MentalMather vs Numgrid

MentalMather measures your daily cognitive performance through mental math — not to teach you math, but to measure how sharp your brain is right now. HOW IT WORKS Take a quick Sharpness Test each day. The app compares your speed across addition, subtraction, multiplication, and division against your own historical baseline. The result is your Sharpness Score — a personalized metric that tells you whether you're performing above or below your norm. This isn't about getting better at math. It's about measuring your cognitive throughput. When your working memory is firing on all cylinders, you solve problems faster. When it's not — due to poor sleep, stress, or fatigue — your score reflects that. FEATURES - Sharpness Score — your daily cognitive performance metric, personalized to your baseline - Guided Assessment — finds your ideal difficulty level automatically - Quick Play — practice at your own pace with customizable difficulty, timing, and operations - Challenge Mode — create challenges and share them with friends via code or QR, then compare results - Detailed History — every session tracked with per-problem breakdowns and solve times - Stats & Analytics — sloppiness tracking, personal bests, per-operation performance - Light & Dark themes — premium dark mode with metallic design, clean light mode - Haptic feedback — feel your correct and incorrect answers - Works offline — all your data stays on your device WHY MENTALMATHER Most brain training apps are games disguised as science. MentalMather is a measurement tool. Your Sharpness Score compares you against yourself — not against strangers on a leaderboard. The question isn't "are you good at math?" It's "how sharp are you today compared to your own baseline?" Built for people who care about their cognitive performance and want a quick, honest daily check-in.

A fresh math crossword every day — the same puzzle for everyone on Earth. Place the digits 1 to 9 in a 3x3 grid so every row and every column equals its target. One clean solution, reached by pure logic, plus hints that actually teach you the arithmetic behind each move. Numgrid is a daily cross-sums number puzzle — think of it as a crossword built from arithmetic instead of words. The operators between the cells are given; your job is to work out which digit belongs where. Guessing is never required: every daily puzzle has exactly one solution you can reach by reasoning alone. It is the calm morning ritual for anyone who loves sudoku, KenKen, kakuro and a genuinely good brain teaser. HOW TO PLAY - Fill the 3x3 grid with the digits 1 to 9, each used exactly once. - Read every row left to right: it forms an equation that must equal the target on the right. - Read every column top to bottom: it must equal the target at the bottom. - The operators (+, -, x) are fixed and shown between the cells. Multiplication is worked out before addition and subtraction, exactly like at school. Every value stays a whole number — no division, no fractions. ONE PUZZLE A DAY - The very same challenge for the whole world, generated from today's date. - A gentle weekly curve: Easy from Monday to Thursday, Medium on Friday and Saturday, and a proper Hard every Sunday. - A discreet timer, your personal average and how today compares the moment you finish. BUILD YOUR STREAK - Solve the puzzle every single day to keep your streak alive. - A monthly calendar shows every day you have cracked, with today clearly marked. - Missed a day? Unlock it from the archive and catch up whenever you like — it never breaks your streak. HINTS THAT TEACH YOU This is what makes Numgrid different. A hint does not just hand you a number — it fills a cell that logic already forces and explains the arithmetic in one short line, such as "Row 2: 4 x 3 - 5 = 7, so this cell is 7." You learn the technique, not just the answer. A built-in digit tracker dims the numbers you have already placed, so you always see what is left. ENDLESS PRACTICE Want more than one a day? Practice mode serves unlimited puzzles by difficulty — Easy, Medium or Hard — with no daily limit and the same guaranteed single solution. TRACK YOUR PROGRESS - Puzzles solved, current streak and best streak, all in one place. - Average solving time for each difficulty so you can chase your own records. - A simple 14-day chart to watch yourself get faster and sharper. PERFECT FOR - Fans of sudoku, KenKen, kakuro, cross sums and daily newspaper number games. - Anyone who wants a quick, screen-calm mental workout with morning coffee or before bed. - Players who love a daily ritual and a growing streak to protect. - Complete beginners: the teaching hints turn cross-sums from puzzling to obvious. SOLVING TIPS - Start where a row or column has a small target with a subtraction — the options are few. - Remember the order: work out the x part first, then add or subtract. - Use the digit tracker: with 1 to 9 each used once, ruling numbers out is half the battle. - When a row is nearly full, its target usually pins the last digit exactly. Every one of these is something a hint will demonstrate for you, right when you need it. PRIVACY FIRST - Works completely offline, apart from ads. - No account, no sign-up and no personal data collected by us. - Your puzzles, streak and stats are stored only on your own device. - An optional daily reminder can nudge you at 9:00 if you want it. The daily puzzle screen stays clean — no banners, no interstitials. Rewarded ads are opt-in only, for when you want an extra hint or check, or to unlock an archived day. Download Numgrid and start your streak today. One puzzle, every day — sharpen your mental math, one digit at a time.