Enjoy our New Website Launch Promotion For Vinca, Vinca II & Butterfly only at Femometer.com. Coupon will be applied at checkout automatically!
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Femometer Vinca

Smart Basal Thermometer for Better Fertility & Ovulation Tracking

Automate BBT Data Recording & Charting

Femometer Vinca sends data automatically from the tip of your basal thermometer to the Femometer app via Bluetooth. A BBT chart is always there in the app drawn from your measured data and the app will analyse data to unveil your fertile window & ovulation. 

Accurate & Fast Measurement

Take the 1st minute of your morning each day before getting out of the bed to get the most accurate BBT reading. Vinca's high precision up to 0.09℉(0.01℃) and fast measurement as short as 30 secs ensure the accuracy & efficiency are always there~

Also, Femometer Vinca has no switch or button but an adjustable alarm inside to remind you of "Never miss taking a reading!". Pull up or down the lid to switch it on or off.

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* Shipping is currently unavailable for Vinca II & Butterfly in Asian Market, Australia, New Zealand & Switzerland
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Why Vinca?

  • "Precision & Efficiency 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 Knows 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 Vinca
    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 & Return Policy


    Standard shipping fulfilled by Amazon. Your order generally will arrive in 3-5 days.

    Free shipping for all orders. Free return & refund.

    Rest of the World
    Free shipping for orders over $30. $10 shipping fee for orders of $30 or below. 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 support@femometer.com for further information.

What people think of Vinca

Customer Reviews

5 Based on 4 Reviews
5 ★
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Rosa Glover

Best fertility app and BBT thermometer I've ever used

I cannot rate this app and thermometer highly enough. I've been trying to get pregnant for 5 years and I've finally found out why I've not been successful, and it's all thanks to the personalized insights I got from the app. I shared my data with a healthcare professional and they were able to give me the help I needed. I love the Vinca II and can't wait to try the Ivy product once it's released. Thank you so much Femometer!


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.