Dual Split-Screen Side by Side
Two clean calculators side-by-side, so you can compare numbers, transfer results between panels, and keep moving. No clutter, no unnecessary features.
Free
Calculate your share on one side, your friend's on the other. No switching back and forth.
Unit price on the left, total on the right. See which deal is actually better.
Original measurement on one side, converted value on the other.
Do the same calculation twice. Make sure you got it right.
One tap moves results between calculators. No copy-paste needed.
Each calculator keeps its own calculation history.
Add, subtract, multiply, divide. The essentials, done right.
Works smoothly on iPhone and iPad, side-by-side or stacked.
Copy any result with a tap to paste wherever you need it.
No data collection. No accounts. Just math.
"Most calculators keep adding 'features' that slow you down. This one stays focused: quick, readable, and practical."
Dual split-screen side-by-side calculator
It puts two independent calculators on one screen so you can compare numbers, run two calculations at once, and transfer results between panels. In landscape the calculators sit side-by-side; in portrait they stack.
Tap the arrow button to transfer the current value into the other calculator. The arrows adapt to your layout: left/right in landscape, up/down in portrait. You can also copy any result to the clipboard.
Yes. Each calculator keeps a separate history of recent calculations (up to 20 items). History is not persisted across app launches.
Yes. Multiplication and division are evaluated before addition and subtraction, so 2 + 3 × 4 = 14, not 20.
It's free, with no ads. It's part of the "Not Another" app family.
No. There's no tracking, no accounts, and no data collection. Just math.
June 2026
Get Not Another Twin Calculator free. No subscriptions, no ads.