System Design Refresher vs Al

System Design Refresher is a free study companion for software engineers preparing for system design interviews. WHAT'S INSIDE • 30+ system design articles covering distributed systems, databases, caching, and more • Engineering blogs from top tech companies (Google, Meta, Stripe, Airbnb, and more) aggregated in one place • AI-powered flashcards with spaced repetition • Ask AI to summarize or explain any article in plain language • Favorites, reading progress tracking, and custom RSS feeds FEATURES • Works offline — articles download for reading without internet • Dark mode, font customization, and text size controls • Face ID / Touch ID lock for privacy • Sign in with Google or Apple, or use as a guest with no account required

AI-Jabr is a modern training platform for students who want to master competition mathematics and advanced problem solving. Designed for ambitious high school students worldwide, AI-Jabr combines theory, structured practice, and olympiad-level challenges in a single learning system. PROBLEM BANK Practice with a growing collection of competition-style problems from 2000–2025, organized by topic and difficulty. STRUCTURED LEARNING Study the core theorems and formulas used in competition mathematics before solving problems. MULTIPLE LEVELS • Foundations – build strong algebra and precalculus skills • Competition Math – advanced high school problem solving • Olympiad Training – national and international olympiad level KEY TOPICS Algebra Geometry Number Theory Combinatorics Probability Trigonometry Complex Numbers FEATURES • Structured study and practice modes • Organized theorem and formula reference • Topic-based problem exploration • Exam-style training sessions • Designed for serious competition preparation AI-Jabr helps students develop deep mathematical thinking, logical reasoning, and problem-solving skills needed for high-level mathematics competitions worldwide.