Callie - All in One Calculator

allie is an all-in-one calculator app designed for everyday use on iPhone. It combines a powerful classic calculator with practical financial, conversion, and planning tools — all in a clean, fast interface built to stay out of your way. Whether you’re doing quick math, converting units, calculating tips, estimating loan payments, or planning savings, Callie delivers accurate results instantly without requiring an account or internet connection. Calculator & Math Tools • Classic calculator with memory and calculation history • Percentage calculator and percentage change tools • Unit price comparison for smarter shopping • Date and age difference calculator Unit Conversion • Length, weight, volume, temperature, and speed conversion • Metric and imperial units supported • Clear, readable results with fast input Finance & Money Calculators • Tip calculator and bill split calculator • Loan payment and interest calculator • Sales tax and discount calculator • Fuel cost estimator • Savings and compound interest calculator Designed for iPhone Callie is optimized for iPhone with layouts that scale cleanly across screen sizes and orientations. Controls are sized for comfortable one-handed use, with clear spacing and readable text that stays consistent throughout the app. Privacy-First by Design • No sign-ups or accounts • No tracking or analytics • No personal data collected • Works entirely on-device Simple, Fast, and Focused • Clean dark interface • Instant calculations • No clutter or unnecessary features Callie is built to be a reliable everyday calculator — one app that covers math, conversions, and financial calculations without distractions.