head to head · open source
ponytail vs unstract
ponytail has 141,465 GitHub stars, 7,581 forks, 270 open issues and last shipped 4 days ago. unstract has 7,244 stars, 716 forks, 96 open issues and last shipped today. ponytail leads on adoption by 1,853% (141,465 vs 7,244 stars). ponytail is written in JavaScript under MIT; unstract is written in Python under AGPL-3.0. ponytail has attracted 5% 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.
← all 8884 open source comparisons
Side by side
| ponytail | unstract | |
|---|---|---|
| GitHub stars | ★ 141K | ★ 7.2K |
| License | MIT | AGPL-3.0 |
| Written in | JavaScript | Python |
| Last push | 2026-09-14 | 2026-09-18 |
| Forks | ⑂ 7.6K | ⑂ 716 |
| 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 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 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 unstract
Unstract is an open source platform that uses large language models to extract structured JSON from unstructured documents such as PDFs, images, and scans, and it is built for teams in finance, insurance, healthcare, and KYC/compliance that need that extraction delivered as an API or an ETL pipeline.
read the full unstract overview →
More in AI & Machine Learning
Related comparisons
More AI Development Platforms projects
Compare either of these against the rest of the AI Development Platforms field.
Frequently asked questions
Is ponytail or unstract more popular?
ponytail has 141,465 GitHub stars and unstract has 7,244. 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 (141,465 stars) or its MIT licence terms. Choose unstract if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.