Every one of our 89 problems comes with an interactive, step-by-step visualization synced to real code. Stop re-reading solutions you'll forget — watch them work until they click.
This is the core of Algo Mind: watch the algorithm work, one step at a time. Here's bubble sort — see the biggest values bubble to the end. Press play.
In the app, all 89 problems work like this — with 900+ hand-crafted animation steps across arrays, trees, graphs, stacks, matrices, DP tables, and more.
Visual walkthroughs to learn the idea, three practice modes to make it stick, and cheatsheets for the night before.
Play, pause, scrub, and change speed through 11 kinds of visualizations — arrays, linked lists, trees, graphs, stacks, matrices, DP tables, sliding windows, backtracking trees, and more.
Every problem ships with working Python and Kotlin implementations. The exact lines being executed highlight in sync with each visualization step — no guessing how the picture maps to the code.
Rebuild real solutions by filling in the missing pieces of code, with hints when you're stuck. The fastest way to find out whether you actually understood — or just nodded along.
Re-order the steps of an algorithm, answer true/false checks on the tricky details, pick the right complexity — or mix them all in a quick 5, 10, or 15-problem session.
The Core Curriculum walks you through 8 ordered chapters — from Big O foundations to dynamic programming — mixing lessons, cheatsheets, and practice so each idea builds on the last.
Daily streaks, XP, a daily challenge, per-topic mastery, and bookmarks for the problems that trip you up. Know exactly what you've mastered and what needs another pass.
From your first array scan to backtracking and bit manipulation. Easy, Medium, and Hard problems, all with full explanations, examples, and complexity analysis.
No credit card needed to start learning. Premium unlocks the full library when you're ready to go deeper.
Learn the fundamentals, build the habit.
Everything, unlocked from day one.
Reading solutions feels like progress. Understanding them is progress. Download Algo Mind and step through your first algorithm in the next five minutes.
Everything you need to know before getting started.
Free to download and free to start learning — no credit card required. You can work through the early curriculum and unlock more topics as you solve. Premium unlocks the full library (all 17 topics, 89 walkthroughs, 176 puzzles, and 21 cheatsheets) and comes with a 7-day free trial you can cancel anytime.
LeetCode tests whether you can solve a problem. Algo Mind teaches you to understand it. Every problem here has an interactive visualization that shows what the algorithm does at each step, with the matching code lines highlighted in sync. Then practice modes — step sequencing, true/false checks, and fill-in-the-blank code puzzles — verify the understanding actually stuck.
That's exactly who the Core Curriculum is for. It starts with Big O and recursion fundamentals, then builds chapter by chapter through arrays, two pointers, stacks, binary search, sliding window, linked lists, trees, and into sorting and dynamic programming. Each idea builds on the previous one.
Every problem includes complete, syntax-highlighted implementations in Python and Kotlin, both synced line-by-line with the visualizations. More languages are planned.
Android is available now on Google Play. The iOS version is built on the same codebase and is coming to the App Store soon.