head to head · open source
Uptime Kuma vs effect
Uptime Kuma has 91,477 GitHub stars, 8,426 forks, 805 open issues and last shipped yesterday. effect has 16,097 stars, 747 forks, 253 open issues and last shipped yesterday. Uptime Kuma leads on adoption by 468% (91,477 vs 16,097 stars). Uptime Kuma is written in JavaScript under MIT; effect is written in TypeScript under MIT. Uptime Kuma has attracted 9% as many forks as stars, effect 5%. Uptime Kuma was the more recently maintained of the two, and both are self-hostable with no licence fee.
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
| Uptime Kuma | effect | |
|---|---|---|
| GitHub stars | ★ 91K | ★ 16K |
| License | MIT | MIT |
| Written in | JavaScript | TypeScript |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 8.4K | ⑂ 747 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Uptime Kuma if
- You weight community size — 91K stars and counting
- You want the MIT license terms
- Your stack matches JavaScript
- You value the larger contributor base for long-term maintenance
pick effect if
- You want the effect feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and effect fits your workflow better
About Uptime Kuma
Uptime Kuma is a free, MIT licensed, self hosted monitoring tool with a reactive web dashboard, built for operators and teams that want to watch their own HTTP, TCP, and DNS endpoints and keep the resulting data on their own infrastructure.
read the full Uptime Kuma overview →
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 →
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Frequently asked questions
Is Uptime Kuma or effect more popular?
Uptime Kuma has 91,477 GitHub stars and effect has 16,097. Uptime Kuma has the larger community by that measure.
Are Uptime Kuma and effect free?
Both are open source. Uptime Kuma is licensed under MIT and effect under MIT. Neither carries a licence fee.
What is the difference between Uptime Kuma and effect?
Uptime Kuma is written in JavaScript and effect in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Uptime Kuma or effect?
Choose Uptime Kuma if you want the larger community (91,477 stars) or its MIT licence terms. Choose effect if its feature set, stack or MIT licence fits better. Both are self-hostable.