Why choose OvuFirst

Our family of OvuSense fertility monitors help you from the first step on your journey right through to supporting you if you need clinical help.

If you've just started out or know you have regular ovulation, our OvuFirst sensor is designed just for you. It is a completely unique patented sensor technology designed to measure your skin temperature while you sleep giving you a really good understanding of the fluctuations in progesterone which occur during your cycle.

Trust the OvuSense science

We took our revolutionary OvuCore technology proven in over 191,000 cycles of use, and used it to develop and test the best skin sensor available on the market.

Our studies prove the OvuFirst sensor enables your OvuSense App to confirm your fertile window with over 90% accuracy, using this information to provide you with a full 8-day fertile window at the start of your next cycle.

Join the OvuSense family today and choose OvuFirst if you're just starting out.

How does OvuFirst work?

Tracking your cycle in real time

Cycle 1

Start using OvuFirst immediately by downloading data from your sensor each morning to the OvuSense App. Your temperature is tracked in real time.

Within a few days of ovulation, your OvuSense App will use your OvuFirst sensor to confirm the ovulation date. You can continue to use OvuFirst to monitor your temperature (and from it your progesterone levels) during your luteal phase.

Real time cycle tracking app - Cycle 2
Real time cycle tracking app - Cycle 1

Cycle 2

Start your new cycle in your OvuSense App. OvuSense will then predict the 8 days you are most likely to conceive in this cycle. You can continue to use your OvuFirst sensor during your period.

The OvuSense App updates the information it provides in real time during the cycle, replacing the 8 day 'long range' window once it is able to confirm ovulation took place.

Scroll on the OvuSense App to compare your ovulation dates and your cycle pattern. Real time data can be shared with your partner and/or a medical professional through the OvuSense Pro clinician portal.

Read about women already using OvuSense

Meet the OvuSense fertility monitoring family

Click on one of the boxes below to find out more about the other members of the OvuSense family.

Which fertility monitor is right for me?

Compare OvuSense with other methods for monitoring your ovulation and reproductive cycle.

As you consider which fertility monitor fits you best some typical things to consider are:

  1. How large a fertile window will it detect so you can maximize the time when you're trying to conceive
  2. How accurate is it at confirming ovulation - the less accurate the less chance of it helping you in your next cycle
  3. Can it predict ovulation using the current cycle data - something we like to call realtime prediction
  4. Does the system work for PCOS and irregular cycles
  5. Can it help your doctor screen for fertility issues
  6. Can it help you and your doctor monitor your medication or treatment

Each of the statistics quoted below are derived from clinical evidence available on fertility monitoring methods and products. Pro refers to the OvuSense Pro clinician portal. Click on the 'i' icon next to each method in the table, or directly on the method in the table on mobile devices to find out more about the clinical evidence.

  Feature/ How many does it get right
Fertile window prediction days
Confirms ovulation
Live ovulation prediction
PCOS and irregular cycles
Screen for fertility issues
Track medications and treatments
OvuSense OvuFirst
(Skin-Worn Temperature)
OS First 8 days 8 days 90% 90%   Pro
OvuSense OvuCore
(Core Body Temperature)
OS Core 8 days 8 days 99% 99% 96% 96%   Pro Pro
Fertility Tracker Apps FTA 4-6 days 4-6 days 21% 21%
Basal Body Temperature BBT 6 days 6 days 83% 83%
Skin Worn/
Fertility Bracelet Devices
SW/ FB 6 days 6 days 78% 78%
Ovulation Predictor
Kits and Monitors
OPK/ OPM 4-6 days 4-6 days 92% 92%
Serum Progesterone SP 4-6 days 4-6 days 100% 100%
Ultrasound US 6 days 6 days 100% 100% 100% 100%

Fertility Testing Methods Key

  • OS First OvuSense OvuFirst (SkinTemperature)
  • OS Core OvuSense OvuCore (Core Body Temperature)
  • BBT Basal Body Temperature
  • FTA Fertility Tracker Apps
  • SWD Skin Worn Devices
  • FBD Fertility Bracelet Devices
  • OPK Ovulation Predictor Kits (urine strips)
  • OPM Ovulation Prediction Monitors (urine strips)
  • SP Serum Progesterone
  • US Ultrasound