All in One (aio) Calculator is the most complete calculator in the App Store. Ideal for every day use or more complex needs. The app is free and without ads. It's an easy to use and modern calculator with a unique combination of features.

General features
• Available on all iPad, iPhone and iPod devices
• Sidebar and Tab bar for easier navigation and sharing of data
• Drag and Drop from Sidebar to the edge of the screen to create new window
• Context menu option to create new window from Sidebar entries
• Pinch gesture on Sidebar entries to create new window
• Drag a calculator button to the edge of the screen to create a new calculator window
• Widget showing recent results
• Scribble
• Stage Manager
• Multiple Windows
• Context Menus
• Multitasking
• Quick Notes
• Capture text
• Keyboard shortcuts
• Pointer interaction
• Two finger swipe for quick editing in Unit Converter and History
• Slider for precision control
• Full support for drag and drop
• Light and Dark appearance
• Quick Guide for easy onboarding
• Toolbar for easy access to many features
• Accessibility features like VoiceOver and Voice Control
• Speak available for all results
• Home screen icon for quick actions (3d Touch)
• Delete button for easy editing
• Undo and redo
• Adjustable precision for decimal results
• Spotlight Search
• App Intents for use with Shortcuts

Calculator Views
• Views for Standard (Infix), RPN and Programmer
• Context menu provides easy access to many features
• Statistic functions (average, standard deviation and more)
• Expression editing
• Share results; including using AirDrop
• Common memory functions
• View contents in memory
• Multiline expression in portrait and landscape
• Simple layout in portrait and a more advanced layout in landscape
• All calculator functions available in portrait (don't need to rotate the device)
• Various button styles
• Change location of number pad for better accessibility

Unit Converter
• Close to 500 units in 37 measurements; including Currency
• Share results with others or paste back into the calculator for further use
• Two finger swipe for quick editing
• Context menu provides easy access to many features

History
• History (paper tape) feature allows you to see and use previous calculations
• Annotate history entries to remember what they were
• Search in history
• Share results with others or paste back into the calculator for further use
• Two finger swipe for quick editing
• Context menu provides access to many features

Info feature
• Detailed description of the app available in all features
• Table of contents and search allow you to find topics of interest

RPN
• Shows as many rows in the stack as needed
• Shows the expression that generates the result
• Drag and drop among rows
• Buttons to manipulate the stack
• Context menu provides easy access to many features

Programmer
• Support for hexadecimal, octal and binary number systems
• Manipulate individual bits
• Many bitwise operators
• Shows equivalents ASCII and Unicode characters
• Context menus provides easy access to many features

Fractions
• Fractions can be converted to different forms; including decimal
• Fraction keys can be changed to other keys in portrait mode
• Works with decimal numbers and fractions

You no longer need a several calculators; nor a unit converter. Future updates will continue to add more features.

Enjoy our app that, as always, is free and without ads!