SD Primer vs Syswise

Think like a staff engineer — five minutes a day. SD Primer turns system design mastery into a daily habit. Answer today's questions, debug a broken architecture with your hands, and build the instincts that tech interviews (and real jobs) demand. YOUR DAILY RITUAL • Daily Quiz — five sharp multiple-choice questions on scalability, databases, caching, queues, and trade-offs, with clear explanations for every answer • Focus Practice — we detect your weakest topics and serve extra reps exactly where you need them • Streaks, XP, and levels that make consistency effortless HANDS-ON ARCHITECTURE LABS Don't just read about system design — fix it. Each lab drops you into a live incident: drag components onto the canvas, wire the fix, defend your reasoning, and get scored with strengths and trade-offs. LEARN AI & ML FROM FIRST PRINCIPLES A structured 64-lesson course, one daily read at a time: from the origins of AI through neural networks, transformers, and how to actually use LLMs well — written for software engineers, no math degree required. AND EVERY DAY • Coding pattern drills — name the algorithm behind the problem • Workplace mastery lessons — the soft skills that get engineers promoted • Curated engineering news and daily tips • Your progress, visualized: topic strength, consistency calendar, achievements SD PRIMER PRO Unlock custom quizzes, labs, and pattern sessions tuned to your goals, plus higher daily limits. Subscriptions auto-renew unless cancelled at least 24 hours before the end of the period; manage anytime in your App Store account settings. Privacy Policy: https://sdprimer.com/privacy Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Start today. Your future self at the whiteboard will thank you.

Get genuinely good at system design, a few minutes a day. The system design round is the part of the loop you can't cram the night before. Syswise turns it into a daily habit: one real design decision at a time, every answer explained, and a readiness score that shows how close you are to interview-ready. Made for software engineers prepping for backend, senior and staff interviews, and for anyone who wants distributed systems to finally click. FREE, NO ACCOUNT NEEDED TO START • A guided path: 9 tracks, 48 topics and 144 skills (concepts, practice, checkpoints, case studies, estimation). Each step unlocks the next, and you earn crowns as you master a skill. • A daily challenge plus 5,000+ questions in 7 formats: multiple choice, ordering, matching, estimation, trade-offs, case studies and lessons. • Every answer explained: why the right option works and why each wrong one misses. • Review that sticks: your mistakes, your weak areas and spaced-repetition cards. • An interview readiness score from 0 to 100, broken down by topic. • Worked case studies: design a URL shortener, a news feed and more. • Weekly leagues from Bronze to Diamond, streaks with streak freezes and repair, and daily and weekly quests that pay out gems. • A streak widget for your Home Screen and Lock Screen (iOS 17+). • Track certificates you can add to LinkedIn (signed-in accounts). • Sign in with Apple, Google or email whenever you're ready to save your progress. • Interface in 30 languages, dark mode, iPhone and iPad. PREMIUM • Unlimited hearts (free accounts get 5, refilling over time). • A 7-day readiness plan that counts down to your interview date. • AI explains why your answer was wrong. • One graded AI mock interview a day, scored on requirements, estimation, architecture, scaling and trade-offs, and communication. Mock interviews come with paid plans and are not included during the free trial. • Monthly gems. Plans: weekly ($4.99), monthly ($9.99) or annual ($39.99, starting with a 7-day free trial). Prices can vary by region and are always shown in the app before you buy. Payment is charged to your Apple ID. Subscriptions renew automatically unless turned off at least 24 hours before the current period ends. Manage or cancel anytime in Settings > Apple ID. Questions, explanations and case studies are in English, the language your interview will be in. Terms of Use: https://syswise.app/terms-of-use Privacy Policy: https://syswise.app/privacy-policy