Calculi: Scientific Calculator4.4.1 - App Store

Calculators can be hard to use. Calculi plans to change all that.

SIMPLE BUT POWERFUL
Calculi is a smart calculator that is simple and easy to use, but with advanced features for power users. Whether you are trying to balance your checkbook or taking an advanced math class, this app will help you with all of your calculating needs.

CALCULATE ANYTHING
Calculi doesn’t just add two numbers together but can solve complex expressions using the order of operations. The multi-line display allows for small or large expressions. So go ahead and calculate anything and everything! Press the 2nd button to reveal more scientific functions.

UNIT CONVERSION
You can easily convert any of your calculations to a different unit across 17 categories such as length, area, and volume. Unit conversions are saved to your calculation history for easy review. A Calculi Pro subscription is required for this feature.

CURRENCY CONVERSION
Traveling abroad? Not sure how much your lunch costs? Calculi has you covered with support for over 30 different currencies around the globe (data is updated daily from the European Central Bank). A Calculi Pro subscription is required for this feature.

CONSTANTS
Common constants from both mathematical and scientific fields (astronomical, chemical, electromagnetic, etc.) are included for use in calculations.

DESIGNED WITH iOS 18 AND iPadOS 18 IN MIND
Calculi adapts to all the latest iOS and iPadOS devices. Even better, multitasking and multi-window support is available in all orientations on the iPad. Interactive widgets are included for calculations on your home screen, and Control Center widgets provide quick access. You can have Calculi wherever you need it.

GESTURES
Gestures are fun. So why not?
- Long press the delete button to clear the display
- Long press the equals button to use the previous result or expression
- Long press the display to copy, paste, or share
- Long press any calculation item to reuse the expression or result

SUPERCHARGED HISTORY TAPE
Calculations from the history tape can be bookmarked for later and notes can be added for additional context. You can search across notes, expressions, and answers to find the calculation that you are looking for.

GET SHARING
Don’t be selfish. This history tape can be shared either as a single thread or the entire tape using numerous methods such as email, messaging, or print. There is also an iMessage app so you can easily send calculations.

CALCULATE ON YOUR WRIST
Calculi is also available on Apple Watch! Besides a four-function calculator, you will also find a tip calculator and counter.

EXTERNAL KEYBOARD AND TRACKPAD SUPPORT
Pair an external keyboard or trackpad to gain access to powerful shortcuts and full cursor support. You can hold down the command key on your keyboard to view all the available shortcuts.

Finally, if you enjoyed Calculi, please take some time to leave a review. Feedback is always appreciated for future updates.

CALCULI PRO
This yearly subscription grants you access to the following:
- Unit Conversions
- Currency Conversions
- App Themes
- Colorful custom icons

TIP JAR
If you enjoy using the app and want to support an independent app developer, please consider sending a tip.

Subscription Details
- Payment will be charged to iTunes Account at confirmation of purchase
- Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period
- Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal
- Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user’s Account Settings after purchase

Terms of Use: https://www.calculiapp.com/terms.html
Privacy Policy: https://www.calculiapp.com/privacy-policy.html

Version History This app has been updated by Apple to prepare for watchOS 27 compatibility. No new features are included.

This update includes a customer center to manage your Calculi Pro subscription. 4.4.1 03/04/2025 This new release for Calculi contains the following new features and improvements:
- A revamped calculation history that allows you to add notes, bookmarks, and search calculations.
- Updated home screen widgets to support light, dark, and tinted modes.
- New large scientific calculator widget on iPadOS.
- Control Center widget for quick access to Calculi.
- Updated light, dark, and tinted icons support.
- Support for iOS 18, iPadOS 18, and watchOS 11.
- Removed ads.
- Other bug fixes and improvements. 4.4 01/13/2025 In this latest release, Calculi now includes interactive widgets for your home screen! Additionally, you will find the following features and improvements:
- Support for iOS 17, iPadOS 17, and watchOS 10
- All new Apple Watch app
- Option to speak actions and results
- New alternative app icons for Halloween, Thanksgiving, Christmas, Fall, and Winter
- Support for home screen quick actions 4.3 02/26/2024 This update fixes an issue that could cause the app to crash. 4.2.2 08/15/2023 This update brings general performance improvements. 4.2.1 08/15/2023 This update brings the following improvements:
- Improved multi-window support
- New custom alert for expression errors
- New alternative icons (Easter, St. Patrick's Day, and Pride)
- watchOS Complications
- Other various performance improvements 4.2 08/07/2023 This update brings general performance improvements. 4.1.1 03/18/2023 This update introduces the following improvements to Calculi:
- Switch between simple or scientific calculator layouts on iPadOS
- New custom icon added for Valentine's Day
- General performance improvements 4.1 02/16/2023 Calculi v4.0 is here! Rebuilt from the ground up for iOS 16, this new version brings a refreshed design that is packed with new features across all supported devices:
- Redesigned look on iOS, iPadOS, and tvOS
- Currency conversions
- Advanced keyboard layout on iPadOS
- Unified calculating engine across platforms
- Calculation history is now grouped by date
- Updated display with support for number formatting

This major update also concludes the transition to SwiftUI that will provide the groundwork for new features coming in future updates.

