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TrueNorth Labs
Calculate, convert units and add up numbers from photos in one app. Everything runs on your device without a network connection.
Download on the App Store (opens in a new tab)iPhone · iPad · Mac · iOS 18+
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.
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.
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.
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.
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.
Every calculation saved to history — with favorites, filters, and export.
Glassmorphism design, dark/light mode, 7 accent colors, plus haptic and sound feedback.
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 labels for VoiceOver so everyone can use it comfortably.
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.
A simple, easy-to-use smart calculator — on the App Store.