Knowtifs vs Learn Coding

Knowtifs delivers bite-sized facts on topics that matter to you — history, finance, science, languages, and more. Subscribe to topics, rate content, save facts as flashcards, and study at your own pace. **Knowledge Feed** Subscribe to up to two topics and browse a continuous feed of sourced facts. Sort by community top-rated or by recency. Filter by topic or hashtag. Rate facts with a thumbs up or down to help surface the best content for everyone. Every fact feed is built using a proprietary knowledge graph pipeline that uses multiple large language models. Accuracy may vary depending on the generation pipeline version and models used. Always verify information from primary sources where precision matters. **Flashcard Mode** Every fact you save becomes a flashcard stored locally on your device. Study with Questions First or Answers First — choose which side the card shows, then tap to reveal the other. Auto-Advance plays through cards hands-free at adjustable speeds (×0.5 to ×2). **Topic Subscriptions** Browse and search the full topic library. See the fact count for each topic before subscribing. Tap to subscribe or unsubscribe at any time. **Request a Topic** If a topic is missing, submit a request. Other users vote on community submissions — the most requested topics get added to the platform first. **Import Your Own Cards** Import Anki decks (.apkg) or CSV files and study them alongside your subscribed topics. Plain text and line breaks are preserved; media and HTML formatting are stripped. **Account & Privacy** Sign in with Google or Apple or email. Saved flashcards are stored locally using Apple CoreData and are never uploaded to any server. Cloud data is stored in Google Firebase. Delete your account and all associated data at any time from the Profile screen.

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