Store live
Chrome Web Store
Install CalcSprint for fast popup math practice inside Chrome.
Browser Extension
CalcSprint Browser Extension
Train your brain right in your browser
CalcSprint is a lightweight browser extension for quick mental math practice. Open the popup, choose a difficulty level, and start solving fast arithmetic challenges in seconds.
It is built for short, repeatable training sessions that fit naturally into your day. When you want more room, more depth, and a fuller challenge loop, the main CalcSprint website is ready too.
Chrome, Firefox, Opera, and the iPhone app are live now. Edge will follow as soon as its store page is published.
Install CalcSprint in your browser
Install from your browser's official store. More browsers coming soon.
Coming soon
Microsoft Edge Add-ons
Quick mental math training for Edge users who want instant popup access.
Store live
Firefox Add-ons
Use CalcSprint as a compact browser math trainer with focused daily sessions.
Store live
Opera Add-ons
Keep a lightweight quick math trainer one click away inside Opera.
Also available on iPhone and iPad
Use the same quick-training idea on mobile when you want to practice away from the browser.
CalcSprint: Just Play on mobile
If you want the same short, repeatable training loop on mobile, CalcSprint is also live on the App Store and Google Play. The app keeps the same fast-start, no-sign-up approach and works well for quick daily brain-training sessions on the go.
Use the browser extension when you want one-click practice during browser work. Use the mobile app when you want to train in short breaks, on the move, or away from your desk.
Get CalcSprint on mobile
Live now as version 1.0 for iPhone and iPad.
What is CalcSprint Extension?
A small product with a clear purpose: short, useful, repeatable math practice right inside the browser.
CalcSprint Browser Extension lets you solve quick math challenges in a compact popup window without opening a separate tab. It is designed for short, distraction-free sessions and instant access whenever you want a fast mental reset.
The extension focuses on a tight daily-use loop: open the popup, pick a difficulty, start a sprint, and close it when you are done. No login, no setup friction, no complicated navigation.
That makes it useful as a standalone browser math extension. At the same time, it fits naturally into the wider CalcSprint product ecosystem, where the full website provides longer practice sessions, more depth, and a more spacious training experience.
Key features
Everything here is built to make daily brain training simple enough to keep using.
Fast 60-second math sprints
Start a short practice round in seconds instead of committing to a long session.
Easy, Medium, and Hard difficulty levels
Choose a level that matches your current focus, confidence, or daily energy.
Instant popup access
Open the extension directly from the browser toolbar and begin practicing right away.
Local high scores
Track your own best runs without accounts, cloud profiles, or extra setup.
Clean distraction-free interface
The popup stays compact, readable, and useful even when you only have a minute.
Great for brain training
Use it for warm-ups, focus breaks, or quick mental math practice throughout the day.
Visual preview
A store-ready layout with room for screenshots now and easy asset swaps later.
Open and start fast
Launch CalcSprint from the browser toolbar and jump into a sprint with almost no friction.
Pick your pace
Switch between Easy, Medium, and Hard depending on whether you want rhythm, challenge, or speed.
Keep local bests
Use the extension as a quick math trainer you can revisit every day and measure against yourself.
Browser extension vs full website
One product, two modes: quick access in the popup and a fuller training flow on the main site.
Browser Extension
Best for fast access and short daily math practice directly inside your browser.
- Quick popup training
- Short daily sessions
- Local best score tracking
- Focused, lightweight interface
- Built for instant use
Full Website
Best when you want a bigger practice area, more levels, and the fuller CalcSprint experience.
- More levels and richer progression
- Longer sessions and more room to focus
- Website content, blog, and support pages
- Accessibility controls and full-screen layout
- Deeper overall product experience
Why train mental math in your browser
A browser math extension works best when it becomes a habit, not a project.
A browser math extension lowers friction. You do not need to open a separate app, switch devices, or remember another routine. That makes it easier to fit quick brain training into real life.
For many people, mental math in the browser feels more natural than committing to a long study session. A compact popup creates a focused environment for short arithmetic bursts that still add up over time.
A quick math trainer also works well for daily consistency. Instead of waiting for the perfect time to practice, you can do one short sprint between tasks, after email, or before a meeting.
That is why a math practice extension can be genuinely useful: it turns browser time into a small, repeatable moment of skill-building without trying to become a full productivity system.
FAQ
Short answers for users and store reviewers alike.
What is CalcSprint Browser Extension?
It is a lightweight popup math trainer for quick mental arithmetic practice directly inside the browser.
Is CalcSprint free to use?
Yes. CalcSprint is designed to be easy to start and useful without requiring a paid account.
Which browsers support CalcSprint?
CalcSprint is available for Chrome, Firefox, and Opera. Edge availability is planned for a future store rollout.
Is CalcSprint available on mobile?
Yes. CalcSprint: Just Play is available on the App Store and Google Play if you want the same quick-training loop away from the browser.
Does the extension require an account?
No. You can use CalcSprint without creating an account or logging in.
Can I use CalcSprint without opening the website?
Yes. The extension is useful on its own for short popup sessions. The website is there when you want the full CalcSprint experience.
What is the difference between the extension and the full website?
The extension is designed for instant access and shorter sprints, while the website provides a richer, more spacious training flow.
Does CalcSprint store my personal data?
CalcSprint is built to work without accounts or server-side user profiles. The extension uses local storage for preferences and local best scores.
How do I install CalcSprint?
Use the official browser store links on this page. If a browser listing is not live yet, the button will be marked as coming soon.
Start today
Start training your brain with CalcSprint
Install the browser extension for quick daily math sprints, or move to the main website when you want the full CalcSprint experience.