head to head · open source
cognee vs datachain
cognee has 33,036 GitHub stars, 3,456 forks, 495 open issues and last shipped 2 days ago. datachain has 2,830 stars, 178 forks, 101 open issues and last shipped yesterday. cognee leads on adoption by 1,067% (33,036 vs 2,830 stars). cognee is written in Python under Apache-2.0; datachain is written in Python under Apache-2.0. cognee has attracted 10% as many forks as stars, datachain 6%. datachain was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (ai-agents), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| cognee | datachain | |
|---|---|---|
| GitHub stars | ★ 33K | ★ 2.8K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Python | Python |
| Last push | 2026-11-03 | 2026-11-04 |
| Forks | ⑂ 3.5K | ⑂ 178 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick cognee if
- You weight community size — 33K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick datachain if
- You want the datachain feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Python
- You evaluated both and datachain fits your workflow better
About cognee
Cognee The Open Source AI Memory Platform for Agents Demo . Docs . Learn More · Join Discord · Join r/AIMemory . Community Plugins & Add ons Cognee is the open source AI memory platform that gives AI agents persistent long term memory across sessions. Ingest data in any format, build a self hosted knowledge graph, and let every agent recall, connect, and act with full context 🌐 This README is also available in: Deutsch Español Français 日本語 한국어 Português Русский 中文 📄 Read the research paper: Optimizing the Interface Between Knowledge Graphs and LLMs for Complex Reasoning — Markovic et al., 2025 When to use…
read the full cognee overview →
About datachain
DataChain: The Context Layer for Unstructured Data A Python library that turns files in S3, GCS, and Azure into versioned, typed datasets, queryable at warehouse speed. Compute Engine : parallel Python over files, distributed on Studio. Async I/O, checkpoint recovery, incremental updates. Dataset DB : Pydantic schemas, versioning, file pointers, automatic lineage. Sub second filter, join, and group by over millions of typed records locally, hundreds of millions on Studio. Vector search over the same rows, no separate store. Optional, for agent workflows: Knowledge Base : markdown summaries derived from the…
read the full datachain overview →
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Frequently asked questions
Is cognee or datachain more popular?
cognee has 33,036 GitHub stars and datachain has 2,830. cognee has the larger community by that measure.
Are cognee and datachain free?
Both are open source. cognee is licensed under Apache-2.0 and datachain under Apache-2.0. Neither carries a licence fee.
What is the difference between cognee and datachain?
cognee is written in Python and datachain in Python. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, cognee or datachain?
Choose cognee if you want the larger community (33,036 stars) or its Apache-2.0 licence terms. Choose datachain if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.