head to head · open source
ponytail vs langtrace
ponytail has 141,230 GitHub stars, 7,572 forks, 270 open issues and last shipped 4 days ago. langtrace has 1,231 stars, 127 forks, 2 open issues and last shipped 10 months ago. ponytail leads on adoption by 11,373% (141,230 vs 1,231 stars). ponytail is written in JavaScript under MIT; langtrace is written in TypeScript under AGPL-3.0. ponytail has attracted 5% as many forks as stars, langtrace 10%. ponytail was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (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 | langtrace | |
|---|---|---|
| GitHub stars | ★ 141K | ★ 1.2K |
| License | MIT | AGPL-3.0 |
| Written in | JavaScript | TypeScript |
| Last push | 2026-09-14 | 2025-11-17 |
| Forks | ⑂ 7.6K | ⑂ 127 |
| 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 langtrace if
- You want the langtrace feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches TypeScript
- You evaluated both and langtrace 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 langtrace
Langtrace is an open source, OpenTelemetry based end to end observability tool for LLM applications that captures and analyzes real time traces, evaluations and metrics across LLM APIs, vector databases and LLM frameworks, and it is aimed at developers and LLMOps teams who need to see what their LLM backed applications are actually doing in production.
read the full langtrace overview →
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Frequently asked questions
Is ponytail or langtrace more popular?
ponytail has 141,230 GitHub stars and langtrace has 1,231. ponytail has the larger community by that measure.
Are ponytail and langtrace free?
Both are open source. ponytail is licensed under MIT and langtrace under AGPL-3.0. Neither carries a licence fee.
What is the difference between ponytail and langtrace?
ponytail is written in JavaScript and langtrace 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 langtrace?
Choose ponytail if you want the larger community (141,230 stars) or its MIT licence terms. Choose langtrace if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.