head to head · open source
jaeger vs effect
jaeger has 23,366 GitHub stars, 3,220 forks, 547 open issues and last shipped 2 days ago. effect has 17,464 stars, 892 forks, 253 open issues and last shipped 2 days ago. jaeger leads on adoption by 34% (23,366 vs 17,464 stars). jaeger is written in Go under Apache-2.0; effect is written in TypeScript under MIT. jaeger has attracted 14% as many forks as stars, effect 5%. effect was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (observability, opentelemetry), 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
| jaeger | effect | |
|---|---|---|
| GitHub stars | ★ 23K | ★ 17K |
| License | Apache-2.0 | MIT |
| Written in | Go | TypeScript |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 3.2K | ⑂ 892 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick jaeger if
- You weight community size — 23K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Go
- You value the larger contributor base for long-term maintenance
pick effect if
- You want the effect feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and effect fits your workflow better
About jaeger
[![Slack chat][slack img]]( get in touch) [![Unit Tests][ci img]][ci] [![Coverage Status][cov img]][cov] [![Project+Community stats][community badge]][community stats] [![FOSSA Status][fossa img]][fossa] [![OpenSSF Scorecard][openssf img]][openssf] [![OpenSSF Best Practices][openssf bp img]][openssf bp] [![CLOMonitor][clomonitor img]][clomonitor] [![Artifact Hub][artifacthub img]][artifacthub] Jaeger a Distributed Tracing System 💥💥💥 Jaeger v2 is out! Read the blog post and try it out. Quick Start Get Jaeger running in seconds with Docker: For production deployments and more options, see the Getting Started…
read the full jaeger overview →
About effect
Effect Effect is a library for building robust, maintainable, type safe, and production grade applications in TypeScript. It helps you handle the hard problems at scale: typed errors, dependency injection, structured concurrency, scheduling, tracing, and unified schema validation. Effect V4 is currently a release candidate. The main branch contains v4 development. Install V4 RC Requirements TypeScript 5.9 or newer. TypeScript 7 is recommended for the best performance and compatibility with Effect's TypeScript tooling. Node.js 18 or newer is the general minimum for running Effect on Node.js. Some integration…
read the full effect overview →
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Frequently asked questions
Is jaeger or effect more popular?
jaeger has 23,366 GitHub stars and effect has 17,464. jaeger has the larger community by that measure.
Are jaeger and effect free?
Both are open source. jaeger is licensed under Apache-2.0 and effect under MIT. Neither carries a licence fee.
What is the difference between jaeger and effect?
jaeger is written in Go and effect in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, jaeger or effect?
Choose jaeger if you want the larger community (23,366 stars) or its Apache-2.0 licence terms. Choose effect if its feature set, stack or MIT licence fits better. Both are self-hostable.