head to head · open source
ponytail vs AgentOS
ponytail has 182,259 GitHub stars, 10,044 forks, 270 open issues and last shipped 5 days ago. AgentOS has 683 stars, 101 forks, 10 open issues and last shipped yesterday. ponytail leads on adoption by 26,585% (182,259 vs 683 stars). ponytail is written in JavaScript under MIT; AgentOS is written in TypeScript under Apache-2.0. ponytail has attracted 6% as many forks as stars, AgentOS 15%. AgentOS was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (ai-agents, 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 | AgentOS | |
|---|---|---|
| GitHub stars | ★ 182K | ★ 683 |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | TypeScript |
| Last push | 2026-10-29 | 2026-11-02 |
| Forks | ⑂ 10K | ⑂ 101 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick ponytail if
- You weight community size — 182K stars and counting
- You want the MIT license terms
- Your stack matches JavaScript
- You value the larger contributor base for long-term maintenance
pick AgentOS if
- You want the AgentOS feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches TypeScript
- You evaluated both and AgentOS 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 AgentOS
AgentOS · TypeScript AI Agent Framework Agents that remember, forge their own tools, and survive long running sessions. Persistent cognitive memory, optional HEXACO personality, multi agent orchestration, and one dispatch interface across 11 LLM providers. Apache 2.0. Benchmarks Website Docs npm Discord Blog AgentOS is an open source TypeScript framework for AI agents that remember, adapt, and write their own tools . Top open source memory benchmarks: 85.6% on LongMemEval S at $0.0090/correct (gpt 4o), and 70.2% on LongMemEval M, the only open source library above 65% on M with reproducible methodology. Runtime…
read the full AgentOS overview →
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Frequently asked questions
Is ponytail or AgentOS more popular?
ponytail has 182,259 GitHub stars and AgentOS has 683. ponytail has the larger community by that measure.
Are ponytail and AgentOS free?
Both are open source. ponytail is licensed under MIT and AgentOS under Apache-2.0. Neither carries a licence fee.
What is the difference between ponytail and AgentOS?
ponytail is written in JavaScript and AgentOS in TypeScript. 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 AgentOS?
Choose ponytail if you want the larger community (182,259 stars) or its MIT licence terms. Choose AgentOS if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.