Digit Ratio

Digit Ratio (2D:4D)

Only for iPhone

Free · Designed for iPhone

iPhone

A now widely studied putative marker for prenatal sex hormones exposure or, more precisely, for the relative exposure to testosterone compared to estrogens while in uterus, is the second-to-fourth digit ratio (2D:4D), that is the ratio between the index (2D) and the ring (4D) fingers. Digit-ratio app is a tool to obtain anonymous measurements of digit ratios (2D:4D). Earlier studies that have stood the test of replication have reported that 2D:4D varies by sex and ethnicity but that male 2D:4D tends to be lower than female 2D:4D in all ethnic groups and the effect is strongest in the right hand. These differences emerge prenatally and appear to be stable during the developing years. While a number of failed replications have been reported, 2D:4D appears to be successfully associated with cognitive abilities, impulsivity, aggression and risk-taking, among other effects on personality and cognition. The objective of the research project is to collect anonymous measurements from multiple individuals. The measurements and profile data may be sent to a server for research purposes. No image will be sent.

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This app has been updated by Apple to display the Apple Watch app icon. Updated detection algorithm and CSV export format.

Version 1.0.2

The developer, Everyware Apps, 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

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    Accessibility

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    Information

    • Provider
      • Everyware Technologies S.L.
    • Size
      • 37.1 MB
    • Category
      • Business
    • Compatibility
      Requires iOS 9.0 or later.
      • iPhone
        Requires iOS 9.0 or later.
      • iPod touch
        Requires iOS 9.0 or later.
      • Mac
        Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.
      • Apple Vision
        Requires visionOS 1.0 or later.
    • Languages
      • English and Spanish
    • Age Rating
      4+
    • Copyright
      • © Everyware Technologies
  • Developer Website

    • More by Everyware Apps

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