Free DSA Learning Hub
Built this because I kept needing a quick sprite sheet tool while working on side projects and everything either required a download or had a paywall. It runs fully in the browser, no upload to a server, no login. Supports: - Packer mode: upload separate frame PNGs, reorder them, export as atlas + JSON - Slicer mode: upload an existing sheet, define rows/columns, split into frames - JSON metadata compatible with Phaser, custom WebGL renderers etc. Works with Unity and Godot workflows too. Would love feedback on what's missing.
Free DSA Learning Hub launched on November 19, 2025 with 9 votes, #1,143 of 9,796 launches that month and more than 50% of that year's launches.
What it does
Learn DSA the modern way, with interactive visualizations, step-by-step animations, and practice-driven explanations. Jaconir DSA turns complex algorithms into easy-to-understand visuals, helping students and beginners truly see how data structures work under the hood. Explore concepts with guided walk-throughs, hands-on examples, and instant practice problems, all 100% free. Perfect for interview prep, college students, and anyone learning DSA from scratch.
Learn DSA for 2026 interviews: foundations, two pointers, sliding window, graphs, and DP. Progress in your browser. 100% free, no signup.
Pattern-first path for 2026 interviews. Progress stays in this browser. Four tracks, top to bottom. Every node is a lesson — no pan-zoom graphic. How to measure cost, then the structures every later pattern sits on. The 2026 interview loop: recognize the shape, name the pattern, write the bound. Trees, graphs, union-find, then 1D/2D dynamic programming and greedy. Pattern-grouped practice loops for intern vs senior — original prompts, no branded lists. Beginners who need a sequence, and people prepping interviews who want pattern names, complexity, and intern vs senior signal — without an account. Yes, free. Progress is stored in this browser with localStorage. No signup, no cloud sync.…from jaconir.online
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