head to head · open source
cognee vs Arize Phoenix
cognee has 33,036 GitHub stars, 3,456 forks, 495 open issues and last shipped 2 days ago. Arize Phoenix has 12,128 stars, 1,261 forks, 970 open issues and last shipped yesterday. cognee leads on adoption by 172% (33,036 vs 12,128 stars). cognee is written in Python under Apache-2.0; Arize Phoenix is written in Python under a custom or non-standard licence. cognee has attracted 10% as many forks as stars, Arize Phoenix 10%. Arize Phoenix was the more recently maintained of the two, and both are self-hostable with no licence fee.
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 | Arize Phoenix | |
|---|---|---|
| GitHub stars | ★ 33K | ★ 12K |
| License | Apache-2.0 | Custom / other |
| Written in | Python | Python |
| Last push | 2026-11-03 | 2026-11-04 |
| Forks | ⑂ 3.5K | ⑂ 1.3K |
| 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 Arize Phoenix if
- You want the Arize Phoenix feature set and don't need the biggest community
- You prefer the Custom / other license terms
- Your stack matches Python
- You evaluated both and Arize Phoenix 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 Arize Phoenix
English · 简体中文 Arize Phoenix is Arize's open source AI observability platform designed for experimentation, evaluation, and troubleshooting. For managed production workflows, Arize also offers Arize AX. Phoenix provides: Tracing Trace your LLM application's runtime using OpenTelemetry based instrumentation. Evaluation Leverage LLMs to benchmark your application's performance using response and retrieval evals. Datasets Create versioned datasets of examples for experimentation, evaluation, and fine tuning. Experiments Track and evaluate changes to prompts, LLMs, and retrieval. Playground Optimize prompts, compare…
read the full Arize Phoenix overview →
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Frequently asked questions
Is cognee or Arize Phoenix more popular?
cognee has 33,036 GitHub stars and Arize Phoenix has 12,128. cognee has the larger community by that measure.
Are cognee and Arize Phoenix free?
Both are open source. cognee is licensed under Apache-2.0, and Arize Phoenix has no licence declared in this registry. Both are free to self-host.
What is the difference between cognee and Arize Phoenix?
cognee is written in Python and Arize Phoenix 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 Arize Phoenix?
Choose cognee if you want the larger community (33,036 stars) or its Apache-2.0 licence terms. Choose Arize Phoenix if its feature set, stack or Custom / other licence fits better. Both are self-hostable.