Best Apps to Learn Data Structures & Algorithms on Your Phone (2026)

Learning data structures and algorithms (DSA) on a phone used to mean reading articles on a small screen. In 2026 there are real options: LeetCode has official apps, several apps animate algorithms step by step, and a few cheap tools let you build and play with trees and graphs.

Below is what each one is good for, what it is not good for, and what it costs. We checked every listing, release note and price on 20 October 2026.

Our quick picks

• Best for learning data structures and algorithms on your phone: Algo Mind. Step-by-step animations synced to the code in Python, Java, Kotlin and C++, built around coding-interview patterns, and free to start. (It is our app; see the disclosure above.)
• Best for practising real problems: LeetCode. Official iOS and Android apps with a code editor and the real judge.
• Best newer all-in-one: AlgoMaster. Visual lessons plus system design, but very new and the most expensive here.
• Best one-off visualizer: VisiGrab. Hands-on trees and graphs for $6.99 on iOS.
• Best for intuition from zero: Brilliant. The most polished interactive lessons.
• Best free reference: GeeksforGeeks (app) and VisuAlgo (website).
• Best if you cannot code yet: Mimo or Sololearn.

The apps at a glance

How we compared them

We looked at each app’s own store listing, release notes and pricing page on 20 October 2026, and its ratings on the US App Store and Google Play. For every app we asked four questions:

1. Can you see an algorithm run, one step at a time?
2. Does the practice suit a phone, where typing long code is slow?
3. Is it deep enough for coding interviews, not just the basics?
4. What does it cost, and what is free?

We did not run month-long trials of every app, so this guide does not claim we tested them all in depth. Where we quote a rating or a price, it is the figure the store or the company showed on that date.

LeetCode: best for solving real problems on the go

Best for: people who already know the main patterns and want to keep practising away from a laptop.

LeetCode launched official apps for iPhone and Android in April 2026. Since then it has added a code editor, submissions with runtime and memory charts, step-by-step hints and discussion threads. It is rated 4.75 from 644 ratings on the US App Store and 4.6 on Google Play.

• What works: you write real code and submit it to the real judge. The daily problem and contest calendar make it easy to keep a streak.
• What doesn’t: there are no animations of how an algorithm works, only charts of your runtime. Typing a 40-line solution on a phone keyboard is slow, which is the most common complaint in reviews.
• Price: free app; LeetCode Premium is $35 a month or $159 a year.

Algo Mind: best for learning DSA on your phone, step by step

Best for: learning data structures and algorithms on a phone, especially if you are preparing for coding interviews and understand an idea best by watching it run.

Algo Mind is our app. More than 160 of its problems have animated walkthroughs: you play, pause and step through the algorithm while the matching line of code highlights, in Python, Java, Kotlin or C++. Around them sit 1,577 practice problems across 17 topics, 196 fill-in-the-blank code puzzles, 21 cheatsheets and an 8-chapter curriculum from Big O to dynamic programming.

• What works: you see why a pattern works before you practise it, and the practice is built for a phone: order the steps, answer true/false checks, fill in the missing code. Core lessons work offline and there are no ads.
• What doesn’t: there is no full code editor or online judge, so you rebuild solutions as puzzles rather than from a blank page. Most of the 1,577 problems are explained in text and code; the animated walkthroughs cover the core patterns. It is new, with no store ratings yet.
• Free tier: as of version 1.1.3, the first curriculum chapter, one Practice Path level and two animated problems a day.
• Price: Algo Mind Pro is $22 a month or $69 a year in the US; prices are lower in many regions.

AlgoMaster: a newer visual option with system design

Best for: learners who want visual DSA lessons and system design in one app, and do not mind a very new product.

AlgoMaster launched in July 2026. Its makers say it has more than 1,000 animations, plus a mode for listening to lessons. It is the closest app to Algo Mind in approach.

• What works: visual lessons, quizzes and system design under one subscription.
• What doesn’t: it is very new, with 11 ratings on the US App Store, so there is little independent feedback yet. It is also the most expensive app here.
• Price: $34.99 a month, $89.99 a year or $179.99 lifetime.

VisiGrab: best cheap visualizer of classic data structures

Best for: students who want to play with textbook data structures, such as AVL trees, red-black trees and graphs, for a one-time price.

