11-07Synced from sourceCurrent3h ago |
| Language | pythonSeeded, unreviewedwritten 2mo ago | typescriptSeeded, unreviewedwritten 2mo ago | typescriptSeeded, unreviewedwritten 2mo ago |
| Licence | MITSynced from sourceCurrent3h ago | — | — |
| Archived | noSynced from sourceCurrent3h ago | noSynced from sourceCurrent3h ago | noSynced from sourceCurrent3h ago |
| Category | structured-outputSeeded, unreviewedwritten 2mo ago | orchestrationSeeded, unreviewedwritten 2mo ago | orchestrationSeeded, unreviewedwritten 2mo ago |
| Contributors | 268Synced from sourceCurrent3h ago | 701Synced from sourceCurrent3h ago | 783Synced from sourceCurrent3h ago |
| Forks | 1360Synced from sourceCurrent3h ago | 3085Synced from sourceCurrent3h ago | 5549Synced from sourceCurrent3h ago |
| Maintainer | 567 LabsSeeded, unreviewedwritten 2mo ago | MastraSeeded, unreviewedwritten 2mo ago | VercelSeeded, unreviewedwritten 2mo ago |
| npm downloads, monthly | — | 10391822Synced from sourceCurrent3h ago | 145134192Synced from sourceCurrent3h ago |
| npm downloads, weekly | — | 3150478Synced from sourceCurrent3h ago | 45262880Synced from sourceCurrent3h ago |
| npm package | — | @mastra/coreSynced from sourceCurrent3h ago | aiSynced from sourceCurrent3h ago |
| npm window ends | — | 2026-11-06Synced from sourceCurrent3h ago | 2026-11-06Synced from sourceCurrent3h ago |
| Open issues | 11Synced from sourceCurrent3h ago | 820Synced from sourceCurrent3h ago | 1505Synced from sourceCurrent3h ago |
| PyPI downloads, monthly | 27671654Synced from sourceStale2mo ago· past SLA | — | — |
| PyPI downloads, weekly | 13080962Synced from sourceStale2mo ago· past SLA | — | — |
| PyPI package | instructorSynced from sourceCurrent3h ago | — | — |
| PyPI released | 2026-09-09T02:25:54.888746ZSynced from sourceCurrent3h ago | — | — |
| Requires Python | <4.0,>=3.9Synced from sourceCurrent3h ago | — | — |
| PyPI version | 1.17.0Synced from sourceCurrent3h ago | — | — |
| Repository | https://github.com/567-labs/instructorSynced from sourceCurrent3h ago | https://github.com/mastra-ai/mastraSynced from sourceCurrent3h ago | https://github.com/vercel/aiSynced from sourceCurrent3h ago |
Sources: GitHub REST API, npm registry downloads, PyPI registry metadata, pypistats.org downloads. Most recent observation 3h 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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