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ENDL is an observational research study at Columbia University to understand the relationship between quality of life, the menstrual cycle, and pain.

Columbia University invites you to join this study to enhance understanding about the relationship between the menstrual cycle, pain, and quality of life.

You can participate in short daily and longer monthly study surveys at your convenience using the ENDL app. You can stop participating at any time.

How this study works:
- You will be able to join the study after signing the consent form.
- We will ask you to answer a daily survey every day for at least 90 days.
- We will ask you to answer a monthly survey every month for at least 3 months.
- All information collected will be stored separately from user name using an id number.

Who is eligible to participate?
- Adults who have reached the onset of menarche, that is, who have had at least one menstrual period.
- Those over the age of 18

Who is running this study?
- Researchers from Columbia University’s Department of Biomedical Informatics as part of the Citizen Endo research project.

ENDL – A study to understand the relationship between quality of life, the menstrual cycle, and pain

What’s New

Version 1.3

This app has been updated by Apple to display the Apple Watch app icon.

Improved on-boarding screens.

Ratings and Reviews

5.0 out of 5
2 Ratings

2 Ratings

App Privacy

The developer, Noemie Elhadad, 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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