Meet Callie – All-in-One Calculator. A friendly, simple calculator app that keeps everyday math in one place. Switch smoothly between a classic calculator, a scientific calculator, and a handy unit converter, plus quick everyday tools. No clutter—just fast, reliable results when you need them.

Why choose Callie?
• Friendly and simple: clean layout, big buttons, and clear results.
• All-in-one convenience: calculator, scientific calculator, and unit converter together.
• Quick calculations that save time for everyday tasks.
• Multilingual: Callie follows your device language and speaks 13 languages.

Classic calculator
The everyday calculator you expect—made easier to read and quick to use. Great for totals, percentages, discounts, and daily number crunching.

Scientific calculator
When you need more power, switch to scientific mode. Calculate with trigonometry, powers and roots, logarithms, and parentheses—useful for study, work, or any time you need a scientific calculator.

Unit converter
Convert commonly used measurements in seconds. Switch between length, weight (mass), temperature, volume, and more. The unit converter is built in, so you can convert values right after you calculate them.

Quick calculations
Finish everyday tasks faster with ready-made helpers:
• Tip calculator and bill split
• Percentage calculator and discount
• Age calculator

Designed to feel natural
Callie starts fast and stays out of your way. It’s a calculator app you can trust: consistent, accurate, and easy to use with one hand.

Made for everyone, everywhere
Callie supports 13 languages and follows your device settings:
English (en), Spanish (es), French (fr), Italian (it), German (de), Greek (el), Korean (ko), Japanese (ja), Chinese—Simplified (zh), Arabic (ar), Portuguese—Brazilian (pt), Swahili (sw), and Kinyarwanda (rw).

Who is Callie for?
• Students who need both a simple calculator and a scientific calculator.
• Shoppers who want quick percentage and discount math.
• Cooks and DIYers who convert units with confidence.
• Anyone who prefers an all-in-one calculator that just works.

What you can expect
• Clear, readable interface
• Accurate results
• Thoughtful defaults
• Helpful shortcuts

Callie keeps your calculations simple—and puts a classic calculator, a scientific calculator, a unit converter, and quick everyday tools in one friendly place.

Try Callie today and make everyday math easier.