Armband Size Guide
Upper arm circumference
How to Measure
Size chart
| Size | Inches | cm |
|---|---|---|
| Standard Armband | 8.5″ – 15.5″ | 21.5 – 39 cm |
| Extra-Long Armband | 12.5″ – 18.5″ | 31.5 – 47 cm |
Advanced Fertility Monitor
Free iOS & Android app
Long-lasting coin cell battery
HSA/FSA eligible
2-months Premium trial
Fabric armband + extender included
12-month manufacturer warranty
Armband size
(S/M) Fits 21.5–39 cm / 8.5″–15.5″
Unsure about your size? Our Support Team is here to help.
Protect your Tempdrop
Every Tempdrop includes standard coverage. Add protection for more confidence.
What is the difference?
Choose the coverage that fits you best
Use FLEX at checkout to pay with your HSA/FSA card
before you buy
Orders are generally processed within 1-3 business days.
Once shipped, customers will receive an email with tracking information to monitor the delivery. Please allow 4-7 business days for delivery in the US, EU, and Israel, and up to 2-6 weeks elsewhere (international delivery times may vary).
Unopened and unused items can be returned within 30 days for a refund, minus a $20 refund processing fee.
Optional protection upgrades may include extended satisfaction coverage. Coverage terms depend on the selected plan and should be reviewed before purchase.
Return shipping costs are the buyer's responsibility. Contact support to start a return.
Questions? Our Support Team is here to help before and after your purchase.
30 Days
Returns
Replaceable
Battery
12 Month
Warranty
Choose options
in the box
Your guide to a perfect first night. Use this to access our comprehensive online resources, where you'll find step-by-step setup videos, placement tips, and a direct line to our support team to ensure you're tracking your BBT with confidence, from day one.
Our signature armband is crafted from a soft, breathable fabric designed for ultimate comfort while you sleep. The included extender ensures an adjustable and secure fit for arms of all sizes, allowing the sensor to stay correctly positioned for accurate data without feeling restrictive. Available in two sizes.
Powered by a standard coin-cell battery, Tempdrop eliminates daily charging with a long-lasting, user-replaceable coin-cell battery that is easily changed after 12 months, ensuring you consistently get the accurate data you need to track your fertility. The app alerts you when power is running low, so you can effortlessly replace the battery yourself at home, using the included tool.
The Tempdrop wearable sensor captures continuous temperature data throughout the night using our patented algorithm to filter out sleep disturbances. When you wake up, it syncs easily to your smartphone via Bluetooth, giving you an accurate daily status update with just one touch.
WHY TEMPDROP FEELS DIFFERENT
The data accuracy of a clinical BBT thermometer.
The effortless ease of a wearable.
Most methods get it half right: oral thermometers give you true BBT data but demand perfect routine and rigid schedules, while smart rings and watches offer comfort but only track peripheral skin trends. Tempdrop bridges the gap. It monitors your true resting temperature continuously overnight, delivering high-integrity data to your fertility chart automatically.
Some tracking methods depend on perfect routines, exact fit, or manual interpretation.
Tempdrop is designed for real-life fertility tracking - worn overnight, synced when convenient, and built around cycle insights.
Small disruptions create big data gaps
Finger placement introduces signal noise due to movement, temperature changes, and circulation shifts.
Smart rings require regular charging, which can interrupt consistent tracking.
Smart rings can often feel uncomfortable as fingers swell or shrink.
Strict waking routines create mental burden and human errors
Requires taking your temperature at the same time every morning.
Easily disrupted by irregular sleep, travel, shift work, or unpredictable routines.
Mouth-breathing, congestion, movement, or speaking can skew readings.
Built for wellness, not fertility-first tracking
Wrist-based temperature can easily be affected by changes in your sleep environment.
Frequent charging requirements mean a low battery can leave you with missing cycle data.
Not designed to reliably track, predict, or confirm ovulation, especially for long, irregular, or PCOS cycles.
A fertility tracking method designed around real life - not perfect routines.
See How It WorksWhy it's easier:
Sleep on your terms
Worn on the upper arm for more stable overnight tracking.
No 6 a.m. alarms. Track your temperature while you sleep naturally.
Sync when you’re ready
No charging required for consistent overnight tracking.
Your data is stored on the sensor. Check your results when it suits your routine.
Built for real sleep
No strict wake-up routine or first-thing temperature check required.
Designed to filter out disturbances like restless sleep, travel, or late nights.
Fertility-focused tech
Works with irregular sleep, travel, shift work, and unpredictable routines.
A dedicated sensor built for BBT, not a general-purpose fitness tracker.
Clearer insights
The smartphone app confirms ovulation for you so you don't have to guess.
The smartphone app confirms ovulation for you so you don't have to guess.
Supports long, irregular, and PCOS cycles.
Designed specifically for fertility and cycle tracking.
Built to make fertility tracking feel more consistent and less stressful.
See How It WorksIncluded with purchase
Free fertility essentials, deeper
insights with premium.
Every Tempdrop works with the free app right out of the box. your purchase includes 2 months access to Premium features for free.
Every Tempdrop works with the free app right out of the box. Your purchase includes 2 months of Premium free - no credit card required.
Tempdrop brings the full fertility tracking solution to your smartphone.
Unlock deeper insights with advanced cycle analysis, sleep quality data, and expert fertility education.
