CalcSprint

CalcSprint is a lightweight browser extension for quick mental math practice right inside your browser. Open the popup, choose a difficulty level, and start solving fast arithmetic challenges in a 60-second sprint. It is designed for people who want a short brain workout without opening a full website, creating an account, or dealing with distractions. Everything starts instantly and works in a compact popup window. What you can do with CalcSprint Practice mental math in short 60-second rounds Choose from Easy, Medium, and Hard difficulty levels Solve fast arithmetic tasks directly in the extension popup Track correct answers, wrong answers, and streaks Save your best score locally in the browser Train in a simple, distraction-free interface Difficulty levels Easy — addition and subtraction Medium — mixed arithmetic with faster flow Hard — more demanding quick math challenges Why people may like it Fast to launch No sign-up required Clean interface Great for quick daily brain training Useful for students, adults, and anyone who enjoys mental math How it works Open the CalcSprint extension Choose your difficulty Start a 60-second sprint Type your answers and press Enter Try to beat your best local score CalcSprint is built as a simple and focused mini trainer. If you want more levels, more challenge types, and a fuller experience, you can continue on the website version.