VisiGrab lets you step forwards and backwards through operations, and build your own trees and graphs to see what happens. It shows code in Java, Python and C++. It is rated 4.8 from 75 ratings on the US App Store and 4.4 from about 1,400 ratings on Google Play.

• What works: hands-on, cheap and still updated in September 2026.
• What doesn’t: it covers classic data structures and graph algorithms, not interview problems such as sliding window or dynamic programming patterns.
• Price: $6.99 for lifetime access on iOS; Android sells items from $0.99.

Brilliant: best for building intuition from zero

Best for: beginners who want to understand how algorithms think before they worry about interviews.

Brilliant teaches through interactive puzzles. Its Computer Science Fundamentals and Data Structures in Python courses cover searching, sorting, complexity, linked lists and trees. It is rated 4.73 from more than 33,000 ratings on the US App Store.

• What works: the most polished learning experience on a phone, and the free tier gives you two lessons a day.
• What doesn’t: it does not go to coding interview depth, and Brilliant does not publish its prices; the App Store lists Premium purchases from $24.99 to $149.99 without saying which term is which.
• Price: see above; check the price in the app before you subscribe.

GeeksforGeeks: best free reference

Best for: free reading on any DSA topic, and placement prep in India.

The GeeksforGeeks app puts its huge article library, a problem of the day and quizzes on your phone. It is rated 4.3 on Google Play from about 15,500 ratings.

• What works: it is free, and almost every topic has an article with code in several languages.
• What doesn’t: it is reading, not seeing: there are no animations, and the Android app shows ads.
• Price: free; courses are sold individually.

Educative Go: best for Educative subscribers

Best for: people who already study Educative’s Grokking courses on a laptop and want to review on the move.

Educative Go is a flashcard companion to educative.io. Its own listing points you to desktop for full lessons and runnable code.

• What works: quick review of courses you are already taking.
• What doesn’t: it is not a full course on its own, and it has few ratings so far.
• Price: the App Store lists plans from $199 to $299.99 without labelling the terms.

Mimo and Sololearn: if you cannot code yet

Neither Mimo nor Sololearn has a data structures and algorithms course. Both are excellent, highly rated apps for learning a first language, such as Python, in short daily lessons. If loops and functions are still new to you, start here, then move to one of the apps above.

Websites that work on a phone

• NeetCode is a website, not an app. It is known for the NeetCode 150 roadmap and clear video explanations with animations. NeetCode Pro is $119 a year or $297 lifetime.
• VisuAlgo is a free website from the National University of Singapore with the most detailed animations of any tool here. It recommends a large screen, but offers a lite mode for phones.

Which app should you pick?

• You cannot write a loop yet: Mimo or Sololearn first.
• You want to understand how algorithms work, with no deadline: Brilliant.
• You are preparing for coding interviews and learn by seeing: Algo Mind, or AlgoMaster if you also want system design.
• You know the patterns and need practice volume: the LeetCode app, plus a laptop for long solutions.
• You want free material: GeeksforGeeks for reading, VisuAlgo for animations.
• You want to play with textbook data structures for a few dollars: VisiGrab.

Many people combine two: a visual app to understand a pattern, then LeetCode to drill it.

Can you really learn DSA on a phone?

Yes, if you use the phone for what it is good at. Short sessions suit understanding and recall: watching an algorithm run, predicting its next step, explaining why it works. They suit typing a long solution much less.

Here is what “watching an algorithm run” looks like as text. Binary search looks for 9 in a sorted list by halving the range each step:

Binary search for 9 in [1, 3, 5, 7, 9, 11, 13]

Step	low	high	mid	nums[mid]	What happens
1	0	6	3	7	7 is smaller than 9, so search the right half: low = 4
2	4	6	5	11	11 is bigger than 9, so search the left half: high = 4
3	4	4	4	9	Found 9 at index 4, after 3 checks instead of 5

Each row is one decision. An app that animates this, with the code highlighted alongside, makes the pattern stick faster than reading the finished code. Then rewrite it from a blank page on a laptop to prove you can.

The limits: prices and ratings change, and several apps are new. We will review this guide at least every three months and update the date at the top when we do.