Mental math is a skill.
So we made it trainable.
Calculation isn't a talent you either have or you don't. It's a muscle. TauState turns thinking in numbers into something deliberate — a quiet daily ritual that compounds.
Numbers as training
Every session is shaped around what you're actually working on — from the basics to number systems and number theory.
Progress over perfection
You don't need a perfect run. You need the next one. Difficulty adapts so you stay in the zone where growth happens.
A space to focus
No noise, no accounts, no distractions. Just you, the problem, and the satisfying moment the answer lands.
Built by someone who wanted to calculate.
TauState isn't the product of a big studio. It started as the personal training tool of a single developer in Germany — built to sharpen his own mental math for final exams. The tool became a project, and the project became an app that's as uncompromisingly private and focused as the one he wanted for himself.
Ready to elevate how you calculate?
Free on TestFlight. iPhone and iPad. Private by design.
Join the beta