Unit & Currency Converter • Conversion d’unités/devises • Conversión de unidad/moneda • 単位と通貨の変換 • Конвертация единицы и валюты • Conversão de unidades e moedas • 单位和货币换算

Shift Unit is a unit converter designed with usability and numerical precision in mind. It features 1400+ conversion units across 34 categories. It works great in light or dark mode, and as a Home Widget w/ localized number displays.
Independent WatchOS app and complications.

Operations can be carried out in portrait mode in simple precision (7 significant digits,) or in landscape mode in double precision (14 significant digits.)
Conversion formulae use exact definitions of related entities--not approximations.
Wikipedia page information can be pulled for categories and conversion units. (Look for info circle.)

The custom keypad has a calculator mode, and allows to enter/edit numbers on either side of the conversion.
Unit categories include Acceleration, Angle, Area, Bit Rate, Clock, Online Currencies, Data Storage, Area Density, Volumetric Density, Electric Charge, Electric Current, Energy, Volumetric Flow Rate, Force, Frequency, Fuel, Length, Luminance, Lux, Mass Flow Rate, Momentum, Power, Pressure, Radiation Dose, Radioactivity, Radiation Exposure, Speed, Temperature, Temperature Delta, Time, Torque, Typography, Volume, and Weight.

- One screen operation minimizing number of gestures
- Numbers (digits, decimal/grouping separators, exponent)/time/country names localized to your (or any) region
- Current time in 2 out of 439 world cities and see your cities pinned on a flyover map, an educational way of discovering the world through time zones
- Weather conditions and forecast for time zone cities
- Dedicated accessibility labels and hints for VoiceOver operations
- Customizable number entry timeout allowing to enter a new number without having to clear the field. (Turned off when an accessibility feature, e.g. VoiceOver, is on)
- Customizable user interface (preferred categories; user interface alignment for left/right-handed entry or 2-thumb operations)
- Ability to swap units while keeping initial numerical entry
- Category presets for quick change of context, including user preset
- Long-press category button to remove, or add a category on the fly
- Long-press number field for copy/paste
- Paste Mathematical constants (Pi, e, etc.)
- Education via Wikipedia pages for categories and conversion units
- Currency conversions using online rates
- Searchable list of currency rates with possibility to change base rate
- Set favorite currencies
- Built-in numeric keypad (with calculator mode) to enter numbers on either side of the conversion
- Long-press delete key to clear the field in focus
- Engineering number format handling
- Infinity and negative numbers handling
- 7 or 14-digit precision displays (3-digit fractions for currencies)
- Searchable list of 1400+ conversion units across 34 categories
- On-boarding screens for general operations and for the Currency category (turned off when VoiceOver is on)
- Home widget for quick conversions using units selected in the hosting app

Happy Conversions!

What’s New

Version 1.6.2

FIXED: iOS and WatchOS
- Fixed crash issue with the Currency category, and currency rate updates.
Note: MRO (Mauritanian Ouguiya prior to 2018) is not available any more.

Thank you for using Shift Unit!

Ratings and Reviews

5.0 out of 5
12 Ratings

12 Ratings

SK Fervid ,

Must have- Simply Awsome

This is best conversation app available on appstore, Developer is so kind! Just keep updating it frequently and please add auto update of rates whenever we open the app!

Se-x-y-z ,

Almost the only app deserves 5 stars

Shift unit is a tremendously useful app, mixed with neat design and all of that is free. A real 5-Star app.

App Privacy

The developer, Didier Burton, 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 Linked to You

The following data may be collected but it is not linked to your identity:

  • Usage Data
  • Diagnostics

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


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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