Pearl Fertility app

An app to identify high fertility days.

Pearl Fertility By Colorimetrix Inc.
  • Diary/tracking (for menstruation, test results and sexual intercourse)
  • Reminders (optional notifications for menstruation, testing, fertility and overdue period)
  • Graphs and reporting (menstrual cycle calendar, graph of hormone measures in conjunction with ‘fertility’)
  • Uses artificial intelligence 

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Country of origin  Germany
Clinical review 


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User reviews 


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Security and privacy Does the app:
  • collect medical information? Yes (but does not collect any personally identifiable information)
  • require a login? No
  • have password protection? No
  • have a privacy policy? Yes
  • require internet access? No
Read more safety tips around health apps.
Cost App is free, but users must order Pearl Fertility Kit. Cost for 1 month is 39.99 euro (about NZ$66). Refill kit for 3 months is 89.90 euro (about NZ$150).

What does the app do?

Pearl Fertility is a fertility app you can use to monitor your hormone levels via urine (pee) testing to track your menstrual cycle. This may help with conception by identifying potentially fertile days. You can precisely map your hormonal cycle by using a purchased test kit (FSH and LH from urine/pee sample each morning). The app will notify you about your highly fertile days – information that potentially increases the likelihood of planned conception. The app uses artificial intelligence to detect Pearl strips via phone camera. Inbuilt timer to allow for test strip to develop.

Note: This app specifically states it is not to be used for contraceptive purposes, and also advises you to seek medical advice if you have not conceived within 6 months.

For the complete app description, go to the app website, Google Play, App Store or, for a more detailed review, see Reviews


✔ Nicely designed app that is easy to use.

✔ Handy to have ability to use artificial intelligence (AI) to scan testing strips, to minimise risk of user error.

✔ Clear graphical description of chances of getting pregnant (small, some, good or high).

✔ Uses scientifically sound information to allow for accurate monitoring of hormonal cycle.

✘ It is noted on the website that Pearl has been tested in a clinical setting in the US and approved by an independent review board. However the results have not been published as yet, so there is no available data to support use.

✘ Progesterone testing strips are not included in the Pearl Fertility kit, but the app is compatible with a particular brand (purchased separately) to confirm ovulation has occurred.

✘ Some user reviews describe issues with functionality, eg, app camera not working to detect testing strips. However, it seems the support team worked with users to help solve these issues.

Review details

Date of review: April 2021
Platform reviewed: Android
Version: 1.5.466 

App developer
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Credits: Health Navigator Editorial Team. Reviewed By: Dr Arna Letica, FRNZCGP, Auckland Last reviewed: 06 May 2021