No ads
Go straight to the tool you came to use.
Small, useful apps. Made with care.
Open and get things done. Rafa Studio makes focused tools that reduce everyday friction—without ads or account sign-ups.
No Ads. No Account. Just Works.
QUICK DISCOUNT
Discount
Original price¥12,800
Final price¥10,240You save ¥2,560
No ads · No account · On device
Simple tools, built around trust.
No account
Start immediately, without creating a profile.
Works offline
Core features keep working without a connection.
The right tool for a small everyday task.
In development · iOS / Android
Discount Calculator
Enter a price and discount to see the final price and savings instantly. It also supports stacked discounts and a customer-facing sales display.
Useful should also feel trustworthy.
We avoid unnecessary features and tracking, and build small apps that stay pleasant to use over time.
How we workA clear place to turn when you need help.
App guidance, privacy information, and contact details will always be easy to find.
Visit support