ECMA.app
The JS/TS playground that shows what your code does.
ECMA.app launched on April 26, 2025 with 17 votes, #1,302 of 7,818 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 1 year on.
What it does
ECMA.app is a web-based JavaScript & TypeScript playground that shows your code’s behavior in real-time. Track console logs visually, explore types, debug in a safer sandboxed environment — no setup, no noise, just code.
Explore and debug JavaScript and TypeScript code in real time with ecma.app. Perfect for developers who want to write, test, and learn interactively. Try it now for free!
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