head to head · open source
esbuild vs pytest-testmon
esbuild has 40,120 GitHub stars, 1,368 forks, 622 open issues and last shipped 3 months ago. pytest-testmon has 1,034 stars, 87 forks, 38 open issues and last shipped 2 days ago. esbuild leads on adoption by 3,780% (40,120 vs 1,034 stars). esbuild is written in Go under MIT; pytest-testmon is written in Python under MIT. esbuild has attracted 3% as many forks as stars, pytest-testmon 8%. pytest-testmon was the more recently maintained of the two, and both are self-hostable with no licence fee.
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
| esbuild | pytest-testmon | |
|---|---|---|
| GitHub stars | ★ 40K | ★ 1.0K |
| License | MIT | MIT |
| Written in | Go | Python |
| Last push | 2026-08-09 | 2026-11-02 |
| Forks | ⑂ 1.4K | ⑂ 87 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick esbuild if
- You weight community size — 40K stars and counting
- You want the MIT license terms
- Your stack matches Go
- You value the larger contributor base for long-term maintenance
pick pytest-testmon if
- You want the pytest-testmon feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Python
- You evaluated both and pytest-testmon fits your workflow better
About esbuild
Website Getting started Documentation Plugins FAQ Why? Our current build tools for the web are 10 100x slower than they could be: The main goal of the esbuild bundler project is to bring about a new era of build tool performance, and create an easy to use modern bundler along the way. Major features: Extreme speed without needing a cache JavaScript, CSS, TypeScript, and JSX built in A straightforward API for CLI, JS, and Go Bundles ESM and CommonJS modules Bundles CSS including CSS modules Tree shaking, minification, and source maps Local server, watch mode, and plugins Check out the getting started instructions…
read the full esbuild overview →
About pytest-testmon
This is a pytest plug in which automatically selects and re executes only tests affected by recent changes. How is this possible in dynamic language like Python and how reliable is it? Read here: Determining affected tests Quickstart pip install pytest testmon build the dependency database and save it to .testmondata pytest testmon change some of your code (with test coverage) only run tests affected by recent changes pytest testmon To learn more about different options you can use with testmon, please head to testmon.org Call for opensource projects: try testmon in CI with no effort or risk. We would like to…
read the full pytest-testmon overview →
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Frequently asked questions
Is esbuild or pytest-testmon more popular?
esbuild has 40,120 GitHub stars and pytest-testmon has 1,034. esbuild has the larger community by that measure.
Are esbuild and pytest-testmon free?
Both are open source. esbuild is licensed under MIT and pytest-testmon under MIT. Neither carries a licence fee.
What is the difference between esbuild and pytest-testmon?
esbuild is written in Go and pytest-testmon 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, esbuild or pytest-testmon?
Choose esbuild if you want the larger community (40,120 stars) or its MIT licence terms. Choose pytest-testmon if its feature set, stack or MIT licence fits better. Both are self-hostable.