head to head · open source
cognee vs datachain
cognee has 30,848 GitHub stars, 3,066 forks, 495 open issues and last shipped yesterday. datachain has 2,820 stars, 157 forks, 101 open issues and last shipped today. cognee leads on adoption by 994% (30,848 vs 2,820 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 | ★ 31K | ★ 2.8K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Python | Python |
| Last push | 2026-09-19 | 2026-09-20 |
| Forks | ⑂ 3.1K | ⑂ 157 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick cognee if
- You weight community size — 31K 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 is an open source AI memory platform for agents, released under the Apache 2.0 license and written in Python. It ingests data in any format and builds a self hosted knowledge graph that agents query to recall, connect, and act with full context across sessions. The project lives in the Python ecosystem, installs through standard package managers, and sits in the AI and machine learning infrastructure category alongside graph databases and context engineering tooling. A companion research paper, "Optimizing the Interface Between Knowledge Graphs and LLMs for Complex Reasoning" by Markovic et al., 2025, docu…
read the full cognee overview →
About datachain
DataChain is an Apache 2.0 Python library that turns files in S3, GCS, and Azure into versioned, typed datasets queryable at warehouse speed, and it is built for data and machine learning teams handling unstructured data as well as for the AI coding agents that operate on those datasets.
read the full datachain overview →
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Frequently asked questions
Is cognee or datachain more popular?
cognee has 30,848 GitHub stars and datachain has 2,820. 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 (30,848 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.