LeechBoard 作成者: DrunkTrader

Leechboard is a local-first browser extension that puts a focused, Excalidraw-like whiteboard beside coding problems on LeetCode, CodeChef, and Codeforces.

It is designed for the moment when a solution needs a quick sketch: draw a graph, annotate a recurrence, trace an array, or leave a note for later. Boards are isolated per problem and stored in the browser profile. No account, backend, analytics, or remote content is required.

Author: drunktrader

• Chrome and Firefox MV3 builds from one TypeScript codebase.
• A Shadow DOM overlay that does not modify the host site's layout.
• Freehand strokes, lines, arrows, rectangles, ellipses, text, sticky notes, and semantic DSA components.
• Reusable components for arrays, linked lists, stacks, queues, binary trees, graphs, pointers, and complexity notes.
• Per-problem autosave, restore, delete, import, and export.
• Separate board identity for each supported problem URL, including Codeforces contest/gym routes and CodeChef contest routes.
• Keyboard-first controls, visible focus, reduced-motion support, and a polite save-status announcement.
• Local-only privacy posture with minimal permissions.