# Learn Coding - Off By One — Python, Java, JavaScript Code > Python coding practice app for technical interview preparation and job landing. (iPhone/iPad app by I JUST WANT LLC.) - Source: https://appshunter.io/ios/app/learn-coding-off-by-one/id6748634501 (this page in markdown: same URL + `.md`) - Developer: [I JUST WANT LLC](https://appshunter.io/developer/1807422070) - Category: Education, Productivity - Price: Free with in-app purchases - Rating: 4.30/5 from 4 App Store ratings · 4 written reviews indexed - Age rating: 4+ - Requires: iOS 15.1 · 88 MB - Languages: American English, French (France), German (Germany), Japanese, Korean, European Portuguese, European Spanish - Released: 2025-07-17 - Data updated: 2026-08-25 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/learn-coding-off-by-one/id6748634501/reviews.md ## What is Learn Coding? Land your next tech job. Off By One turns learning to code and coding interview prep into a five-minute daily habit. Real interview problems, taught the way you actually learn: step by step, with animated visualizations, guided code building, and complexity quizzes. You watch the algorithm move, then you build it yourself, then you prove you understand why it works. No copy-pasting into a judge, no walls of text. WHAT'S INSIDE • 64 guided lessons across 14 topics: arrays and hashing, two pointers, sliding window, stacks, binary search, linked lists, trees, tries, heaps, backtracking, graphs, dynamic programming, greedy algorithms, and intervals • Every lesson in Python, Java, and JavaScript, each written for that language by hand, never transliterated: the JavaScript version asks JavaScript questions, the Java version asks Java questions • Animated, step-by-step visualizations that show how each algorithm actually works: pointers travel, windows slide, trees traverse • Big-O time and space quizzes on every problem, so you can explain the "why" in the room, not just recite the code • 20 system design stories covering caching, load balancing, sharding, CDNs, rate limiting, database indexing, message queues, CAP, WebSockets, and more • A beginner intro for every topic, so you can start from zero and still end up interview-ready • Streaks, weekly progress charts, and an activity grid that keep you honest, five minutes at a time HOW A LESSON WORKS 1. Understand the problem and the approach in plain language 2. Watch the algorithm run, one step at a time 3. Build the solution yourself with guided code steps 4. Answer for its time complexity 5. Answer for its space complexity Finish a lesson and the next one is waiting: the curriculum is ordered so every topic builds on the one before it. WHO IT'S FOR • Complete beginners who want to learn to code with a clear goal • CS students preparing for internship and new-grad interviews • Self-taught developers filling the data structures and algorithms gap • Working engineers brushing up before the next interview loop START FREE Every lesson and story opens free: read the problem, watch the first steps, get a feel for it. Premium unlocks full visualizations, code building, complexity training, and system design. Off By One Premium is an auto-renewing subscription. Plans: annual with a 3-day free trial, monthly with a 3-day free trial, or weekly. Prices are shown in the app in your local currency. Payment is charged to your Apple ID account at purchase confirmation, or when the free trial ends. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel in your Apple ID settings. Unused trial time is forfeited on purchase. Privacy Policy: https://www.ijustwantagoodjob.com/off-by-one/privacy-policy Terms of Use: https://www.ijustwantagoodjob.com/off-by-one/terms-of-service ## Key features - Daily coding practice challenges - Detailed lesson explanations - Progress tracking - Focus on interview concepts - Privacy-first design - Learn Python on the go ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Premium Annually | $59.99 | per year | | Premium Weekly | $4.99 | per 7 days | | Premium Monthly Subscription | $9.99 | per month | | Premium Weekly | $1.99 | per 7 days | | Premium Annually (1 Year) | $14.99 | per year | | Premium Monthly (1 Month) | $4.99 | per month | ## Recent user reviews (4 of 4) All indexed reviews: https://appshunter.io/ios/app/learn-coding-off-by-one/id6748634501/reviews.md ### 5/5 — U AND I CAN MAKE DREAMS ACHIEVABLE *2026-02-26* Best of mark ### 4/5 — Pretty good *2025-08-04* Needs to support more languages and more types of challenges **Developer response:** We have listened to your feedback and just had a massive update where we added interactive step-by-step lessons that correspond to each daily puzzle to help users prepare for interviews! I can’t wait for you to try it out! ### 5/5 — How to review problem? *2025-08-02* Is there a way to see the problem afterwards? When I click into