Find out how much time you gain because of the effects of relativity on Earth.

This app was built as part of a special BBC 4 programme on gravity. It uses your current location to work out how much your personal clock is affected by Albert Einstein's theories of special and general relativity.

The app calculates the difference in the rate at which time flows for you compared to someone standing still at sea level (measuring what is known as International Atomic Time) - the app shows how quickly or slowly you are ageing compared to this person.

App features:
* Records how much time you have gained as a result of general and special relativity.
* Displays the time gained per day.

The app uses your current location to calculate how your rate of ageing varies. This takes into account both your location and speed. The app records your location when it is open, and in the background to get a more accurate understanding of your own personal clock. We have worked hard to make this background collection of locations have as little impact on the battery life of your device as possible, while also providing you with the option to turn background updates off. Continued use of GPS running in the background can dramatically decrease battery life.

What’s New

Version 1.02.05

Thank you for your support and for providing values for the TV programme. This release contains changes to the way the general and special relativity time dilation values are calculated, as well as bug fixes. When installed, your current general and special relativity values will be reset to use the new equations.

Ratings and Reviews

5.0 out of 5
7 Ratings

7 Ratings

Z1983 ,


An excellent App which allows a “non-scientific” person to visually understand a very complex principle of our reality.


Pervasive Intelligence Ltd
18.5 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
This app may use your location even when it isn't open, which can decrease battery life.
© 2017 University of Surrey


  • Family Sharing

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

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