Compare frameworks
Guardrails vs Semantic Kernel vs Mastra
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 | Semantic Kernel | Mastra |
|---|---|---|---|
| Stars | 7,443Synced from sourceCurrent4h ago | 28,593 (highest of the compared values)Synced from sourceCurrent4h ago | 28,295Synced from sourceCurrent4h ago |
| downloads | — | — | 1,161,907Synced from sourceCurrent4h ago |
| Last commit | 2026-09-22Synced from sourceCurrent4h ago | 2026-09-19Synced from sourceCurrent4h ago | 2026-09-24Synced from sourceCurrent4h ago |
| Language | pythonSeeded, unreviewedwritten 1mo ago | csharpSeeded, 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 | validationSeeded, unreviewedwritten 1mo ago | orchestrationSeeded, unreviewedwritten 1mo ago | orchestrationSeeded, unreviewedwritten 1mo ago |
| Contributors | 79Synced from sourceCurrent4h ago | 416Synced from sourceCurrent4h ago | 678Synced from sourceCurrent4h ago |
| Forks | 708Synced from sourceCurrent4h ago | 4787Synced from sourceCurrent4h ago | 2845Synced from sourceCurrent4h ago |
| Maintainer | Guardrails AISeeded, unreviewedwritten 1mo ago | MicrosoftSeeded, unreviewedwritten 1mo ago | MastraSeeded, unreviewedwritten 1mo ago |
| npm downloads, monthly | — | — | 5528725Synced from sourceCurrent4h ago |
| npm downloads, weekly | — | — | 1161907Synced from sourceCurrent4h ago |
| npm package | — | — | @mastra/coreSynced from sourceCurrent4h ago |
| npm window ends | — | — | 2026-09-21Synced from sourceCurrent4h ago |
| Open issues | 80Synced from sourceCurrent4h ago | 320Synced from sourceCurrent4h ago | 447Synced from sourceCurrent4h ago |
| PyPI package | guardrails-aiSynced from sourceCurrent4h ago | semantic-kernelSynced from sourceCurrent4h ago | — |
| PyPI released | 2026-08-14T14:22:27.750056ZSynced from sourceCurrent4h ago | 2026-08-06T09:56:42.518861ZSynced from sourceCurrent4h ago | — |
| Requires Python | <3.14,>=3.10Synced from sourceCurrent4h ago | >=3.10Synced from sourceCurrent4h ago | — |
| PyPI version | 0.11.0Synced from sourceCurrent4h ago | 1.44.1Synced from sourceCurrent4h ago | — |
| Repository | https://github.com/guardrails-ai/guardrailsSynced from sourceCurrent4h ago | https://github.com/microsoft/semantic-kernelSynced from sourceCurrent4h ago | https://github.com/mastra-ai/mastraSynced 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.
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