it after I have solved it all it shows is stats and an explanation, I would like to be able to view the code again. Update: this app is really the best. There have been fresh problems every single day and I actually look forward to it instead of the dread I feel about leetcode! **Developer response:** We have listened to your feedback, the latest version of the app has a ‘Review Code’ button on the stats page where you can review the puzzle, see the highlighted error line, and view the explanation! Thanks for the review, we take all reviews seriously and make sure to address any improvements. THANK YOU for enjoying the app and helping us build our community!! ### 5/5 — How to review problem? *2025-07-23* Is there a way to see the problem afterwards? When I click into it after I have solved it all it shows is stats and an explanation, I would like to be able to view the code again ## Frequently asked questions about Learn Coding ### What is LeetPal? LeetPal is a Python coding practice app designed to help users ace technical interviews. It focuses on developing debugging instincts and core problem-solving skills through daily challenges and detailed explanations. ### How does LeetPal help with job interviews? LeetPal provides practice based on real interview concepts, common mistakes, and interview patterns. It helps users build intuition for Big O, data structures, and algorithms, strengthening the exact skills recruiters look for. ### What are the premium features in LeetPal? Premium features require purchase and include a Weekly Learning Plan Setting and Python Data Structure and Algorithm Lessons. These are designed to offer a more structured and in-depth learning experience. ### Does LeetPal require personal information? No, LeetPal is privacy-first. It does not require an email, supports anonymous login, and does not sell or share personal data. This ensures a secure and private practice environment. ### What are the subscription options for LeetPal? LeetPal offers several subscription plans, including Premium Weekly and Premium Monthly options, with prices ranging from $1.99 to $9.99. There are also annual plans available for $14.99. Many plans include a 3-day free trial. ### What devices does LeetPal support? LeetPal is available on iPhone and iPod devices. It is designed for mobile learning, allowing users to practice coding on the go. ### How often is LeetPal updated? The latest version of LeetPal is 2.0.5, and it was last updated on January 26, 2026. This indicates a commitment to regular updates and improvements. ### What is the age rating for LeetPal? LeetPal has an age rating of 4+. This suggests it is suitable for a wide range of users, including younger learners interested in programming. ## Version history (last 5 releases) ### 2.1.0 — 2026-08-17 Off By One has a new look and a bigger mission: learn to code, master the interview. • Fresh app icon with full dark mode support • New artwork across the Learn tab • The app now remembers your programming language between lessons • A simpler, cleaner Settings screen • Smaller download, plus polish and fixes throughout Five minutes a day. See you in there. ### 2.0.7 — 2026-03-29 More lessons, more fun, more learning! Coding interview prep on the go to crush your interviews! ### 2.0.6 — 2026-03-28 More lessons, more fun, more learning! Coding interview prep on the go! ### 2.0.5 — 2026-01-26 Improving design even more, adding more questions, and adding fun visualizations! ### 2.0.4 — 2026-01-14 Improved lessons and bug fixes! Have fun preparing for your dream job! ## Apps similar to Learn Coding | App | Rating | Price | Category | | --- | --- | --- | --- | | [LeetO(n)](https://appshunter.io/ios/app/leeton/id6749620204) | 5.0 (5) | Free | Education | | [Leetly - Land a SWE Job](https://appshunter.io/ios/app/leetly-land-a-swe-job/id6752914609) | 4.2 (10) | Free | Education | | [AlgoCode Learn](https://appshunter.io/ios/app/algocode-learn/id6751961718) | 3.4 (7) | Free | Education | | [Learn python Coding](https://appshunter.io/ios/app/learn-python-coding/id6475646500) | 4.5 (16) | Free | Education | | [Yeetcode: DSA & System Design](https://appshunter.io/ios/app/yeetcode-dsa-and-system-design/id6753661560) | — | Free | Education | | [PocketLeet - Prep Anywhere](https://appshunter.io/ios/app/pocketleet-prep-anywhere/id6745113231) | 5.0 (2) | Free | Education | ## More apps by I JUST WANT LLC - [I Just Want a Good Job Tracker](https://appshunter.io/ios/app/i-just-want-a-good-job-tracker/id6744375908) - [Spending Tracker Hue by IJW](https://appshunter.io/ios/app/spending-tracker-hue-by-ijw/id6751465442) All apps by I JUST WANT LLC: https://appshunter.io/developer/1807422070 ## Related topics [leetcode python](https://appshunter.io/ios/topics/leetcode-python) --- *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 2026-08-25.*