Calculator

• A running tape where every line stays live — change a number and every line that used its result works itself out again
• Tap a result to drop a #1, #2 reference into the line you are typing, so long sums stay readable
• Select, drag and drop values between lines; put the cursor inside a number and edit it where it stands
• Square root, powers, logs and trigonometry in degrees, radians or gradians
• Live preview of the answer while you type, and a running total of the whole tape
• Your separators, your precision, your theme — and it opens the instant you tap it, with no splash and no ad

Vibrate. The buzz under your thumb. That is the entire permission list, and it is the one we would point at first if you only believed one thing we said.

This is the whole list. Android prints the same thing under Settings › Apps › Permissions once the app is on your phone, and it was not written by us — check one against the other.

Android 8.0 and up. Bought once, yours to keep: no account to make, no subscription, and no upgrade screen inside the app — the key you buy unlocks it and every version after it.