Cognitive Calculations

Exercise your brain with quick math challenges

Cognitive Calculations turns spare moments into a quick mental math workout, right from your browser toolbar. Solve fast, timed problems across addition, subtraction, multiplication, division, and percentages. PRACTICE YOUR WAY - Adjustable difficulty (2-4 digits), or adaptive mode that adjusts to your recent performance - Weight each operation so the ones you want to master show up more often - Occasional decimal-answer division for extra challenge - Practice mode (no timer) or Sprint mode (fixed-length round with a score screen) TRACK YOUR PROGRESS - Live streak, best streak, and accuracy badges - 7-day history plus all-time totals - XP and levels, with confetti at streak milestones and optional sound effects STAY CONSISTENT - Two independent daily reminders, each with a 5-minute snooze - A keyboard shortcut to jump straight into a problem - Clicking a reminder opens the app immediately BUILT TO FEEL AT HOME IN YOUR BROWSER - Clean, card-based settings page that auto-saves as you go - Light and dark theme toggle, independent of your OS setting Whether you have 30 seconds or a few minutes to spare, Cognitive Calculations helps keep your mental math sharp, one problem at a time.