Sumthing
Calculations stay connected
Only for iPhone
24,99 zł
iPhone
A calculator that remembers your workings. Every calculation stays on a slate — tap to edit, link results together, and watch everything update instantly.
A calculator that remembers your workings.
Sumthing is a slate calculator built for people who think through problems, not just answers. Every calculation stays visible, connected, and editable — 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/
Ratings & Reviews
This app has not received enough ratings or reviews to display an overview.
Unit Conversions
Convert between units right in your calculations. Tap the convert button to transform any number:
• Currency — Live exchange rates for 13 major currencies
• Length — Metric and imperial, from millimetres to miles
• Weight — Grams to tonnes, ounces to stones
• Temperature — Celsius, Fahrenheit, and Kelvin
• Volume — Cups, litres, gallons, and more
• Area, Speed, Pressure, Data Storage
• Lab Units — Medical conversions for glucose, cholesterol, hormones
Conversions appear inline on the slate and update automatically when linked values change.
Also in this update:
• Improved haptic feedback throughout
• Tap any result while building to finalize and branch
• Better error messages (e.g. "÷ by 0")
• Bug fixes and polish
The developer, Simon Belcher, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Size
- 2.1 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later.
- Languages
- English
- Age Rating
4+
- 4+
- Provider
Simon Belcher
- Simon Belcher has not identified itself as a trader for this app. If you are a consumer in the European Economic Area, consumer rights do not apply to agreements between you and the provider.
- Copyright
- © 2026 Apexx Apps
