Your next interview won't wait
Reading solutions feels like progress. Understanding them is progress. Download Algo Mind and step through your first algorithm in the next five minutes.
Algo Mind is the iOS and Android app that teaches you algorithms through interactive, step-by-step visual walkthroughs.
You watch each step play out, synced to the real code, until the pattern finally clicks — then you drill it until it sticks.
It isn't — and somewhere underneath, you already know that. Here's what it actually costs you.
You follow every line, it all makes sense, you close the tab. A week later you couldn't rebuild it from a blank editor — and you're not sure what changed.
Everyone else seems to just see the pattern. You start quietly wondering whether they know something you were never taught — or were never going to get.
Grinding a problem list trains recall, not understanding. That's why the whole thing evaporates the moment an interviewer changes a single constraint.
Keep reading passively and the next rejection won't come down to talent. It'll come down to a pattern you'd seen a dozen times and never actually understood.
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, 100 problems have full interactive walkthroughs like this — 900+ hand-crafted animation steps across arrays, trees, graphs, stacks, matrices, DP tables, and more.
Everything in Algo Mind does one of three jobs, so you always know which one you need right now.
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. The latest release adds new animated walkthroughs and smoother, clearer motion throughout.
Problems ship with working implementations in Python and Kotlin — and across most of the practice library, Java and C++ too. On visualized problems, the exact lines being executed highlight in sync with each step — no guessing how the picture maps to the code.
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. Home shows where you are in the journey at a glance, with the full path one tap away.
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.
Set the date once and Home counts it down for you — twelve weeks out, tomorrow, or today. It turns a vague "I should prepare" into a number you can plan around. No date yet? It stays quietly out of your way.
Daily streaks, XP, a daily challenge, per-topic mastery, and bookmarks for the problems that trip you up. Bit — your companion on Home and Profile — reflects your streak back at you, lighting one of six chest circuits for every day you keep it going. Daily reminders nudge you back, and your progress follows you to every device.
From the Big O Growth Guide to the Binary Search Variation Guide and Monotonic Stacks — 175 sections of curated reference across Fundamentals, Data Structures, and Patterns.
From your first array scan to backtracking and bit manipulation. Easy, Medium, and Hard problems, all with full explanations, examples, and complexity analysis.
No account to create, no card to enter, nothing to set up.
Get Algo Mind from the App Store or Google Play. Free to start, no credit card.
Pick any algorithm and step through it at your own pace, with the matching code lines lighting up as it runs.
Rebuild it as a fill-in-the-blank puzzle, then drill the same pattern across the problem library.
Most people get through step 2 in under five minutes.
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.
Algo Mind is a mobile app for iOS and Android that teaches data structures and algorithms through interactive, step-by-step visualizations synced to real code. It includes 100 visual walkthroughs, a 1,576-problem coding-interview practice library across 17 topics, 176 fill-in-the-blank code puzzles, and 21 cheatsheets, with solutions in Python, Java, Kotlin, and C++.
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. An optional Premium subscription unlocks the full library (all 17 topics, 1,576 problems, 100 walkthroughs, 176 puzzles, and 21 cheatsheets). Current pricing — and any free trial or introductory offer — is shown in the app before you subscribe and can vary by country.
LeetCode tests whether you can solve a problem. Algo Mind teaches you to understand it. The core patterns come as interactive visualizations that show what the algorithm does at each step, with the matching code lines highlighted in sync. Practice modes — step sequencing, true/false checks, and fill-in-the-blank code puzzles — verify the understanding actually stuck, and a 1,576-problem library lets you apply it at interview scale.
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, and most of the practice library adds Java and C++ as well. On visualized problems, the code is synced line-by-line with the animation.
Yes — Algo Mind is available on both platforms: the App Store for iPhone and iPad, and Google Play for Android. Both versions are built from the same codebase, so content and features stay in sync.