head to head · open source
effect vs 0xtools
effect has 16,138 GitHub stars, 752 forks, 253 open issues and last shipped today. 0xtools has 1,820 stars, 134 forks, 17 open issues and last shipped 10 months ago. effect leads on adoption by 787% (16,138 vs 1,820 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 | ★ 16K | ★ 1.8K |
| License | MIT | GPL-2.0 |
| Written in | TypeScript | Python |
| Last push | 2026-09-20 | 2025-11-25 |
| Forks | ⑂ 752 | ⑂ 134 |
| 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 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 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 0xtools
0x.Tools is a GPL 2.0 Linux performance and observability toolkit, listed in this registry as Python, that gives engineers an X ray view of what every thread on a running system is actually doing, from kernel space up.
read the full 0xtools overview →
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Frequently asked questions
Is effect or 0xtools more popular?
effect has 16,138 GitHub stars and 0xtools has 1,820. 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 (16,138 stars) or its MIT licence terms. Choose 0xtools if its feature set, stack or GPL-2.0 licence fits better. Both are self-hostable.