Perform calculations within Messages with CalcKey,
the iMessage app for iPhone and iPad.

Calculator in iMessage

Full Screen Mode

Customise with Themes

Dark Mode

Perform your calculation as you would in any other calculator. When you press the equals button, the answer to your calculation is automatically added to the message field.


CalcKey is an iMessage only app which means that is does not appear on the home screen of your device.

Available on iPhone and iPad

Requires iOS 10.0 or higher

Download now

from the App Store


All information typed in to CalcKey is calculated on the device and is not stored. If you choose to change the CalcKey Theme, CalcKey stores your chosen theme preference on your device which can be removed at any time by pressing the "Reset CalcKey", then "Confirm" button at the bottom of the Theme Chooser View.
Please check these terms after any updates.