Numera

Calculator, currency, units

Only for iPhone

Free · Designed for iPhone. Not verified for macOS.

iPhone

A calculator that keeps up with how you actually think: add brackets after the fact, pull any past result back, and convert currency or units without leaving the keypad. Numera is a calculator for people who do more than add up a shopping list — and who would rather not fight their calculator to do it. BRACKETS, AFTER THE FACT One bracket key that always shows what it will do. Open a group, nest another, close it — or, when you have already typed something and realise it all needed to be multiplied, wrap what is on screen without retyping a character. 12 + 3 becomes (12 + 3), and then × 4 gives 60, not 24. A HISTORY TAPE THAT DOES SOMETHING Every result you commit stays on a tape above the display. Tap a line to copy it. Press and hold to load it straight back into the calculator and carry on. Swipe to delete. The tape survives relaunches and never leaves your phone. CURRENCY THAT WORKS ON A PLANE Rates come from the European Central Bank and are cached on your device, so conversion works with no signal at all. The rate and the date it was published are shown with the result — you always know how current the number is. UNITS, EXACTLY 61 units across length, mass, area, volume, temperature, speed, time and data, converted with exact ratios rather than rounded constants. An inch is exactly 2.54 cm. Arithmetic works here too: type 2.5 × 4 and convert the result. DETAILS THAT ADD UP Decimal arithmetic, so 0.1 + 0.2 is exactly 0.3. Tap any value to copy it. Hold minus to flip the sign of a result. Press equals repeatedly to repeat an operation. Four app icons, optional haptics and key sounds, and separate decimal settings for money and units. QUIET BY DESIGN No ads. No accounts. No purchases. No analytics, no tracking, no data collection of any kind — there is nothing to consent to. Numera is free because it was built to be used, not monetised. iPhone only, and deliberately so.

Ratings & Reviews

  • This app hasn’t received enough ratings or reviews to display an overview.

The developer, PAUL AURELIUS RONDEL, 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.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • PAUL AURELIUS RONDEL
    Size
    • 904.2 KB
    Category
    • Utilities
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    • English
    Age Rating
    4+
    Copyright
    • © 2026 Paul Rondel
  • Developer Website
  • Privacy Policy