K-TRICK APP
iPhone APP
An everyday calculator. A magic tool when the moment calls for it.
Force Calculator is an iPhone calculator app shaped by professional magician KOBA’s live performance experience. Use it as a familiar calculator every day, then access the Pro magic features during a routine. The standard calculator features are free to use.
POSSIBLE WITH FORCE CALCULATOR
A prediction, a moment in time, a surprise shared by everyone. Three magic modes turn everyday numbers into a memorable reveal.
A number prediction
Have spectators enter numbers and calculate. The result matches the number you wrote down in advance. Turn a prediction on a card or in an envelope into the finale.
The prediction and the result match.
A date & time reveal
An ordinary calculation reveals today’s date and the time at the moment of calculation. Invite everyone to check their clocks for a surprising finish.
The result reveals the current date and time.
A group routine
Let several spectators contribute numbers, then finish with a final input that brings the result to your prediction. Set the minimum number of entries to suit your routine.
Everyone’s numbers lead to your prediction.
Automatic Adjustment also supports entering numbers with the screen facing down, adding a moment where you cannot see the display.
These are example routines using the Pro features (paid). Numbers shown are illustrative. Learn the setup and operation in the in-app tutorials.
FEATURES
For first-time users, interactive tutorials demonstrate each magic mode on the actual calculator screen. Follow highlighted keys and automatic input to learn Target, Time, and Automatic Adjustment modes step by step.
Handle standard arithmetic and percentages, then look back at earlier calculations in history. It works naturally for quick calculations outside a performance, too.
When needed, Pro unlocks features created for magic. The interface retains the appearance of a normal calculator so it can fit naturally into a performance.
Choose target results, times, and other details to suit the routine. Several modes are available for different performance situations.
DESIGNED FOR iPHONE
The button layout and number display are carefully designed to feel at home on iPhone. Force Calculator supports interfaces tailored to iOS 18 and iOS 26, along with calculation history and language switching.
FORCE CALCULATOR
Use a familiar calculator every day, then bring its magic features into your next performance. If you currently use the web version, please also review the migration information.