Preorder Femometer Vinca II, Ivy & Butterfly now and get them in Early August. We appreciate your love~
Femometer Vinca
Femometer Vinca
Femometer Vinca
Femometer Vinca
Femometer Vinca
Femometer Vinca

Femometer Vinca

Smart Basal Thermometer for Fertility & Pregnancy Tracking

Measuring your BBT can be awkward and annoying. We understand. We've tried to make it as easy as we can with Vinca.

- No need to write anything down (or even open your eyes!) as Vinca delivers data straight to your app.

    - She'll even tell you if you're measuring within the correct window of time each day - to help you keep your readings accurate. So easy you could even grab that extra 15-minute snooze if you want to ;)
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    Why Vinca?

    • "Precision & efficiency does matter"

      Your reading can be completed in as little as 30 seconds once Vinca is familiar with you. With a precision of 0.09℉, you can track the smallest of fluctuations. Vinca draws you a clear map of your BBT, so whether you're looking to get pregnant, or know your 'safe zone', Vinca can help you.

    • "SSSHHhhhhhhhh!"

      Vinca beeps to let you know that she's on or off, or that she just finished taking a reading. You can adjust the volume level in app in case you're worried about waking up Sleeping Beauty...

    • "Subtle & Sweet"

      Vinca is designed to be discreet. It looks just like a lipstick, so no one will ever know that you are trying to pinpoint your ovulation unless you want them to.

    • "Data always know where & when to go"

      Data captured. Data saved. Time recorded. Done.

    Work hand in hand with Femometer App

    Use it as a daily log of your cycle. Never forget things.
    Access to your measured data & BBT chart.
    Personal insights & health tips just for you.

    Learn More

    How to use Vinca

    A Smart Basal Thermometer

    Get pregnant faster, avoid pregnancy naturally or just get to know your menstrual health better.

    Watch the Video
    • Download our app, uncap the Femometer Vinca and pair via bluetooth. No need to pair again next time.

    • Put the metal tip of the Vinca under your tongue, keep your mouth closed and try not to move the thermometer around. When you hear three beeps, you've successfully measured your BBT. Now repeat this every morning - before you get out of bed and after at least 6~8 hours sleep.

    • The Femometer app learns from every piece of data you input and calculates your conception rate for each day. The app then provides personlized insights so you can prepare for your fertile window.

    Download our app right now

    Measure, track & learn everything related to your cycle.
    Understand (and love) your menstrual health.

    Product specs

    • Measurements & Dimensions


      Product Name: Femometer
      Model: FM-101-BT
      Size: 108.7mm*22.2mm*16.2mm
      Weight: 17g(without Battery)
      Transmission distance: Up to 16 feet
      Measurement: 89.6℉ - 107.6℉
      Accuracy: +-0.09℉(95℉ - 100.4℉)
      Battery: CR1632
      Receiver: Apple Devices: iphone 5 or above with version at lease IOS 8.0; Android devices: 4.3 or above and supports Bluetooth 4.0/4.1

    • Materials & certification


      Femometer is made by imported ABS material, Seiko Hall IC, 24-digit high accuracy data collection chip, low-energy Bluetooth chip as well as other finest materials, along with the finest craftsmanship, to help deliver the best quality a thermometer can be.

    • Shipping


      Standard shipping fulfilled by Amazon, generally in 3-5 days. Free shipping for orders over $30. $10 shipping fee for orders of $30 and under. Free return & refund.

    • Warranty


      This product is warranted from manufacturing defects for one year from the date of retail purchase. It does not cover damages or wear resulting from accident, misuse, abuse, commercial use or unauthorized adjustment and repair of the product. Please direct all returns to the place of the original purchase and retain your original receipt, as you may be asked to provide a copy as the proof of the purchase. Please contact for further information.

    What people think of Vinca

    Customer Reviews

    5 Based on 3 Reviews
    5 ★
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    Work great with my irregular periods

    I only have one complaint but it's not with the product. To get an accurate reading of your BBT you need at least 6 hours of.solid sleep, which is hard with a new baby so I cant always use it. The product its self is really easy to use. I love that you can use it even with irregular periods, you dont have to have the app open to use it like similar products and the app has tons of features !!!


    Great Product

    I have been temping for many years both for TTC and TTA and have gone through many cheap BBT thermometers. I love that this one syncs to my phone and keeps track of everything. The app is simple to use. I have found that it sometimes isn’t connected to my phone right away but since it keeps record of temps for a decent timeframe it isn’t too much of a pain. I do wish that it had a digital screen on it to read it right away, but honestly for the price, it is perfect!


    Highly recommend for people who's doing TTC

    I recently got off of hormonal birth control and started down the natural family planning route as we prevent before TTC and let my cycles get back to normal. I use this every morning before I wake up, it is on my nightstand I reach over put it under my tongue then put it back, as long as your bluetooth on your phone is on it will sync without you doing anything but taking your temperature. This is the first cycle I used it and it was interesting to see the changes in my temperature versus my fertile period vs period etc. The app is great too as it predicts when you are ovulating and you can upload your ovulation strips and it tells you how high your LH is that day based on your ovulation strip. Would buy again and I recommend it to anyone who's doing natural family planning or TTC.