head to head · open source
SigNoz vs client_java
SigNoz has 32,146 GitHub stars, 2,497 forks, 1,557 open issues and last shipped today. client_java has 2,289 stars, 833 forks, 23 open issues and last shipped today. SigNoz leads on adoption by 1,304% (32,146 vs 2,289 stars). SigNoz is written in TypeScript under a custom or non-standard licence; client_java is written in Java under Apache-2.0. SigNoz has attracted 8% as many forks as stars, client_java 36%. client_java was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (metrics), 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
| SigNoz | client_java | |
|---|---|---|
| GitHub stars | ★ 32K | ★ 2.3K |
| License | Custom / other | Apache-2.0 |
| Written in | TypeScript | Java |
| Last push | 2026-09-20 | 2026-09-20 |
| Forks | ⑂ 2.5K | ⑂ 833 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick SigNoz if
- You weight community size — 32K stars and counting
- You want the Custom / other license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick client_java if
- You want the client_java feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Java
- You evaluated both and client_java fits your workflow better
About SigNoz
SigNoz is an open source, OpenTelemetry native observability platform for cloud native applications. It unifies logs, metrics, traces, alerts, and dashboards into a single tool, replacing fragmented monitoring stacks with a correlated signal pipeline. It lives in the observability ecosystem alongside tools like Prometheus, Jaeger, and Grafana, and is positioned as an open alternative to Datadog.
read the full SigNoz overview →
About client_java
Prometheus instrumentation library for JVM applications — it lets Java services expose metrics that Prometheus scrapes, and it is aimed at Java and JVM developers and the platform, SRE, and observability teams that run Prometheus alongside them.
read the full client_java overview →
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Frequently asked questions
Is SigNoz or client_java more popular?
SigNoz has 32,146 GitHub stars and client_java has 2,289. SigNoz has the larger community by that measure.
Are SigNoz and client_java free?
Both are open source. SigNoz has no licence declared in this registry, and client_java is licensed under Apache-2.0. Both are free to self-host.
What is the difference between SigNoz and client_java?
SigNoz is written in TypeScript and client_java in Java. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, SigNoz or client_java?
Choose SigNoz if you want the larger community (32,146 stars) or its Custom / other licence terms. Choose client_java if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.