head to head · open source
Uptime Kuma vs alertmanager
Uptime Kuma has 93,190 GitHub stars, 8,655 forks, 805 open issues and last shipped yesterday. alertmanager has 8,677 stars, 2,495 forks, 419 open issues and last shipped 2 days ago. Uptime Kuma leads on adoption by 974% (93,190 vs 8,677 stars). Uptime Kuma is written in JavaScript under MIT; alertmanager is written in Go under Apache-2.0. Uptime Kuma has attracted 9% as many forks as stars, alertmanager 29%. Uptime Kuma was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (monitoring), 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
| Uptime Kuma | alertmanager | |
|---|---|---|
| GitHub stars | ★ 93K | ★ 8.7K |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | Go |
| Last push | 2026-11-02 | 2026-11-01 |
| Forks | ⑂ 8.7K | ⑂ 2.5K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Uptime Kuma if
- You weight community size — 93K stars and counting
- You want the MIT license terms
- Your stack matches JavaScript
- You value the larger contributor base for long-term maintenance
pick alertmanager if
- You want the alertmanager 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 alertmanager fits your workflow better
About Uptime Kuma
Uptime Kuma Uptime Kuma is an easy to use self hosted monitoring tool. 🥔 Live Demo Try it! Demo Server (Location: Frankfurt Germany): It is a temporary live demo, all data will be deleted after 10 minutes. Sponsored by Uptime Kuma Sponsors. ⭐ Features Monitoring uptime for HTTP(s) / TCP / HTTP(s) Keyword / HTTP(s) Json Query / Websocket / Ping / DNS Record / Push / Steam Game Server / Docker Containers Fancy, Reactive, Fast UI/UX Notifications via Telegram, Discord, Gotify, Slack, Pushover, Email (SMTP), and 90+ notification services, click here for the full list 20 second intervals Multi Languages Multiple…
read the full Uptime Kuma overview →
About alertmanager
Alertmanager [ ][circleci] [ ][quay] [ ][hub] The Alertmanager handles alerts sent by client applications such as the Prometheus server. It takes care of deduplicating, grouping, and routing them to the correct receiver integrations such as email, PagerDuty, OpsGenie, or many other mechanisms thanks to the webhook receiver. It also takes care of silencing and inhibition of alerts. Documentation Install There are various ways of installing Alertmanager. Precompiled binaries Precompiled binaries for released versions are available in the download section on prometheus.io. Using the latest production release binary…
read the full alertmanager overview →
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Frequently asked questions
Is Uptime Kuma or alertmanager more popular?
Uptime Kuma has 93,190 GitHub stars and alertmanager has 8,677. Uptime Kuma has the larger community by that measure.
Are Uptime Kuma and alertmanager free?
Both are open source. Uptime Kuma is licensed under MIT and alertmanager under Apache-2.0. Neither carries a licence fee.
What is the difference between Uptime Kuma and alertmanager?
Uptime Kuma is written in JavaScript and alertmanager 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, Uptime Kuma or alertmanager?
Choose Uptime Kuma if you want the larger community (93,190 stars) or its MIT licence terms. Choose alertmanager if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.