A TrueNorth Labs app
More than a calculator. Smarter.
From scientific math to tips, discounts, bill splitting, unit conversion, and time-zone calculations — plus on-device OCR, a 71-formula math library, and region-specific tax and payroll tools — with no network, no permissions, entirely on your device.
Download on the App StoreiPhone · iPad · Mac · iOS 18+
Key Features
Powerful Calculation
Scientific functions (sin·cos·tan·log·√·xʸ), single-line expressions, and memory operations, all Decimal-based for error-free accuracy. See the result before you press equals, and switch between RAD and DEG right on the screen. On iPhone in portrait, the ƒ(x) toggle unfolds the scientific and memory keys.
Add Up a Photo
Point it at a receipt or a menu and it reads the numbers and adds them up. Recognition runs entirely on your device, and you can drop or correct any line before sending the total straight to bill splitting.
Beyond a Calculator
Tips, discounts, and bill splitting, unit conversion (8 categories), time-zone calculation (55 cities, automatic DST), date math, unit-price comparison, and stock cost-averaging — in one app.
A Formula Library, and a Quiz
71 formulas across geometry, finance, trigonometry/algebra, physics, and astronomy — enter the values and the answer appears. Diagrams update as you type, and the same formulas generate quizzes that are graded the moment you answer.
Tools for Where You Live
Based on your country of residence: Japan's consumption-tax and invoice tools, seven Korean payroll and savings calculators (take-home pay, insurance, severance, VAT, compound interest, deposits, annual leave), and VAT calculators for China, Germany, Spain, France, Italy, and the Netherlands — all shown automatically.
Calculations That Stick
Every calculation saved to history — with favorites, filters, and export.
Made Your Way
Glassmorphism design, dark/light mode, 7 accent colors, plus haptic and sound feedback.
Anywhere, In Your Language
Korean, English, Japanese, Chinese (Simplified & Traditional), German, Spanish, French, and Portuguese — 9 languages, responsive on iPhone, iPad, and Mac (the scientific panel is always visible on iPad, and appears on Mac as you widen the window).
Accessibility
Accessibility labels for VoiceOver so everyone can use it comfortably.
Your calculations are yours
This app never sends your data anywhere. Even the OCR that reads the numbers in a photo runs on your device. Everything stays on your device.
- No network communication
- No analytics or ad SDKs
- No permission requests
- All data stored on-device