Chessbook vs Mathaino

Chessbook is the fastest way to build a bulletproof opening repertoire. Key features: • Create a custom repertoire • Train with spaced repetition • Find gaps automatically • Avoid obscure moves • Handle transpositions • Find mistakes in your online games • Fast & modern interface “A fun and simple way to build an opening repertoire based on probabilities of most likely lines. You will actually learn the moves that will happen on the board!” —Grandmaster Eugene Perelshteyn FIND THE GAPS IN YOUR REPERTOIRE BEFORE YOUR OPPONENTS DO Chessbook calculates your coverage per opening so you always know what to work on. PICK THE BEST MOVES TO MAXIMIZE YOUR WIN-RATE Weigh up your options by looking at stats from master games, engine evaluation and results at your level. ONLY SPEND TIME ON THE MOVES YOU'LL ACTUALLY SEE Most books and courses are written by masters for masters. Chessbook lets you avoid obscure grandmaster lines and focus your effort on the moves that are common at your level. TARGETED PRACTICE MEANS YOU'LL NEVER FORGET A MOVE Chessbook uses spaced repetition, a scientifically proven technique to memorize openings quickly and thoroughly. COLLECT ALL YOUR OPENINGS IN ONE PLACE Nobody gets their whole repertoire from a single course or book. Chessbook lets you combine openings from multiple sources to create a custom repertoire just for you. REVIEW YOUR ONLINE GAMES FOR OPENING MISTAKES Get instant feedback on how well you're sticking to your repertoire. Chessbook supports both Lichess and Chess.com LEARN MIDDLEGAME PLANS FOR ANY OPENING See how top players handle the positions that result from the openings you play. CHESSBOOK PRO Chessbook Pro gives you the ability to add unlimited moves to your repertoire! Free users can add 400 moves. Terms of Use: https://chessbook.com/terms-and-conditions.html Privacy Policy: https://chessbook.com/privacy-policy.html

Mathaino is a daily-problem app for people who graduated a STEM degree and want to stay sharp. HOW IT WORKS Every day at midnight, Mathaino publishes five new problems — one each in math, physics, chemistry, engineering, and biology. The same five problems appear for everyone, like NYT Wordle or Connections. You have all day to attempt them. Each problem is multiple choice with four options. If you're stuck, you can reveal up to five progressive hints. Hint one nudges you toward the right technique; hint five is the full worked solution. Three outcomes are possible: • Solve cold (no hints used) — earn the green square • Solve with hints — earn the yellow square • Reveal the solution — the square stays gray, no shame Either way, playing any subject keeps your daily streak alive. SUBJECTS We pull from the full undergraduate curriculum, from the year-1 fundamentals you remember to the year-3 and year-4 material you might have forgotten: • MATH — calculus 1–3, linear algebra, ODEs, probability, series convergence, real-analysis basics • PHYSICS — classical mechanics, electromagnetism (Coulomb through Maxwell), thermodynamics, intro quantum, special relativity • CHEMISTRY — general chem (stoichiometry, pH, kinetics), organic mechanisms (SN1/SN2/E1/E2), physical and inorganic basics • ENGINEERING — statics, dynamics, circuits (KVL/KCL, RLC, phasors), signals and systems, fluid mechanics, materials • BIOLOGY — molecular bio, genetics (Mendelian, Hardy–Weinberg), biochemistry (Michaelis–Menten, glycolysis, ETC), cell signaling Difficulty rotates through the week: easier on Sunday and Monday, harder on Thursday and Friday — like a crossword. QUALITY Problems are AI-generated then automatically validated and reviewed by a second pass to catch math errors and ambiguity. We keep a hand-authored backup pool so you never see a broken problem, and every problem has a one-tap report button if something still slips through. PRIVACY Mathaino doesn't have accounts. We don't collect your name, email, or location. Your streak and history live only on your iPhone — delete the app and they're gone forever. No ads, no tracking, no third-party analytics. WHY MATHAINO It's a small, kind, low-pressure habit. Five problems is fifteen minutes if you're stretching, three minutes if you're warmed up. Some days you'll nail all five cold; other days you'll reveal a solution and feel humbled. Both are fine. You just keep showing up. — made for people who worked hard through STEM and want to keep it fresh.