If you enjoyed Calculi, please take some time to leave a review. Feedback is always appreciated for future updates. 4.0 12/08/2022 This small update addresses the following issues:
- Moved the angle measurement option to the calculator screen
- Music will no longer stop playing in the background when Calculi launches
- Improvements to keyboard shortcuts 3.6.1 03/26/2022 This significant update introduces two major features for Calculi. The first is that Calculi now supports unit conversions! You can now easily convert units from 17 different categories such as length, area, and volume.

The second is that Calculi is now available on tvOS! You can now go to the App Store on your Apple TV and download an optimized version of Calculi for your big screen complete with a history tape and verbal feedback.

You can also find the following improvements:
- The original Calculi icon can now be set as an alternative
- Redesigned detail tip screen on watchOS
- Fixed an issue with sending calculations in the iMessage app
- Fixed an issue when the history is empty
- Improved button input speed when sound is on
- Fixed an issue when an empty history tape could cause the app to crash
- Dynamic type improvements

If you enjoyed Calculi, please take some time to leave a review. Feedback is always appreciated for future updates. 3.6 02/09/2022 This small update includes the following improvements:
- Fixes an issue where the iMessage app was not available
- Improvements to the constants screen layout
- Adds compatibility with iOS 15.1, iPadOS 15.1, and watchOS 8.1 3.5.2 11/01/2021 This small update includes the following:
- Improvements to the tip jar
- Fixed an issue on watchOS
- New history animations on iPadOS
- Updated alert for left-handed mode on iPadOS
- Delete gesture added to the iMessage app 3.5.1 10/27/2021 This update introduces the following features and improvements:
- Calculi is now available on watchOS and includes a tip calculator and counter.
- You can now easily share calculations using the new iMessage app.
- There is a new left-handed mode on iPadOS.
- The history view displays an item when there are no saved calculations.
- If you enjoy using Calculi, consider giving a tip to support further development of the app using the new tip jar.
- Expressions from the history view can now be used again.
- Calculi now supports the system font size (dynamic type).
- A new “What’s New” screen and an improved onboarding experience have been added.
- Long press the display to copy and paste values.
- Long press the equals button to use either the previous expression or the result.
- Fixes an issue with using the previously saved result. 3.5 10/21/2021 This update addresses an issue when Calculi is in slide over. 3.4.1 07/23/2021 In this update, we introduce the Calculi Pro subscription! This grants you access to:
- App themes
- Colorful custom icons
- Dark mode can be set as the default

Other notable improvements include:
- Improved constants UI
- Redesigned settings screen
- Haptics can be turned off
- New error notification 3.4 06/28/2021 Calculi 3.3 introduces improvements across the app on iOS and iPadOS. You can find the following improvements:
- New app icon!
- The calculation history has been modernized. You can now drag and drop calculations as text into other apps (iPadOS only).
- Calculi now makes use of the system share sheet.
- Individual calculations can now also be shared.
- The calculator layout is now uniform across all device sizes.
- Information on common mathematical subjects has been added.
- The release notes and about section have been improved.
- You can now easily share a link to Calculi in the settings.
- Units are now included with constants. 3.3 12/02/2020 In this this supplemental update to version 3.2, you can find the following fixes and improvements:
- Improved compatibility with iOS 14. You can now hide the calculation history on iPad.
- The delete button now scales appropriately on iPad.
- UI for history selection has been modernized.
- Expressions are now properly centered. 3.2.1 09/21/2020 In this iPadOS focused update, Calculi now offers support for external keyboards and trackpads! You can also find the following improvements:
- Compatibility with iOS 14
- Improvements to multi-line expressions
- UI improvements 3.2 09/18/2020 This update addresses a small bug fix.

In the previous update, several new features and enhancements have been added to Calculi:
- New light and dark mode
- Multi-line expressions
- Multiple window support
- Updated settings screen
- Fixed an issue with smaller devices
- Numerous other bug fixes

If you enjoyed Calculi, please take some time to leave a review. Feedback is always appreciated for future updates. 3.1.1 08/08/2020 In this exciting new update, several new features and enhancements have been added to Calculi:
- New light and dark mode
- Multi-line expressions
- Multiple window support
- Updated settings screen
- Fixed an issue with smaller devices
- Numerous other bug fixes

If you enjoyed Calculi, please take some time to leave a review. Feedback is always appreciated for future updates. 3.1 08/05/2020 Thank you all for those who submitted feedback on Calculi! This small update addresses the following:
- Fixes an issue with devices running iOS 13.1 that caused the app to crash on start
- Fixes an issue that caused the app to crash when the '=' button was tapped twice
- Fixes an issue that caused certain expressions to not calculate

Finally, feedback is always appreciated. If you have any questions or comments, please be sure to email them at support@naxapps.com. 3.0.1 01/30/2020 Calculi v3.0 is finally here! Rebuilt from the ground up for iOS 13, this new version brings a refreshed design and a numerous performance improvements. Support for all of the latest iOS devices is included in this update. Additionally, this new update provides the groundwork for new features coming in future updates.

If you enjoyed Calculi, please take some time to leave a review. Feedback is always appreciated for future updates. 3.0 01/16/2020 - UI improvements 2.4.1 10/23/2017 - Added the ability to use any previous answer from the calculation history
- iOS 11 improvements 2.4 10/10/2017