Algorena vs Vietling

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/

Vietling teaches you Vietnamese vocabulary and then makes sure you keep it. Every word is chosen by how often it actually turns up in speech, so the first hundred you learn do far more work than the next thousand. There are 1,220 of them, each with an example sentence, and they are spoken aloud by a studio voice model rather than read out by your phone's built-in text-to-speech. Hear it before you learn it Vietnamese has six tones, and a word said in the wrong one is a different word. Short video lessons cover the alphabet, the six tones, consonant clusters and vowels, each followed by a quiz, so you know what you are listening for before the words start arriving. Two ways to study Learn introduces new words. You meet the word, pick it out of four, then place it into a real sentence with a gap in it. Nothing is marked correct until you have actually produced it. Review is the quiet one. Spaced repetition brings back exactly the words that are about to slip, on the day they are about to slip, and nothing else. Short sessions, no games, no noise. Come back after a few days away and a few easier cards come first, rather than a wall of everything you have forgotten. Built for Southern Vietnamese The vocabulary is the Southern one — dạ, hẻm, nha, heo — the words you will hear in Saigon and the Mekong Delta rather than the textbook Northern forms. Vietnamese has no age-neutral word for "you", so Vietling asks your age once and teaches you the kinship terms that actually apply to you: what you call a waiter, what a waiter calls you, and what changes when the person is older. A pet, a league, and people to race Every review feeds a pet that grows as you do — pick from eight, from a chick to a dragon. Each week you are placed in a league with other learners at your level; reach the week's target and you climb a tier. Add friends with a code, or send a request to learners the app suggests. The streak is honest about being broken. Reminders that learn your routine Pick a time during setup. Once Vietling has seen when you actually study, it moves the nudge to just before then — and never sends one on a day you have already studied. Light or dark There is a proper dark theme in Settings. Nothing switches on its own and nothing nags you about it; it is a switch, and the app remembers which way you left it. Your data Your progress is backed up to an account the app makes for you, with no email or password needed. Other learners see your display name, profile picture, pet and weekly XP — nothing else. There are no adverts and no analytics. Delete the account from inside the app at any time, and it stays deleted. Studying works offline The deck, the sentences and all of your progress live on the phone, so a session with no signal works exactly as it does at home. Audio is fetched the first time you hear a word and then kept, so words you have already met stay audible offline too, and anything you study away from a connection catches up when you are back online.