The First in-ear BBT Thermometer

BBT data can be used in ovulation prediction,

natural family planning, and understanding

female hormonal change.



Vanessa Xi
Founder & CEO

I started YONO because of my own experience trying to conceive. I know the challenging process of trying to become pregnant. YONO knows your body and brings value to women’s lives.

Nanette LaShay, MD
Medical Advisor

As an OB/GYN, I believe it’s very important that women understand their body. With the latest YONO technology, capturing and recording reliable data of women’s body becomes convenient. I’m excited to be involved in YONO.

Gemma M.
Preparing for next baby

Can’t wait to use YONO wearable and APPs to get my Basal Temperature automatically captured everyday and charted every month. It will be a relief not to have to wake up to take my BBT every morning. I believe my next journey getting pregnant will be much easier with products from YONO.

How YONO Works?

YONO measures and records your Basal Body Temperature seamlessly and effortlessly. BBT data can help you with fertility tracking, natural family planning and hormonal health monitoring.



YONO Fertility User Instruction

Fertility Companion, Ovulation Calculator & Period Tracker


Read the detailed instruction through YONO app. Or check it here.


Press & Praise

Real words from media!

Media Coverage