head to head · open source
effect vs 0xtools
effect has 17,476 GitHub stars, 895 forks, 253 open issues and last shipped yesterday. 0xtools has 1,826 stars, 134 forks, 17 open issues and last shipped 12 months ago. effect leads on adoption by 857% (17,476 vs 1,826 stars). effect is written in TypeScript under MIT; 0xtools is written in Python under GPL-2.0. effect has attracted 5% as many forks as stars, 0xtools 7%. 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 | 0xtools | |
|---|---|---|
| GitHub stars | ★ 17K | ★ 1.8K |
| License | MIT | GPL-2.0 |
| Written in | TypeScript | Python |
| Last push | 2026-11-04 | 2025-11-25 |
| Forks | ⑂ 895 | ⑂ 134 |
| 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 0xtools if
- You want the 0xtools feature set and don't need the biggest community
- You prefer the GPL-2.0 license terms
- Your stack matches Python
- You evaluated both and 0xtools 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 0xtools
xCapture v3.0.3 By Tanel Poder 2025 10 23 This is the first ever release of 0x.tools xCapture tool that is built with modern eBPF ! My previous tools and prototypes were using either bcc , bpftrace or were just sampling and aggregating thread level info from /proc files. Announcing xCapture v3: Linux Performance Analysis with Modern eBPF and DuckDB xtop: Dimensional Performance Analysis of Sampled Thread Activity Requirements Modern eBPF means libbpf , CORE , BTF , BPF iterators , etc. I'll write about my learning journey with proper thank you notes soon. In practice this means you'll need to be on a Linux…
read the full 0xtools overview →
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Frequently asked questions
Is effect or 0xtools more popular?
effect has 17,476 GitHub stars and 0xtools has 1,826. effect has the larger community by that measure.
Are effect and 0xtools free?
Both are open source. effect is licensed under MIT and 0xtools under GPL-2.0. Neither carries a licence fee.
What is the difference between effect and 0xtools?
effect is written in TypeScript and 0xtools in Python. 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 0xtools?
Choose effect if you want the larger community (17,476 stars) or its MIT licence terms. Choose 0xtools if its feature set, stack or GPL-2.0 licence fits better. Both are self-hostable.