head to head · open source
ponytail vs unstract
ponytail has 182,779 GitHub stars, 10,094 forks, 270 open issues and last shipped 5 days ago. unstract has 7,402 stars, 747 forks, 96 open issues and last shipped yesterday. ponytail leads on adoption by 2,369% (182,779 vs 7,402 stars). ponytail is written in JavaScript under MIT; unstract is written in Python under AGPL-3.0. ponytail has attracted 6% as many forks as stars, unstract 10%. unstract was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 3 topic tags (ai-agents, llm, 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 | unstract | |
|---|---|---|
| GitHub stars | ★ 183K | ★ 7.4K |
| License | MIT | AGPL-3.0 |
| Written in | JavaScript | Python |
| Last push | 2026-10-29 | 2026-11-02 |
| Forks | ⑂ 10K | ⑂ 747 |
| 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 unstract if
- You want the unstract feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches Python
- You evaluated both and unstract 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 unstract
Unstract Turn Unstructured Documents into Structured Data Documentation Enterprise What is Unstract? Unstract uses LLMs to extract structured JSON from documents — PDFs, images, scans, you name it. Define what you want to extract using natural language prompts, and deploy as an API or ETL pipeline. Built for teams in finance , insurance , healthcare , KYC/compliance , and much more. Current State vs. Unstract ⭐ If Unstract helps you, star this repo! ✨ Key Features Prompt Studio — Define document extraction schemas with natural language. Docs → API Deployment — Send a document over REST API, get JSON back. Docs →…
read the full unstract overview →
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Frequently asked questions
Is ponytail or unstract more popular?
ponytail has 182,779 GitHub stars and unstract has 7,402. ponytail has the larger community by that measure.
Are ponytail and unstract free?
Both are open source. ponytail is licensed under MIT and unstract under AGPL-3.0. Neither carries a licence fee.
What is the difference between ponytail and unstract?
ponytail is written in JavaScript and unstract 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 unstract?
Choose ponytail if you want the larger community (182,779 stars) or its MIT licence terms. Choose unstract if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.