head to head · open source
Uptime Kuma vs semantic_logger
Uptime Kuma has 93,190 GitHub stars, 8,655 forks, 805 open issues and last shipped yesterday. semantic_logger has 956 stars, 140 forks, 0 open issues and last shipped 4 days ago. Uptime Kuma leads on adoption by 9,648% (93,190 vs 956 stars). Uptime Kuma is written in JavaScript under MIT; semantic_logger is written in Ruby under Apache-2.0. Uptime Kuma has attracted 9% as many forks as stars, semantic_logger 15%. 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 | semantic_logger | |
|---|---|---|
| GitHub stars | ★ 93K | ★ 956 |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | Ruby |
| Last push | 2026-11-02 | 2026-10-30 |
| Forks | ⑂ 8.7K | ⑂ 140 |
| 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 semantic_logger if
- You want the semantic_logger feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Ruby
- You evaluated both and semantic_logger 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 semantic_logger
Semantic Logger Semantic Logger is a high performance, asynchronous structured logging framework for Ruby and Rails. It differs from ordinary loggers in two important ways: 1. It logs structured data, not just strings. Along with the text message, each log entry can carry a payload (any Hash), an exception, a duration, metrics, and tags. That data is preserved all the way to the destination, so it stays searchable instead of being flattened into text. 2. It logs asynchronously. Log events are pushed onto an in memory queue and written to their destinations by a separate background thread, so your application is…
read the full semantic_logger overview →
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Frequently asked questions
Is Uptime Kuma or semantic_logger more popular?
Uptime Kuma has 93,190 GitHub stars and semantic_logger has 956. Uptime Kuma has the larger community by that measure.
Are Uptime Kuma and semantic_logger free?
Both are open source. Uptime Kuma is licensed under MIT and semantic_logger under Apache-2.0. Neither carries a licence fee.
What is the difference between Uptime Kuma and semantic_logger?
Uptime Kuma is written in JavaScript and semantic_logger in Ruby. 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 semantic_logger?
Choose Uptime Kuma if you want the larger community (93,190 stars) or its MIT licence terms. Choose semantic_logger if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.