Great Calculator
Fast easy to use and so many useful quick tools
Callie calculator
A+. Very simple to use and very functional
Great app!
This is so helpful when I’m shopping and trying to keep on my budget!
Free
In-App Purchases
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About
This app offers a comprehensive suite of calculation tools, including classic math, unit conversions, and financial planning features. It provides instant, accurate results in a clean, fast interface designed for everyday use. The app prioritizes privacy by working entirely on-device without requiring accounts or tracking.
✓Classic calculator with history
✓Unit conversion for various metrics
✓Financial calculators (loans, tips, savings)
✓Date and age difference calculator
✓Privacy-first, on-device operation
✓Clean dark interface
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What's New in Callie
2.1
July 15, 2026
Callie 2.1 makes everyday calculation faster and more personal. • A redesigned expression calculator with conventional percentages, repeat equals, persistent memory, history, and keyboard support • A new Algebra (CAS) workspace for simplifying, expanding, factoring, solving, differentiating, and integrating supported expressions • Floating liquid-glass calculator controls and four themes with custom colors • A purpose-built iPad calculator layout • Improved ad-banner clearance, localization, accessibility, and stability
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In-App Purchases
$0.99
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FAQ
What types of calculations can Callie perform?
Callie can perform classic math calculations, percentage calculations, unit conversions for length, weight, volume, temperature, and speed, as well as financial calculations like loan payments, tips, and savings.
Does Callie require an internet connection or an account?
No, Callie is designed to work entirely on-device. It does not require an internet connection or any sign-ups or accounts, ensuring your privacy.
Is Callie suitable for everyday use on an iPhone?
Yes, Callie is optimized for iPhone with layouts that scale cleanly and controls sized for comfortable one-handed use. It features a clean dark interface for a focused user experience.
How does Callie handle user privacy?
Callie is privacy-first by design. It does not collect any personal data, does not use tracking or analytics, and works entirely on-device, meaning no information leaves your phone.
What is the update frequency for Callie?
Callie was last updated on December 18, 2025, with version 1.0. Future updates will depend on the developer's release schedule.
What devices does Callie support?
Callie is designed for iPhone and iPod devices. It is optimized for various screen sizes and orientations within these platforms.
What is the age rating for Callie?
Callie has an age rating of 4+, making it suitable for a wide range of users, including children and adults.
Does Callie have ads?
No, Callie does not contain advertisements. It is a free app designed without distractions.
