Calki: Smart Camera Calculator

Calki: Smart Camera Calculator
The ad-free calculator app that scans numbers, converts units, and gets out of your way.
Calki combines a powerful camera number scanner, a full-featured unit converter, and a beautifully designed calculator, all in one lightweight, 100% ad-free app. No banners. No pop-ups. No interruptions. Ever.
UNIT CONVERTER
Convert across 12 categories instantly: Length, Weight, Volume, Temperature, Speed, Pressure, Power, Force, Energy, Area, Time, Currency. Built directly into Calki: no switching apps, no extra downloads. Need something specific? Create your own custom units for any category, tailored to your workflow.
CAMERA NUMBER SCANNER (OCR)
Point your camera at any receipt, document, or screen and grab numbers instantly.
Op-Mode: Auto-apply an operation (+, -, ×, ÷) after every scan, ideal for tallying receipts or batch entries.
Auto-Detect: Rapid-fire scanning that locks onto the dominant number on screen.
Manual Mode: Preview and confirm each number before it enters your calculation.
Scanner also works inside Converter Mode, scan a value and convert it on the spot.
Limited Time: Premium Scanner features are FREE for two months.
SMART CALCULATOR
Live Preview: Expression and result update in real-time as you type.
Advanced History: Label calculations, double-tap to reuse results, long-press to edit past expressions.
Bulk Actions: Multi-select clear and save to keep your history clean.
THEMES & CUSTOMIZATION
Choose from a curated set of professional fonts and elegant themes. Prefer something with personality? The Retro Theme now includes an optional CRT scanline effect: a nostalgic nod to classic calculators, built for modern screens.
TICKER DISCOVERY SYSTEM
Calki keeps its interface clean and clutter-free, no tutorial pop-ups, no intrusive onboarding. Instead, a subtle ticker system surfaces hidden features and tips right when they're relevant. Each ticker quietly deactivates itself once you've used the feature it's pointing to, so the hints always stay fresh and useful. If tickers feel distracting, you can turn them off entirely from Settings.
WHY CALKI?
100% Ad-Free, forever, no exceptions
Privacy first, minimal data collection limited to feature usage and error reporting, so we can keep improving the app
Discover powerful features naturally, without pop-ups or forced tutorials
Haptic feedback and smooth animations throughout
Fast startup, lightweight, optimized for all devices
Ideal for students, professionals, travelers, and everyday use
Download Calki: the smarter, cleaner calculator app.