head to head · open source
ponytail vs sepia
ponytail has 141,465 GitHub stars, 7,581 forks, 270 open issues and last shipped 4 days ago. sepia has 2,672 stars, 175 forks, 8 open issues and last shipped yesterday. ponytail leads on adoption by 5,194% (141,465 vs 2,672 stars). ponytail is written in JavaScript under MIT; sepia is written in Python under MIT. ponytail has attracted 5% as many forks as stars, sepia 7%. sepia was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 5 topic tags (agent-skills, 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 | sepia | |
|---|---|---|
| GitHub stars | ★ 141K | ★ 2.7K |
| License | MIT | MIT |
| Written in | JavaScript | Python |
| Last push | 2026-09-14 | 2026-09-17 |
| Forks | ⑂ 7.6K | ⑂ 175 |
| 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 sepia if
- You want the sepia feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Python
- You evaluated both and sepia 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 sepia
sepia English 繁體中文 简体中文 De AI writing at the layer that actually gives AI away. Fiction gets its narrative architecture repaired before anyone touches word choice; professional documents (release notes, PR replies, postmortems, tickets, technical articles) each get rules matched to their venue. A portable Agent Skill: any agent that speaks the standard can load it, and the Skills CLI, which supports 77+ agents, installs it with one command. Claude Code, Codex, Grok Build, Antigravity, and QwenPaw additionally get native plugin packaging. One canonical SKILL.md , no per platform forks. Four operations: write , rev…
read the full sepia overview →
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Frequently asked questions
Is ponytail or sepia more popular?
ponytail has 141,465 GitHub stars and sepia has 2,672. ponytail has the larger community by that measure.
Are ponytail and sepia free?
Both are open source. ponytail is licensed under MIT and sepia under MIT. Neither carries a licence fee.
What is the difference between ponytail and sepia?
ponytail is written in JavaScript and sepia 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 sepia?
Choose ponytail if you want the larger community (141,465 stars) or its MIT licence terms. Choose sepia if its feature set, stack or MIT licence fits better. Both are self-hostable.