head to head · open source
ponytail vs R2R
ponytail has 141,465 GitHub stars, 7,581 forks, 270 open issues and last shipped 4 days ago. R2R has 7,998 stars, 647 forks, 126 open issues and last shipped 11 months ago. ponytail leads on adoption by 1,669% (141,465 vs 7,998 stars). ponytail is written in JavaScript under MIT; R2R is written in Python under MIT. ponytail has attracted 5% as many forks as stars, R2R 8%. ponytail 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
| ponytail | R2R | |
|---|---|---|
| GitHub stars | ★ 141K | ★ 8.0K |
| License | MIT | MIT |
| Written in | JavaScript | Python |
| Last push | 2026-09-14 | 2025-11-07 |
| Forks | ⑂ 7.6K | ⑂ 647 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick ponytail if
- You weight community size — 141K stars and counting
- You want the MIT license terms
- Your stack matches JavaScript
- You value the larger contributor base for long-term maintenance
pick R2R if
- You want the R2R feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Python
- You evaluated both and R2R fits your workflow better
About ponytail
Ponytail is an open source agent skill for JavaScript and LLM based coding tools that makes an AI agent write the minimum working code for a task, and it is built for developers and teams running agents such as Claude Code, Codex, or Cursor against real repositories.
read the full ponytail overview →
About R2R
R2R is an MIT licensed, Python based retrieval system from SciPhi AI that gives developers a RESTful API for agentic Retrieval Augmented Generation over their own documents, with official Python and JavaScript clients.
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Frequently asked questions
Is ponytail or R2R more popular?
ponytail has 141,465 GitHub stars and R2R has 7,998. ponytail has the larger community by that measure.
Are ponytail and R2R free?
Both are open source. ponytail is licensed under MIT and R2R under MIT. Neither carries a licence fee.
What is the difference between ponytail and R2R?
ponytail is written in JavaScript and R2R 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, ponytail or R2R?
Choose ponytail if you want the larger community (141,465 stars) or its MIT licence terms. Choose R2R if its feature set, stack or MIT licence fits better. Both are self-hostable.