head to head · open source
Uptime Kuma vs viztracer
Uptime Kuma has 93,190 GitHub stars, 8,655 forks, 805 open issues and last shipped yesterday. viztracer has 7,772 stars, 480 forks, 33 open issues and last shipped 1 months ago. Uptime Kuma leads on adoption by 1,099% (93,190 vs 7,772 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 | ★ 93K | ★ 7.8K |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | Python |
| Last push | 2026-11-02 | 2026-09-26 |
| Forks | ⑂ 8.7K | ⑂ 480 |
| 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 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 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 viztracer
VizTracer VizTracer is a low overhead logging/debugging/profiling tool that can trace and visualize your python code execution. The front end UI is powered by Perfetto. Use "AWSD" to zoom/navigate . More help can be found in "Support Controls". Highlights Detailed function entry/exit information on timeline with source code Super easy to use, no source code change for most features, no package dependency Low overhead, probably the fastest tracer in the market Supports threading, multiprocessing, subprocess, async and PyTorch Powerful front end, able to render GB level trace smoothly Works on Linux/MacOS/Windows…
read the full viztracer overview →
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Frequently asked questions
Is Uptime Kuma or viztracer more popular?
Uptime Kuma has 93,190 GitHub stars and viztracer has 7,772. 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 (93,190 stars) or its MIT licence terms. Choose viztracer if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.