head to head · open source
effect vs GoModel
effect has 16,138 GitHub stars, 752 forks, 253 open issues and last shipped today. GoModel has 1,171 stars, 101 forks, 80 open issues and last shipped yesterday. effect leads on adoption by 1,278% (16,138 vs 1,171 stars). effect is written in TypeScript under MIT; GoModel is written in Go under MIT. effect has attracted 5% as many forks as stars, GoModel 9%. effect was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (observability), 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
| effect | GoModel | |
|---|---|---|
| GitHub stars | ★ 16K | ★ 1.2K |
| License | MIT | MIT |
| Written in | TypeScript | Go |
| Last push | 2026-09-20 | 2026-09-19 |
| Forks | ⑂ 752 | ⑂ 101 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick effect if
- You weight community size — 16K stars and counting
- You want the MIT license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick GoModel if
- You want the GoModel feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Go
- You evaluated both and GoModel fits your workflow better
About effect
Effect is a TypeScript library for building robust, maintainable, type safe, and production grade applications. It lives in the TypeScript and JavaScript ecosystem, distributed as the core effect package alongside a monorepo of integration packages that extend it. The project is MIT licensed, has been developed for roughly seven years, and currently ships Effect V4 as a release candidate, with the main branch holding v4 development and the v3 branch retaining the previous line.
read the full effect overview →
About GoModel
GoModel is an MIT licensed AI gateway, control plane and proxy written in Go that exposes one OpenAI compatible endpoint at /v1 and one Anthropic compatible endpoint at /v1/messages in front of OpenAI, Anthropic, Gemini, Groq, xAI, Ollama, vLLM and many other providers, for teams that run their own LLM traffic and want routing, caching, spend control and observability in a single self hosted service.
read the full GoModel overview →
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Frequently asked questions
Is effect or GoModel more popular?
effect has 16,138 GitHub stars and GoModel has 1,171. effect has the larger community by that measure.
Are effect and GoModel free?
Both are open source. effect is licensed under MIT and GoModel under MIT. Neither carries a licence fee.
What is the difference between effect and GoModel?
effect is written in TypeScript and GoModel 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, effect or GoModel?
Choose effect if you want the larger community (16,138 stars) or its MIT licence terms. Choose GoModel if its feature set, stack or MIT licence fits better. Both are self-hostable.