Compare frameworks
Letta vs Haystack vs Ragas
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 | Letta | Haystack | Ragas |
|---|---|---|---|
| Stars | 24,923Synced from sourceCurrent4h ago | 26,618 (highest of the compared values)Synced from sourceCurrent4h ago | 15,862Synced from sourceCurrent4h ago |
| Last commit | 2026-09-10Synced from sourceCurrent4h ago | 2026-09-25Synced from sourceCurrent4h ago | 2026-02-24Synced 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 | Apache-2.0Synced from sourceCurrent4h ago |
| Archived | noSynced from sourceCurrent4h ago | noSynced from sourceCurrent4h ago | noSynced from sourceCurrent4h ago |
| Category | memorySeeded, unreviewedwritten 1mo ago | ragSeeded, unreviewedwritten 1mo ago | evaluationSeeded, unreviewedwritten 1mo ago |
| Contributors | 155Synced from sourceCurrent4h ago | 479Synced from sourceCurrent4h ago | 246Synced from sourceCurrent4h ago |
| Forks | 2631Synced from sourceCurrent4h ago | 3198Synced from sourceCurrent4h ago | 1728Synced from sourceCurrent4h ago |
| Maintainer | LettaSeeded, unreviewedwritten 1mo ago | deepsetSeeded, unreviewedwritten 1mo ago | Vibrant LabsSeeded, unreviewedwritten 1mo ago |
| Open issues | 0Synced from sourceCurrent4h ago | 183Synced from sourceCurrent4h ago | 617Synced from sourceCurrent4h ago |
| PyPI package | lettaSynced from sourceCurrent4h ago | haystack-aiSynced from sourceCurrent4h ago | ragasSynced from sourceCurrent4h ago |
| PyPI released | 2026-09-28T04:32:31.896015ZSynced from sourceCurrent4h ago | 2026-09-24T10:49:23.742948ZSynced from sourceCurrent4h ago | 2026-01-13T17:47:59.200116ZSynced from sourceCurrent4h ago |
| Requires Python | >=3.9Synced from sourceCurrent4h ago | >=3.10Synced from sourceCurrent4h ago | >=3.9Synced from sourceCurrent4h ago |
| PyPI version | 0.33.5Synced from sourceCurrent4h ago | 3.2.0Synced from sourceCurrent4h ago | 0.4.3Synced from sourceCurrent4h ago |
| Repository | https://github.com/letta-ai/lettaSynced from sourceCurrent4h ago | https://github.com/deepset-ai/haystackSynced from sourceCurrent4h ago | https://github.com/vibrantlabsai/ragasSynced 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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