head to head · open source
ponytail vs rtk
ponytail has 142,629 GitHub stars, 7,653 forks, 270 open issues and last shipped 6 days ago. rtk has 81,060 stars, 5,138 forks, 1,642 open issues and last shipped yesterday. ponytail leads on adoption by 76% (142,629 vs 81,060 stars). ponytail is written in JavaScript under MIT; rtk is written in Rust under Apache-2.0. ponytail has attracted 5% as many forks as stars, rtk 6%. rtk was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 3 topic tags (claude-code, developer-tools, llm), 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
| ponytail | rtk | |
|---|---|---|
| GitHub stars | ★ 143K | ★ 81K |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | Rust |
| Last push | 2026-09-14 | 2026-09-19 |
| Forks | ⑂ 7.7K | ⑂ 5.1K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick ponytail if
- You weight community size — 143K stars and counting
- You want the MIT license terms
- Your stack matches JavaScript
- You value the larger contributor base for long-term maintenance
pick rtk if
- You want the rtk feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Rust
- You evaluated both and rtk 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 rtk
rtk is an Apache 2.0 Rust CLI proxy that sits between an AI coding agent and the shell, filtering and compressing command output so 60 90% fewer tokens reach the model, and it is built for developers running agentic coding tools such as Claude Code, Cursor, or Codex against real repositories.
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Frequently asked questions
Is ponytail or rtk more popular?
ponytail has 142,629 GitHub stars and rtk has 81,060. ponytail has the larger community by that measure.
Are ponytail and rtk free?
Both are open source. ponytail is licensed under MIT and rtk under Apache-2.0. Neither carries a licence fee.
What is the difference between ponytail and rtk?
ponytail is written in JavaScript and rtk in Rust. 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 rtk?
Choose ponytail if you want the larger community (142,629 stars) or its MIT licence terms. Choose rtk if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.