head to head · open source
ponytail vs Envoy AI Gateway
ponytail has 141,230 GitHub stars, 7,572 forks, 270 open issues and last shipped 4 days ago. Envoy AI Gateway has 2,115 stars, 378 forks, 285 open issues and last shipped yesterday. ponytail leads on adoption by 6,578% (141,230 vs 2,115 stars). ponytail is written in JavaScript under MIT; Envoy AI Gateway is written in Go under Apache-2.0. ponytail has attracted 5% as many forks as stars, Envoy AI Gateway 18%. Envoy AI Gateway 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 | Envoy AI Gateway | |
|---|---|---|
| GitHub stars | ★ 141K | ★ 2.1K |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | Go |
| Last push | 2026-09-14 | 2026-09-17 |
| Forks | ⑂ 7.6K | ⑂ 378 |
| 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 Envoy AI Gateway if
- You want the Envoy AI Gateway feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Go
- You evaluated both and Envoy AI Gateway 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 Envoy AI Gateway
Envoy AI Gateway is an open source control plane for AI and agent traffic, powered by Envoy. The README says the project is now Agent Router, an Agentic AI Foundation project, while the directory entry still uses the Envoy AI Gateway name. It lives in the Envoy, Envoy Gateway, Kubernetes, API gateway, LLM, and AI gateway ecosystem.
read the full Envoy AI Gateway overview →
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Frequently asked questions
Is ponytail or Envoy AI Gateway more popular?
ponytail has 141,230 GitHub stars and Envoy AI Gateway has 2,115. ponytail has the larger community by that measure.
Are ponytail and Envoy AI Gateway free?
Both are open source. ponytail is licensed under MIT and Envoy AI Gateway under Apache-2.0. Neither carries a licence fee.
What is the difference between ponytail and Envoy AI Gateway?
ponytail is written in JavaScript and Envoy AI Gateway in Go. 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 Envoy AI Gateway?
Choose ponytail if you want the larger community (141,230 stars) or its MIT licence terms. Choose Envoy AI Gateway if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.