head to head · open source
Uptime Kuma vs viztracer
Uptime Kuma has 91,477 GitHub stars, 8,426 forks, 805 open issues and last shipped yesterday. viztracer has 7,743 stars, 475 forks, 33 open issues and last shipped yesterday. Uptime Kuma leads on adoption by 1,081% (91,477 vs 7,743 stars). Uptime Kuma is written in JavaScript under MIT; viztracer is written in Python under Apache-2.0. Uptime Kuma has attracted 9% as many forks as stars, viztracer 6%. 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 | viztracer | |
|---|---|---|
| GitHub stars | ★ 91K | ★ 7.7K |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | Python |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 8.4K | ⑂ 475 |
| 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 viztracer if
- You want the viztracer feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Python
- You evaluated both and viztracer 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 viztracer
VizTracer is a low overhead Python tracing, debugging and profiling tool that records code execution and renders it as an interactive timeline with source code, built for Python developers who need to see what their scripts, threads, subprocesses, async tasks and PyTorch calls are actually doing.
read the full viztracer overview →
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Frequently asked questions
Is Uptime Kuma or viztracer more popular?
Uptime Kuma has 91,477 GitHub stars and viztracer has 7,743. Uptime Kuma has the larger community by that measure.
Are Uptime Kuma and viztracer free?
Both are open source. Uptime Kuma is licensed under MIT and viztracer under Apache-2.0. Neither carries a licence fee.
What is the difference between Uptime Kuma and viztracer?
Uptime Kuma is written in JavaScript and viztracer in Python. 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 viztracer?
Choose Uptime Kuma if you want the larger community (91,477 stars) or its MIT licence terms. Choose viztracer if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.