Sumthing

A tape calculator that remembers your workings. Sumthing is a tape calculator built for people who think through problems, not just answers. Every calculation stays on a connected Slate — visible, editable, and linked. Change anything and the entire Slate updates automatically. HOW IT WORKS 1. Enter a calculation using the keypad 2. Tap equals to commit it to the Slate 3. Tap any result to reuse it in a new calculation 4. Edit any number or operator — everything recalculates live THE SLATE • Every calculation stays on the Slate with its full expression • Results link to each other — change one and dependent calculations update • Colour-coded lines make it easy to follow your working • Tap any result to branch a new calculation from it UNIT CONVERSIONS • Convert currency, length, weight, temperature, volume, and more • Live exchange rates for 13 major currencies • Conversions appear inline and stay linked to the Slate • Quick presets: Basic, Extended, or All units • Recent conversions for fast access EDIT ANYTHING • Tap any number or operator on the Slate to edit it in place • All dependent calculations update immediately • Cancel an edit to revert, or clear to remove a line • No re-entering formulas — just fix and continue FLEXIBLE DISPLAY • Wrap mode shows full expressions across multiple lines • Scroll mode lets you swipe through long formulas • Configure decimal places from 0 to 10 with a live preview • Long-press the display to copy the current result DESIGNED FOR FOCUS • Clean dark interface with a muted colour palette • Smooth animations and subtle haptic feedback • Full bracket support for order of operations • Clear handling of negative values Built for people who think with numbers. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/