Great Calculator
Fast easy to use and so many useful quick tools
KKaitttttttttttttt
Callie calculator
A+. Very simple to use and very functional
TThejdzt
Great app!
This is so helpful when I’m shopping and trying to keep on my budget!
KKasibeth
Free
In-App Purchases
Details
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
2.2
September 19, 2026
What’s New in This Version Callie got a cleaner, more polished calculator experience across iPhone and iPad. • Redesigned Basic calculator with larger, clearer controls • Improved calculator behavior for more natural everyday use • Live thousands separators as you type • Refined Scientific mode with a dedicated landscape layout • Cleaner typography and more modern spacing throughout the app • Improved iPad layouts and better use of screen space • Updated Algebra/CAS presentation • Smoother, lighter calculator rendering • Removed the persistent banner ad for a less cluttered experience • Refined appearance customization and visual consistency • General bug fixes and performance improvements Same Callie. Less in the way.
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Subscriptions & 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.
