head to head · open source
effect vs btrace
effect has 16,138 GitHub stars, 752 forks, 253 open issues and last shipped today. btrace has 5,995 stars, 956 forks, 6 open issues and last shipped yesterday. effect leads on adoption by 169% (16,138 vs 5,995 stars). effect is written in TypeScript under MIT; btrace is written in Java under Apache-2.0. effect has attracted 5% as many forks as stars, btrace 16%. effect was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (observability), 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
| effect | btrace | |
|---|---|---|
| GitHub stars | ★ 16K | ★ 6.0K |
| License | MIT | Apache-2.0 |
| Written in | TypeScript | Java |
| Last push | 2026-09-20 | 2026-09-19 |
| Forks | ⑂ 752 | ⑂ 956 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick effect if
- You weight community size — 16K stars and counting
- You want the MIT license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick btrace if
- You want the btrace 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 btrace fits your workflow better
About effect
Effect is a TypeScript library for building robust, maintainable, type safe, and production grade applications. It lives in the TypeScript and JavaScript ecosystem, distributed as the core effect package alongside a monorepo of integration packages that extend it. The project is MIT licensed, has been developed for roughly seven years, and currently ships Effect V4 as a release candidate, with the main branch holding v4 development and the v3 branch retaining the previous line.
read the full effect overview →
About btrace
BTrace is an open source dynamic tracing and diagnostics tool for Java applications, distributed under the Apache 2.0 license and maintained in the Java and JVM ecosystem. It works by attaching to a running Java Virtual Machine and dynamically instrumenting bytecode at runtime, injecting tracing code into classes that are already loaded. The project sits in the Infrastructure & Operations / Monitoring & Observability category and carries the topics tracing, observability, diagnostics, profiling, bytecode instrumentation, runtime instrumentation, java agent and dtrace.
read the full btrace overview →
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Frequently asked questions
Is effect or btrace more popular?
effect has 16,138 GitHub stars and btrace has 5,995. effect has the larger community by that measure.
Are effect and btrace free?
Both are open source. effect is licensed under MIT and btrace under Apache-2.0. Neither carries a licence fee.
What is the difference between effect and btrace?
effect is written in TypeScript and btrace 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, effect or btrace?
Choose effect if you want the larger community (16,138 stars) or its MIT licence terms. Choose btrace if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.