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Find out your pre-natal testosterone level relative to friends or globally. The app is measuring your ratio of index and ring fingers and compares your data to others.

We've developed the app to help everyone measure their relative testosterone/estrogen levels based on the previous research in the field of development biology. The primary point of the app is to help you with understanding what the ratio of your fingers could mean for you.

There are several papers that talk about how ratio of index and ring fingers point to levels of testosterone and estrogen in prenatal bodies.

Males and females generally have different finger proportions. In males, digit 2 (index finger) is shorter than digit 4 (ring finger), but in females digit 2 is the same length or longer than digit 4. The second- to fourth-digit (2D:4D) ratio correlates with numerous behavioral and physiological conditions.

The app is designed for entertainment purposes only.

Ratings and Reviews

1.0 out of 5
1 Rating

1 Rating

vnrrn ,

Doesn’t work

App does nothing.

App Privacy

The developer, the Digitalists Interactive Agency Ltd, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

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

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