head to head · open source
effect vs metrics
effect has 17,464 GitHub stars, 892 forks, 253 open issues and last shipped yesterday. metrics has 17,365 stars, 2,300 forks, 68 open issues and last shipped 5 months ago. effect leads on adoption by 1% (17,464 vs 17,365 stars). effect is written in TypeScript under MIT; metrics is written in JavaScript under MIT. effect has attracted 5% as many forks as stars, metrics 13%. effect was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (javascript), 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.
← all 20902 open source comparisons
Side by side
| effect | metrics | |
|---|---|---|
| GitHub stars | ★ 17K | ★ 17K |
| License | MIT | MIT |
| Written in | TypeScript | JavaScript |
| Last push | 2026-11-02 | 2026-05-29 |
| Forks | ⑂ 892 | ⑂ 2.3K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick effect if
- You weight community size — 17K stars and counting
- You want the MIT license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick metrics if
- You want the metrics feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches JavaScript
- You evaluated both and metrics fits your workflow better
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 →
About metrics
📊 Metrics Generate metrics that can be embedded everywhere, including your GitHub profile readme! Supports users, organizations, and even repositories! For user accounts For organization accounts 🧩 Customizable with 47 plugins and 335 options! 📅 Isometric commit calendar 🈷️ Languages activity Full year calendar Half year calendar Indepth analysis (clone and analyze repositories) Recently used (analyze recent activity events) Default algorithm Default algorithm (with details) ✨ Stargazers 👨💻 Lines of code changed Classic charts Graph charts Worldmap Repositories and diff history Compact display in base…
read the full metrics overview →
More in Infrastructure & Operations
Related comparisons
More Monitoring & Observability projects
Compare either of these against the rest of the Monitoring & Observability field.
Frequently asked questions
Is effect or metrics more popular?
effect has 17,464 GitHub stars and metrics has 17,365. effect has the larger community by that measure.
Are effect and metrics free?
Both are open source. effect is licensed under MIT and metrics under MIT. Neither carries a licence fee.
What is the difference between effect and metrics?
effect is written in TypeScript and metrics in JavaScript. 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 metrics?
Choose effect if you want the larger community (17,464 stars) or its MIT licence terms. Choose metrics if its feature set, stack or MIT licence fits better. Both are self-hostable.