# Algorena - Learn Algorithms — Watch algorithms think

> Watch algorithms think (iPhone/iPad app by Vinh Nguyen.)

- Source: https://appshunter.io/ios/app/algorena-learn-algorithms/id6794787482 (this page in markdown: same URL + `.md`)
- Developer: [Vinh Nguyen](https://appshunter.io/developer/1802304933)
- Category: Education, Developer Tools
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 26.0 · 9 MB
- Languages: American English
- Released: 2026-08-06
- Data updated: 2026-08-15
- User reviews in markdown: https://appshunter.io/ios/app/algorena-learn-algorithms/id6794787482/reviews.md

## What is Algorena?

Algorena teaches algorithms the way they actually make sense: by moving.

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 — $0.99, ONCE
• All 43 advanced lessons
• The Coach's drills across all 58 skills
• Every future lesson — the curriculum grows, Pro owns all of it
• No ads
• One payment, yours forever, shareable with your family. No subscription. Ever.

PRIVACY, FOR REAL
No account. No sign-in. No analytics of our own. No servers. Your progress never leaves your phone — we couldn't see it if we wanted to. The free version is supported by ads, which appear only between sessions, never inside a lesson, and which Pro removes.

Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Algorena Pro | $0.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-08-06

No release notes.

## More apps by Vinh Nguyen

- [Just'a Tabata: A Workout Timer](https://appshunter.io/ios/app/justa-tabata-a-workout-timer/id6789550194)
- [Tilely: Photo Tile Puzzle](https://appshunter.io/ios/app/tilely-photo-tile-puzzle/id6790064872)
- [Habit Switch: Swap Bad Habits](https://appshunter.io/ios/app/habit-switch-swap-bad-habits/id6791391862)
- [OneQ - One Question a Day](https://appshunter.io/ios/app/oneq-one-question-a-day/id6792615124)
- [Focus Proof](https://appshunter.io/ios/app/focus-proof/id6794625162)

All apps by Vinh Nguyen: https://appshunter.io/developer/1802304933

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-15.*