head to head · open source
ECC vs msw
ECC has 295,522 GitHub stars, 43,761 forks, 209 open issues and last shipped yesterday. msw has 18,329 stars, 644 forks, 37 open issues and last shipped 17 days ago. ECC leads on adoption by 1,512% (295,522 vs 18,329 stars). ECC is written in JavaScript under MIT; msw is written in TypeScript under MIT. ECC has attracted 15% as many forks as stars, msw 4%. 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 | msw | |
|---|---|---|
| GitHub stars | ★ 296K | ★ 18K |
| License | MIT | MIT |
| Written in | JavaScript | TypeScript |
| Last push | 2026-11-02 | 2026-10-17 |
| Forks | ⑂ 44K | ⑂ 644 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick ECC if
- You weight community size — 296K stars and counting
- You want the MIT license terms
- Your stack matches JavaScript
- You value the larger contributor base for long-term maintenance
pick msw if
- You want the msw feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and msw 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 msw
Mock Service Worker Industry standard API mocking for JavaScript. Join our Discord server Features Seamless . A dedicated layer of requests interception at your disposal. Keep your application's code and tests unaware of whether something is mocked or not. Deviation free . Request the same production resources and test the actual behavior of your app. Augment an existing API, or design it as you go when there is none. Familiar & Powerful . Use Express like routing syntax to intercept requests. Use parameters, wildcards, and regular expressions to match requests, and respond with necessary status codes, headers…
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Frequently asked questions
Is ECC or msw more popular?
ECC has 295,522 GitHub stars and msw has 18,329. ECC has the larger community by that measure.
Are ECC and msw free?
Both are open source. ECC is licensed under MIT and msw under MIT. Neither carries a licence fee.
What is the difference between ECC and msw?
ECC is written in JavaScript and msw 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 msw?
Choose ECC if you want the larger community (295,522 stars) or its MIT licence terms. Choose msw if its feature set, stack or MIT licence fits better. Both are self-hostable.