Whether you're splitting a dinner bill, plotting an equation, or working through bitwise logic, Calc Engine meets you where you are. A beautiful, fully customizable calculator that grows with you — and syncs seamlessly across every Apple device.
Live results, full history, and a calculator you can shape to fit how your brain works — not the other way around.
Every keystroke updates the answer instantly, so you always know where you're headed. No "equals" required — just keep typing.
Your last 200 calculations across all your devices, automatically saved. Scroll back, reuse a result, or pick up exactly where you left off.
Calc Engine is free to download and use with no ads. Unlock Calc Engine+ once for the full experience — and own it forever.
iPhone, iPad, Mac, and Apple Watch — your history, custom functions, constants, and keyboards stay in sync everywhere.
Calc Engine on your wrist — same expression engine, with your favorited functions and constants pulled from your phone and pinned at the top for fast access at watch size.
Everything syncs through your personal iCloud — nothing is stored on our servers. Fully localized and native on every Apple platform.
One Calc Engine+ purchase unlocks the full experience for everyone in your Family Sharing group.
Mix and match themes, fonts, and key shapes for over 20,000 unique calculator styles. Pick the look that feels right in your hands — a calculator you actually enjoy opening.
Build keyboard pages on a grid — drag a key from a library and mix digits, operators, functions, and constants in one place. Set a long-press alternate on any tile so it handles two actions, name each page and pick its icon, then reorder it alongside the standard pages. Enable or disable any page per device.
A built-in library of math, physics, and engineering helpers — favorite the ones you use often so they're always one tap away.
Define formulas with up to three parameters and name them whatever makes sense to you. Favorite your most-used functions and constants to keep them pinned at the top, ready to insert with a single tap.
Set rounding rules per function — perfect for money, measurements, or anything that needs a clean output.
Trig (radians or degrees), logarithms, exponentials, n-th roots, factorials, mod, abs, floor — there when you need them, out of the way when you don't.
Plot equations like x = y² or sin(x) live as you type, right beside the keyboard. Tap any graph to expand into a full-screen view for closer inspection. A dedicated graphing keyboard with x, y, and = keeps everything in one place — no separate app, no separate mode.
Tap a value, then any two units to see the conversion live — miles to km, lb to kg, °F to °C, gal to L, anything you need. 250+ built-in units across 40+ categories: length, mass, volume, temperature, time, speed, energy, power, pressure, electrical, magnetic, optical, radioactivity, data, and more. Favorite the categories you actually use so they sit at the top — and build your own functions with conversions baked in.
Type x² = 121 or sin(x) = 0.5 and Calc Engine finds every real solution, listed as tappable answers in your history. Tap one to drop it into your next calculation — no separate "solve" mode.
Hex (0x), binary (0b), and octal (0o) literals with a full bitwise toolkit — AND, OR, XOR, NOT, shifts, and rotates. Every result shows in HEX, DEC, OCT, and BIN at once, with configurable word size (8/16/32/64), signed/unsigned views, and a tap-to-expand byte-by-byte bit display.
From live history to the full scientific keyboard to themes that look like you — beautifully designed for daily use.
Same expression engine, your own functions and constants right where you need them — designed natively for each screen size. iPhone, iPad, Mac, and Apple Watch.
A one-time purchase to unlock the full calculator — scientific functions, built-in graphing, programmer mode, your own functions and constants, custom keyboards, and visual customization.
One-time purchase $9.99
Calc Engine+ is an in-app upgrade. No subscription.
Teach it your formulas once. Customize it to feel like home. Use it forever.
