head to head · open source
ECC vs Onlook
ECC has 296,647 GitHub stars, 43,867 forks, 225 open issues and last shipped 3 days ago. Onlook has 27,108 stars, 2,139 forks, 380 open issues and last shipped 15 days ago. ECC leads on adoption by 994% (296,647 vs 27,108 stars). ECC is written in JavaScript under MIT; Onlook is written in TypeScript under Apache-2.0. ECC has attracted 15% as many forks as stars, Onlook 8%. ECC was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (claude-code), 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
| ECC | Onlook | |
|---|---|---|
| GitHub stars | ★ 297K | ★ 27K |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | TypeScript |
| Last push | 2026-11-02 | 2026-10-21 |
| Forks | ⑂ 44K | ⑂ 2.1K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick ECC if
- You weight community size — 297K stars and counting
- You want the MIT license terms
- Your stack matches JavaScript
- You value the larger contributor base for long-term maintenance
pick Onlook if
- You want the Onlook feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches TypeScript
- You evaluated both and Onlook fits your workflow better
About ECC
Language: English العربية Português (Brasil) 简体中文 繁體中文 日本語 한국어 Türkçe Русский Tiếng Việt ไทย Deutsch Español Українська Polski বাংলা [!WARNING] Official sources only. Install ECC only from verified channels: the GitHub repository github.com/affaan m/ECC, the npm packages ecc universal and ecc agentshield , the GitHub App, the plugin slug ecc@ecc , and the project website ecc.tools. Third party re uploads and unofficial mirrors are not maintained or reviewed by the project and may contain malware. Install with Claude Code Use the guided setup or native plugin commands. Both install the same ecc@ecc plugin. Choose…
About Onlook
Onlook The design tool for AI native designers — now in early access. Onlook makes designing on top of your codebase effortless. Craft exceptional experiences with AI in code. → Join the waitlist 👨💻👩💻👨💻 We're hiring engineers in SF! 👩💻👨💻👩💻 View Demo · Report Bug · Request Feature [![Discord][discord shield]][discord url] [![LinkedIn][linkedin shield]][linkedin url] [![Twitter][twitter shield]][twitter url] 中文 Español Deutsch français Português Русский 日本語 한국어 This is the open source visual editor that started Onlook (Next.js + Tailwind). The hosted product we're building next, for AI native…
read the full Onlook overview →
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Frequently asked questions
Is ECC or Onlook more popular?
ECC has 296,647 GitHub stars and Onlook has 27,108. ECC has the larger community by that measure.
Are ECC and Onlook free?
Both are open source. ECC is licensed under MIT and Onlook under Apache-2.0. Neither carries a licence fee.
What is the difference between ECC and Onlook?
ECC is written in JavaScript and Onlook in TypeScript. 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 Onlook?
Choose ECC if you want the larger community (296,647 stars) or its MIT licence terms. Choose Onlook if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.