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Know your fertile days from saliva crystals

First signs of your ovulation include tiny fern-shaped crystals in air-dried saliva. You can recognize these crystals with Babyndex and find out when you have the highest chance of getting pregnant.

What is Babyndex?

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Apply a very little saliva to the lens of the microscope that we supply and wait for it to dry. Saliva starts to crystalize when you hit your fertile window.

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Download the application on your smartphone, hold the microscope against the camera and take a picture of the saliva sample. The app recognizes the saliva crystals.

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Fertile days

You can find out when there is a high chance of getting pregnant. Our algorithm analyzes the saliva patterns and determines the probability of crystals.

Is Babyndex right for you?

Only use Babyndex if you are not using hormonal contraception. In this case, your own hormones regulate your ovulation cycle. Naturally, the salinity of your saliva is high on your most fertile days. Babyndex is able to recognize saliva crystal patterns formed by your salts. Use Babyndex if you don’t want to spend a lot on urine test strips. Our ovulation microscope is reusable and our application is free! And use Babyndex if you want to track your actual fertile days in a natural way. Babyndex is the first app capable of recognizing the natural saliva crystals with modern image analysis.

Ways to buy Babyndex

Why is Babyndex so special?

Babyndex is the first mobile app that combines the saliva ovulation test with modern technology to recognize saliva crystal patterns. With the ovulation microscope you can magnify the fern-like saliva crystals and with the app you can recognize them. Babyndex also stores the results in a secure and convenient way. Knowing where in your ovulation cycle you are can improve your chances of getting pregnant. Babyndex can help you get pregnant sooner!


Your saliva crystallizes during your fertile days. Hence women with irregular cycles can also use Babyndex. There is no need for months of body temperature data.



A 2018 study by Harvard Medical School showed that saliva test can predict ovulation with more than 99% accuracy, if complemented with automated crystal detection.



You can use Babyndex as many times as you want. This is environment friendly and you can also save a lot compared to purchasing single-use hormone stripes on the market!

full ferning

What is the saliva fern test?

Your saliva crystalizes during your fertile days. Your body goes through different stages of your ovulation cycle. First the estrogen hormone levels increase and cause that saliva starts to crystalize. These saliva crystals resemble the shape of fern leaves and the whole procedure is called saliva fern test.

Using our high-quality microscope and app, you can detect these crystals in your dried saliva samples. Just try it!

How reliable is the saliva test?

Harvard Medical School studied the effectiveness of the saliva ovulation test combined with automated crystal detection in 2018. The Harvard researchers have concluded that the accuracy of the same solution as Babyndex is higher than 99%. Using this method, we detect estrogen hormone increases in a less intrusive and more affordable way than comparable urine or electrolyte tests. What is more, FDA has already approved saliva test for ovulation prediction, which is what Babyndex is also based upon.


How to detect the fertile days?


Urine LH test


Saliva fern test


Body temperature test

The 5 days before ovulation are the fertile days. The saliva fern test can predict ovulation about 3 days ahead and with Babyndex you can make an even better prediction. The microscope is reusable and affordable. The test is non-invasive and the results show the actual fertile window with an extremely high accuracy of >99 %.

Take the test every day for a full cycle!

Babyndex is easy to use. Make testing your morning routine. Remember to take the test every day for full cycle! Then you can take it regularly during the expected fertile phase. This is how you can get the best results for detecting your fertile days and for getting pregnant.

What our customers say

Who invented Babyndex?

My name is Ákos Bodó, I am an OB-GYN and the co-inventor of Babyndex. I have been helping women with fertility issues for over 50 years. Are you interested in your actual fertile window? Babyndex might help you. During the fertile days, the structure of body mucus changes and dry saliva crystallizes. We have built an application to help you detect these saliva crystals. Plus, we thought it would be necessary to write about actionable tips on how to improve fertility and to reach your desired goals.

So welcome to this exciting journey!

Inventor of Babyndex

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*Running on iOS 11.0 or later and Android KitKat or later

Ordering, Payment, Shipping and Refund

Ordering is without registration.

Payment is via bank card, PayPal and Cash on Delivery for an extra fee.

Shipping is on the same or next business day in Central Europe.
Estimated shipping delivery times: Europe: 1-5 business days, USA, Canada: 5-14 business days, Rest of the world: 7-14 business days

If saliva ovulation test is not working for you after having used it for a whole cycle, please return the microscope and we refund its price.

CE Certification:

Maybe Baby is a Mini Microscope for Ovulation Cycle Observation and bears the CE marking that indicates conformity with health, safety, and environmental protection standards for products sold within the European Economic Area.

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