head to head · open source
ponytail vs loopy
ponytail has 182,779 GitHub stars, 10,094 forks, 270 open issues and last shipped 5 days ago. loopy has 3,216 stars, 285 forks, 5 open issues and last shipped 2 months ago. ponytail leads on adoption by 5,583% (182,779 vs 3,216 stars). ponytail is written in JavaScript under MIT; loopy is written in JavaScript under MIT. ponytail has attracted 6% as many forks as stars, loopy 9%. ponytail was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 3 topic tags (agent-skills, ai-agents, prompt-engineering), 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 | loopy | |
|---|---|---|
| GitHub stars | ★ 183K | ★ 3.2K |
| License | MIT | MIT |
| Written in | JavaScript | JavaScript |
| Last push | 2026-10-29 | 2026-09-11 |
| Forks | ⑂ 10K | ⑂ 285 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick ponytail if
- You weight community size — 183K stars and counting
- You want the MIT license terms
- Your stack matches JavaScript
- You value the larger contributor base for long-term maintenance
pick loopy if
- You want the loopy feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches JavaScript
- You evaluated both and loopy fits your workflow better
About ponytail
Ponytail He says nothing. He writes one line. It works. 54% less code (up to 94%) · 20% cheaper · 27% faster · 100% safe Measured on real Claude Code sessions editing a real open source repo (FastAPI + React), against the same agent with no skill. 54% is the mean across 12 feature tasks (Haiku 4.5, n=4); it reaches 94% where an agent over builds (a date picker) and is near zero where the code is already minimal. ponytail keeps every safety guard while a bare "write one liners" prompt drops one. (The earlier single shot benchmark reported 80 94% as a flat figure; against a fair agentic…
read the full ponytail overview →
About loopy
Loop Library Loop Library has two separate but related parts in this repository: The website is the library; Loopy is a companion way to work with it. You can browse or give an agent the website without installing Loopy. Installing Loopy adds the guided workflow, but it does not install or host the website. Agents that do not have Loopy can use the published agent guide, agent instructions, JSON catalog, or plain text catalog directly. Each published loop tells an agent what to do, how to check its work, what to try next, and when to stop. What is a loop? Most prompts ask an agent to do something once. A loop…
read the full loopy overview →
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Frequently asked questions
Is ponytail or loopy more popular?
ponytail has 182,779 GitHub stars and loopy has 3,216. ponytail has the larger community by that measure.
Are ponytail and loopy free?
Both are open source. ponytail is licensed under MIT and loopy under MIT. Neither carries a licence fee.
What is the difference between ponytail and loopy?
ponytail is written in JavaScript and loopy in JavaScript. 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 loopy?
Choose ponytail if you want the larger community (182,779 stars) or its MIT licence terms. Choose loopy if its feature set, stack or MIT licence fits better. Both are self-hostable.