AlgorAI: DSA, AI & Interviews

Learn data structures, algorithms and AI through interactive labs, then prepare for coding and machine learning interviews. AlgorAI is a visual computer science course and an interview-prep app in one, and it works fully offline. Most apps hand you a wall of text. AlgorAI hands you the thing itself: a linked list you can insert into, a graph you can run BFS across, a regression line you can tune with sliders until the error stops shrinking. 504 topics, each with an interactive lab. LEARN DSA — DATA STRUCTURES AND ALGORITHMS • Data structures: arrays, strings, linked lists, stacks, queues, hash tables, trees, heaps, tries, graphs, disjoint sets, B-trees and more • Algorithms: sorting, searching, recursion, dynamic programming, greedy, backtracking, graph traversal, shortest paths, string matching • Complexity analysis: Big-O, amortised analysis, recurrences, space/time trade-offs LEARN AI — MACHINE LEARNING, DEEP LEARNING, NLP AND RL • 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 • Reinforcement learning: bandits, Q-learning, policy gradients, DQN, PPO EVERY TOPIC, THE SAME SHAPE Plain-language intro, a step-by-step walkthrough, the maths written out, complete code, an interactive lab, real-world uses and key takeaways. PREPARE FOR INTERVIEWS • 54 timed quizzes with 453 questions, under a real countdown clock • Beginner rounds: arrays, hash maps, Big-O, stacks and queues, recursion, search, plus coding rounds on arrays, linked lists and trees • Advanced rounds: graphs, dynamic programming, advanced data structures, and hard classics such as trapping rain water • Scenario, picture and story rounds: real product problems, diagrams and narrated cases (a startup lunch rush, a 3 a.m. outage), solved step by step • AI interview rounds: NLP, LLM and GenAI engineering, computer vision, recommender systems, and AI in healthcare, finance and retail • Every answer explains the solution, its complexity, and why the tempting wrong answer fails • 57 coding pattern guides (sliding window, two pointers, merge intervals, monotonic stack, backtracking, union-find and more), each with its own lab • 102 coding problems grouped by pattern, with progressive hints, a walk-through and a full Kotlin solution • System design and ML system design primers, and 20 behavioural questions with STAR guidance For students, self-learners, campus placements, new-grad roles and experienced software engineer, data scientist or ML engineer interviews. LEARN, THEN REMEMBER Learn mode checks each quiz answer as you go. A weak-spot drill targets the patterns you miss most, and every miss comes back as a flashcard. 2,414 flashcards on an SM-2 schedule, a completion ring per track, a week strip of what you finished, and your best score on every quiz. WORKS ANYWHERE Everything is bundled in the app. No account, no sign-in, no server: study on a commute or with data switched off. Progress stays on your device. Light and dark themes, bookmarks, and optional study reminders you can switch off in Settings. PREMIUM AlgorAI is free to start: a dozen intro lessons are always open, and a rewarded ad opens a further selection of lessons for 6 hours. Premium unlocks every lesson, lab, quiz and interview round and removes ads. Choose a monthly subscription, charged to your Google Play account and renewing monthly until cancelled (manage or cancel any time in Play Store subscriptions), or pay once for lifetime access.