Watch algorithms think.
AlgorAI teaches data structures, algorithms and AI with interactive labs you step through one move at a time, then gets you ready for coding and machine learning interviews. Fully offline, no account needed.
↳ The phone is live — press play, scrub or step through it.Stop memorising. Start seeing.
Every concept is a short simulation you control — no walls of text, no guessing what the pointer did.
Pick a topic
From linked lists to attention, choose the idea you need for your next interview.
Step through it
Play, pause, scrub or tap forward one move at a time, with a plain-English caption on every step.
Explain it with confidence
When you can watch it run, you can talk through it. Walk in knowing what the code does.
Watch Dijkstra find the way.
Pop the closest node, relax its edges, repeat. Step through it and the shortest-path tree builds in front of you. BFS, DFS and topological sort work the same way.
From arrays to attention.
Two tracks, DSA and AI, with 504 topics. Every topic has the same shape: a plain-language intro, a step-by-step walkthrough, the maths written out, complete code, an interactive lab, real-world uses and key takeaways.
Data structures
Arrays, strings, linked lists, stacks, queues, hash tables, trees, heaps, tries, graphs and disjoint sets.
Algorithms
Sorting, searching, recursion, dynamic programming, greedy, backtracking, shortest paths and string matching.
Complexity analysis
Big-O, amortised analysis, recurrences and space/time trade-offs, counted live.
Coding patterns
57 pattern guides: sliding window, two pointers, merge intervals, monotonic stack, union-find.
Machine learning
Regression, classification, clustering, trees and ensembles, and model evaluation.
Deep learning
Backpropagation, CNNs, RNNs, transformers and diffusion models.
NLP and LLMs
Tokenisation, embeddings, attention, RAG, fine-tuning and agents.
Reinforcement learning
Bandits, Q-learning, policy gradients, DQN and PPO.
Practise the round, not just the topic.
For students, self-learners, campus placements and software engineer, data scientist or ML engineer interviews. Every answer explains the solution, its complexity and why the tempting wrong answer fails.
Timed quizzes
453 questions under a real countdown clock, from beginner rounds to hard classics like trapping rain water.
Coding problems
Grouped by pattern, with progressive hints, a walk-through and a full Kotlin solution.
Pattern guides
Sliding window, two pointers, backtracking and more, each with its own lab.
AI interview rounds
NLP, LLM and GenAI engineering, computer vision, recommender systems, and AI in healthcare, finance and retail.
Behavioural questions
With STAR guidance, plus system design and ML system design primers.
Flashcards
Every missed question comes back on an SM-2 schedule, and a weak-spot drill targets the patterns you miss most.
Poke it. It pokes back.
Scrub every iteration.
Drag through k-means as the centroids settle. Every lab has the same scrubber.
See what each word attends to.
Tap a token to reveal its attention weights across the sentence.
Feel the learning rate.
Pick a rate and watch the optimizer converge — or overshoot.
Questions, answered.
What is AlgorAI?
AlgorAI is a learning app for data structures, algorithms and artificial intelligence. Every one of its 504 topics comes with an interactive lab you can play, pause and step through, plus interview practice: timed quizzes, coding problems and pattern guides. It runs on Android and iPhone.
Is AlgorAI free?
AlgorAI is free to download, and a dozen intro lessons are always open. On Android, watching a rewarded ad opens a further selection of lessons for 6 hours. Premium unlocks every lesson, lab, quiz and interview round.
Does AlgorAI work offline?
Yes. All lessons, labs, quizzes and flashcards are bundled in the app, so you can study on a commute or with data switched off. There is no account, no sign-in and no server; your progress stays on your device.
What programming languages does AlgorAI use?
Topic lessons show code in Kotlin, Python, Java and JavaScript. The 102 coding problems each come with progressive hints, a walk-through and a full Kotlin solution.
Can AlgorAI help me prepare for coding interviews?
Yes. It has 54 timed quizzes with 453 questions, 102 coding problems grouped by pattern, 57 coding pattern guides, AI and machine learning interview rounds, system design primers and 20 behavioural questions with STAR guidance. Every answer explains the solution, its complexity and why the tempting wrong answer fails.
What AI and machine learning topics does AlgorAI cover?
Machine learning (regression, classification, clustering, trees and ensembles, model evaluation), deep learning (backpropagation, CNNs, RNNs, transformers, diffusion models), NLP and LLMs (tokenisation, embeddings, attention, RAG, fine-tuning, agents) and reinforcement learning (bandits, Q-learning, policy gradients, DQN, PPO).
Your next interview, step by step.
Available on iPhone and Android.