head to head · open source
ECC vs validator
ECC has 273,125 GitHub stars, 40,766 forks, 345 open issues and last shipped today. validator has 1,988 stars, 336 forks, 0 open issues and last shipped 3 days ago. ECC leads on adoption by 13,639% (273,125 vs 1,988 stars). ECC is written in JavaScript under MIT; validator is written in Java under MIT. ECC has attracted 15% as many forks as stars, validator 17%. ECC 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
| ECC | validator | |
|---|---|---|
| GitHub stars | ★ 273K | ★ 2.0K |
| License | MIT | MIT |
| Written in | JavaScript | Java |
| Last push | 2026-10-05 | 2026-10-02 |
| Forks | ⑂ 41K | ⑂ 336 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick ECC if
- You weight community size — 273K stars and counting
- You want the MIT license terms
- Your stack matches JavaScript
- You value the larger contributor base for long-term maintenance
pick validator if
- You want the validator feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Java
- You evaluated both and validator fits your workflow better
About ECC
ECC is an MIT licensed open source agent harness performance optimization system that gives AI coding agents a coordinated engineering workflow — plan, test, implement, review, verify, remember, improve — for developers working in Claude Code, Codex, OpenCode, Cursor, and other harnesses.
About validator
The Nu Html Checker (vnu) is an MIT licensed Java tool and HTTP service for catching mistakes in HTML, CSS, and SVG documents, aimed at developers who want command line, scripted, or self hosted web standards validation.
read the full validator overview →
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Frequently asked questions
Is ECC or validator more popular?
ECC has 273,125 GitHub stars and validator has 1,988. ECC has the larger community by that measure.
Are ECC and validator free?
Both are open source. ECC is licensed under MIT and validator under MIT. Neither carries a licence fee.
What is the difference between ECC and validator?
ECC is written in JavaScript and validator in Java. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, ECC or validator?
Choose ECC if you want the larger community (273,125 stars) or its MIT licence terms. Choose validator if its feature set, stack or MIT licence fits better. Both are self-hostable.