Nirvana Solutions product

Change any digit.
Keep your flow.

Calculate Smart is the App Store title. After installation, the icon is labelled Calculate+. It brings editable calculations, specialist tools, converters and local history into one focused app.

Calculate Smart standard calculator interface

A calculator that works the way you think.

Move the cursor through a complete expression, replace a digit or operator, and see the result update without starting again. Switch between Standard, Scientific, Fractions, Percentage, Currency and Unit Converter when the task changes.

Calculation drafts, settings and history stay on your device. The app has no advertisements, account, analytics, tracking, subscription or payment. Only Currency uses the internet, requesting public Frankfurter reference rates that are cached for offline use.

Editable expressions

Place the cursor precisely, select content and correct calculations in context.

Specialist calculators

Use scientific functions, exact fractions and guided percentage calculations.

Practical converters

Convert common units and use cached currency reference rates.

Private local history

Search, reopen, pin, annotate and export calculations you choose to save.

Personal appearance

Choose themes, button shapes, number formatting and display precision.

Accessible input

Use VoiceOver, larger text and physical-keyboard controls on supported devices.

Inside the app

One workspace for everyday calculations.

Calculate Smart standard calculator screen
Editable standard calculations
Calculate Smart scientific calculator screen
Scientific functions and expressions
Calculate Smart fractions calculator screen
Exact fraction calculations
Calculate Smart unit converter screen
Practical unit conversions