head to head · open source
Uptime Kuma vs Zabbix
Uptime Kuma has 91,477 GitHub stars, 8,426 forks, 805 open issues and last shipped yesterday. Zabbix has 6,382 stars, 1,259 forks, 108 open issues and last shipped 2 days ago. Uptime Kuma leads on adoption by 1,333% (91,477 vs 6,382 stars). Uptime Kuma is written in JavaScript under MIT; Zabbix is written in Go Template under AGPL-3.0. Uptime Kuma has attracted 9% as many forks as stars, Zabbix 20%. 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 | Zabbix | |
|---|---|---|
| GitHub stars | ★ 91K | ★ 6.4K |
| License | MIT | AGPL-3.0 |
| Written in | JavaScript | Go Template |
| Last push | 2026-09-17 | 2026-09-16 |
| Forks | ⑂ 8.4K | ⑂ 1.3K |
| 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 Zabbix if
- You want the Zabbix feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches Go Template
- You evaluated both and Zabbix 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 Zabbix
Zabbix is an enterprise class, open source distributed monitoring solution that measures the performance and availability of network devices, servers, services, and other IT resources. The project lives in the open source infrastructure monitoring and observability ecosystem, and its source is distributed under the AGPL 3.0 only license, with the repository carrying 6,374 stars and 1,255 forks. It is written using Go Template and is hosted by the Zabbix project at zabbix.com, where the download and documentation entry points are published. The stated scope runs from a simple standalone application through to a la…
read the full Zabbix overview →
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Frequently asked questions
Is Uptime Kuma or Zabbix more popular?
Uptime Kuma has 91,477 GitHub stars and Zabbix has 6,382. Uptime Kuma has the larger community by that measure.
Are Uptime Kuma and Zabbix free?
Both are open source. Uptime Kuma is licensed under MIT and Zabbix under AGPL-3.0. Neither carries a licence fee.
What is the difference between Uptime Kuma and Zabbix?
Uptime Kuma is written in JavaScript and Zabbix in Go Template. 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 Zabbix?
Choose Uptime Kuma if you want the larger community (91,477 stars) or its MIT licence terms. Choose Zabbix if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.