Focus
Two uninterrupted minutes with numbers and nothing else.
Daily mental arithmetic
Make your mind sprint. Once a day.
nocalcu turns mental arithmetic into two minutes of playful friction. One fixed race. One score to beat tomorrow.
- 120 seconds
- 1 benchmark
- Free
- Works offline
Why this exists
Most days, your mind never has to race.
Search remembers. Maps route. Calculators answer. nocalcu keeps one small piece of friction alive.
Progress
Yesterday’s score becomes today’s finish line.
Technique
Every skipped lap turns into a worked method.
Stuck is part of the race.
Skip it. See the move. Keep running.
One tap reveals the arithmetic behind the answer. The clock keeps the lesson concrete.
Install the daily sprint
Try the friction
Five questions.
Start the clock.
Answers submit themselves the instant they’re right. The pause before each answer is the part that moves.
↳ No sign-up. No setup. Just numbers.
1 of 5
0.0s
MENTAL MATH
18 + 46
?
Built for repetition
One score stays honest.
Seventy-five races keep it fun.
The benchmark
One race keeps the score honest.
The benchmark never changes: 120 seconds, fixed mix, one total. Yesterday becomes a finish line instead of a memory.
- Same time
- Same mix
- Clear personal best
Custom races
The track gets wider.
Five levels. Fifteen operation mixes. Seventy-five custom races. Each keeps its own best while the benchmark holds its ground.
Ready when you are
One sprint from now, there is a number to beat.
The benchmark takes 120 seconds. The next one starts whenever the last one ends.
nocalcu.apk · 172 KB · Android 8+
- 1Download
Tap the install button.
- 2Open nocalcu.apk
Use the download notification.
- 3Tap Install
Your first sprint is ready.