CatchUI vs JS Visualizer
Neck and neck on boosts. Profiles, pricing and deals below.
A screenshot tool that names every UI element
community boosts
⚡ 0
pricing
Freemium · Free to start · Pro $6/mo
what it is
CatchUI tells you what that UI thing is called. Drop in a screenshot and it names every pattern inside it (bottom sheet, segmented control, toast…) with the evidence for each name, then saves them to your library for spaced-repetition review. Behind it is a curated bilingual (English / 简体中文) catalog of 50 UI patterns, with component names for SwiftUI, UIKit, Compose, Flutter and HTML. The catalog is also a free MCP server: add https://catchui.com/api/mcp to Claude, ChatGPT or Cursor. No sign-up, no API key.
JavaScript Event Loop, Call Stack & Memory Tutorial
community boosts
⚡ 0
pricing
Freemium
what it is
Free interactive JavaScript visualizer. Step through code line-by-line and watch the call stack, Web APIs, microtask queue, event loop, and memory graph come to life. Master async/await, Promises, closures, and the JS runtime.