Algorena vs Beatcode

Don't just watch algorithms. Call their next move. Algorena teaches algorithms the way they actually make sense: by running them. Every lesson is the same four steps. Watch the algorithm run, step by step, with every decision narrated. Then the machine stops mid-execution and asks you to call the next move — which cell does binary search look at now? Which neighbor does the queue serve? You answer, you find out immediately, and a wrong answer tells you exactly which idea slipped. Then three questions prove you understood the concept, not just the animation. Nothing here is a video. Every animation is the real algorithm executing on real data, generated fresh each time you practice — so you can never memorize a run. WHAT YOU LEARN • 58 skills across 18 tracks, from linear search to A* pathfinding • Free forever: arrays and search, two pointers and sliding window, prefix sums, the first sorts, stacks, queues and linked lists — 15 complete lessons, full quality, no teasers • Pro adds the advanced 43: merge and quick sort, heaps, radix, Timsort, hash tables, Bloom filters, LRU caches, BSTs, BFS and DFS, Dijkstra, topological sort, union-find, Kruskal, Prim, Bellman-Ford, Floyd-Warshall, recursion and backtracking, dynamic programming, flood fill, A*, KMP, Rabin-Karp, Boyer-Moore, tries, Huffman coding, minimax, alpha-beta pruning, quadtrees, convex hulls and Monte Carlo HOW IT WORKS • See — the algorithm runs on a live stage, with pseudocode highlighting the exact line executing • Predict — the run pauses at every real decision point and hands you the wheel • Understand — miss one and you get the specific misconception, not a red X • Prove it — three concept questions close every lesson A COACH THAT ACTUALLY WATCHES Algorena remembers which mistakes you repeat — not how many, but which kind. "You've been eliminating the half the target is actually in." Then it offers a three-round drill on exactly that. The Daily 5 mixes five skills a day, weakest first. BUILT FOR THE INTERVIEW, AND FOR AFTER IT Mastery per skill, a rank that climbs with the whole curriculum, and a streak that only asks for five minutes. ALGORENA PRO • All 43 advanced lessons • The Coach's drills and the Daily 5 across all 58 skills • No ads, ever • Every future lesson — included as the curriculum grows • One payment, shared with your family — no subscription PRIVACY, FOR REAL No account. No sign-in. No analytics of our own. No servers. Your progress never leaves your device — we couldn't see it if we wanted to. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Many coding interview problems are a handful of patterns in disguise. Beatcode teaches those patterns the way they actually click: by letting you be the algorithm. LEARN BY DOING Every lesson puts a real algorithm in your hands. Slide the window, move the pointers, push onto the stack, fill the BFS queue. A real implementation checks every move, and when you make a wrong one, Beatcode plays it out so you can see exactly why it fails. FEEL WHY IT’S FAST Try the obvious way first and watch the work pile up. Then do it with the pattern and see the gap at real interview scale: 10,000 steps instead of 50 million. PROVE IT, THEN CODE IT Short “why is this safe?” questions lock in the invariant behind each pattern. Then tap through the Python line by line as the board follows along, and fill in the template yourself. SPOT THE PATTERN Interviews test recognition. Every lesson ends by spotting the pattern in a fresh problem, and Pattern Radar is a fast-paced round that trains you to name the right tool. Misses come back until they stick. SEVEN PATTERNS, FREE • Two Pointers • Hash Map • Sliding Window • Binary Search • Stack (including the monotonic stack) • Intervals • Breadth-First Search FOURTEEN TRICKS (BEATCODE PRO) Short lessons on the clever one-off ideas interviewers love, open after your first two patterns: • XOR Cancellation • Fast and Slow Pointers • Boyer–Moore Majority Vote • Prefix Sums with a Hash Map • Index Marking • Kadane’s Algorithm • Dutch National Flag • Rotate by Reversing • Union-Find • Trie (Prefix Tree) • Dijkstra’s Algorithm • Greedy (Farthest Reach) • Bit Masks (Sets as Numbers) • Two Heaps (Running Median) KEEP IT GOING • Collectible pattern cards with cues, invariants and templates • Daily streak, trophies and Game Center leaderboards • Endless practice boards with fresh inputs and a three-star score • Solve the real one: after each lesson, try a real interview problem with a Lock Screen timer and hints you unlock one at a time EVERYWHERE YOU ARE • Home Screen widgets: answer a Spot It card right from the widget, keep an eye on your streak, or jump into your next lesson • Lock Screen and StandBy widgets, plus a Control Center button for a quick Radar round • Answer the daily reminder’s card straight from the notification • Apple Watch: your pattern cards, complications for your streak and a Spot It card, and quick Radar rounds with haptics • Siri: “Quiz me in Beatcode” BEATCODE PRO The seven core lessons and their practice boards, challenges, Radar questions and real interview problems are free. Beatcode Pro unlocks the remaining lessons and their content on iPhone, Apple Watch and widgets. Pattern cards, trophies, your streak, reminders and Game Center are also free. • Beatcode Pro Monthly: $7.99 a month • Beatcode Pro Yearly: $39.99 a year, with a 7-day free trial for new subscribers Prices are in US dollars and may vary by country. Payment is charged to your Apple Account when you confirm the purchase, or when the free trial ends. Subscriptions renew automatically at the same price unless auto-renew is turned off at least 24 hours before the end of the current period; your account is charged for renewal within 24 hours before the period ends. Manage or cancel anytime in your Apple Account’s subscription settings. Any unused part of a free trial ends when you subscribe. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://beatcode.app/privacy/ PRIVATE BY DESIGN You can learn without signing in. Optional Game Center features use your Apple Account. Your learning progress stays on your devices, and purchases go through Apple. Beatcode has no ads and does not track you across apps or websites.