head to head · open source
Uptime Kuma vs cost-xray
Uptime Kuma has 91,498 GitHub stars, 8,431 forks, 805 open issues and last shipped yesterday. cost-xray has 2,046 stars, 202 forks, 13 open issues and last shipped 18 days ago. Uptime Kuma leads on adoption by 4,372% (91,498 vs 2,046 stars). Uptime Kuma is written in JavaScript under MIT; cost-xray is written in Python under MIT. Uptime Kuma has attracted 9% as many forks as stars, cost-xray 10%. 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 | cost-xray | |
|---|---|---|
| GitHub stars | ★ 91K | ★ 2.0K |
| License | MIT | MIT |
| Written in | JavaScript | Python |
| Last push | 2026-09-18 | 2026-09-01 |
| Forks | ⑂ 8.4K | ⑂ 202 |
| 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 cost-xray if
- You want the cost-xray feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Python
- You evaluated both and cost-xray 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 cost-xray
cost xray is an MIT licensed open source observability proxy for Claude Code and Codex that captures the API traffic those agents actually send and attributes every token and dollar back to the system prompts, tool schemas, MCP blocks, tool results, cache reads and writes, and thinking blocks that produced them.
read the full cost-xray overview →
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Frequently asked questions
Is Uptime Kuma or cost-xray more popular?
Uptime Kuma has 91,498 GitHub stars and cost-xray has 2,046. Uptime Kuma has the larger community by that measure.
Are Uptime Kuma and cost-xray free?
Both are open source. Uptime Kuma is licensed under MIT and cost-xray under MIT. Neither carries a licence fee.
What is the difference between Uptime Kuma and cost-xray?
Uptime Kuma is written in JavaScript and cost-xray 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 cost-xray?
Choose Uptime Kuma if you want the larger community (91,498 stars) or its MIT licence terms. Choose cost-xray if its feature set, stack or MIT licence fits better. Both are self-hostable.