All Free features +
Get the app
Available on iOS and Android
| Feature | Free | Premium |
|---|---|---|
| 60 Hour Data Storage | ||
| Daily Temperature Results | ||
| Manual Symptom & Period Logging | ||
| Fertility Chart View | ||
| Data Export & Share | ||
| Cycle History | ||
| Wear/Sync Reminders | ||
| Full Data Protection | ||
| Apple / Google Health Integration | ||
| Chart Interpretation | ||
| Automated Ovulation Confirmation | ||
| Fertile Window Indicator | ||
| Enhanced Calendar View | ||
| Intelligent Cycle Forecasts | ||
| Advanced Sleep Quality Tracking | ||
| Exclusive Educational Programs |
How It Works
Before you go to sleep, press the drop-shaped button to turn on your Tempdrop sensor. Place the band on your upper arm and leave it on throughout the night.
Remove once you are up for the day and sync with the Tempdrop app whenever convenient.
Track your symptoms to verify ovulation and learn about your cycle phases.
View the chart and interpret your results. Upgrade to premium for automatic interpretation.
Community
4.8
1,017+ reviews
I have endometriosis, PMDD and ADHD and Tempdrop has completely changed my life. No more having to remember to temp when I'm half asleep in the morning, it takes out all the guesswork. I use Tempdrop, along with my fertility awareness method, to confirm ovulation. I love how I can see when I ovulate, when my PMDD shift is coming and even when an endo flare is likely. I feel prepared, informed and in so much more control than I before
After a year of TTC, I was finally able to conceive naturally on my first confirmed ovulation cycle using Tempdrop. Tempdrop was simple, practical, and fit seamlessly into my routine. Paired with ovulation strip testing, Tempdrop made the process feel much more manageable and gave me so much more confidence in understanding my cycle and understanding my body. After months of negative tests and uncertainty, finally seeing that positive was such an emotional moment.
I've been taking my temperature every morning for over a decade. But then I had a baby. Co-sleeping, nursing, and waking up at all hours... suddenly those slow, consistent mornings just weren't accessible anymore. That's when Tempdrop became my new best friend. The set-it-and-forget-it tracking has been a game changer. I can confirm ovulation, count my luteal phase, avoid surprise periods, even with my morning routine out the window. For anyone in a postpartum (or just busy) season of life... this makes tracking temp actually doable.
My husband and I were losing hope after going through 2 rounds of IVF and 2 failed embryo transfers. We were told our chances were close to zero at my age, so we cancelled the next round and decided to continue with natural conception. I wanted to monitor my BBT, but I didn't like checking it with a thermometer, so I liked that Tempdrop is worn on the outside of the body. I was able to confirm ovulation when my BBT started to rise and stayed above the cover line, and 2 weeks later we saw those 2 little lines. Today he's 5.5 months, and he's a lovely baby boy 💙 We are so lucky and happy!
Tempdrop has truly made BBT tracking so convenient and has given me peace of mind, especially when it came to me starting my journey to learn a fertility awareness method to prevent pregnancy naturally. I knew I never wanted to go on hormonal birth control, but I didn't know what other options I had. After hearing about fertility awareness methods and Tempdrop, I was all in. It is truly wonderful and fulfilling to know what is going on in your body on a day-to-day basis.
After struggling with irregular periods and the daily stress of traditional BBT thermometers making me feel like I was chained to my nightstand each morning, and ovulation strips giving me false positives, I knew I needed a better way to track ovulation. So when we were ready to try for our next baby, I knew I needed something easier and more informational. Tempdrop was recommended to me and now I love being able to turn off my brain about my cycle but I also really like the option of logging cervical mucus, mood and disturbances to see trends. As a doula, I now recommend Tempdrop to all my clients.
I began using Tempdrop for baby #2, as I wanted to conceive quickly. Paired with ovulation strips, Tempdrop helped me learn I had a short luteal phase affecting implantation. The weekend I got pregnant, my ovulation tests never showed positive, but my Tempdrop showed a temperature spike! Sharing this BBT data with my practitioner meant treatment to aid implantation. I would have assumed I wasn't ovulating without Tempdrop. It was an amazing resource to share with doctors—I recommend it to everyone!
I just wanted to say thank you to the Tempdrop group, the creators of the device and those who gave me feedback and advice on charts. I purchased my device with suspected non-ovulatory cycles, which Tempdrop helped confirm. It took further help to fall pregnant (and a good few years in between), however, having my charts and data handy to give to my doctors made it easy to prove my cycles were “wonky” and to begin the process of fertility treatments. Now I have a beautiful 3-week-old baby girl, and I owe some gratitude to this device for starting me on my journey to her.
I just want to say a big thank you to Tempdrop and the team! I have PCOS and it took me over 2.5 years to conceive my son. I only ovulate a few times a year and prior to Tempdrop I was completely unaware of that and taking pregnancy tests every single month. Thanks to Tempdrop, I knew when I could expect my period and it kept me from taking negative tests every month!
why tempdrop?
See how Tempdrop stacks up against the alternatives.
| Feature | TEMPDROP | OTHER WERABLES | Oral Temping |
|---|---|---|---|
| Tracks True BBT | |||
| No Charging Required | |||
| Wake Up Whenever You Want | |||
| Fits Irregular Cycles & PCOS | |||
| Accurate Fertile Window Detection | |||
| Filters Sleep Interruptions & Movement | |||
| Comprehensive Fertility App Included | |||
| Full Data Control | |||
| Accurate Through Sickness or Travel | |||
| Pairs With Other Fertility Apps |
FAQ
Tempdrop is a wearable fertility monitor that measures your basal body temperature (BBT) while you sleep - no alarm, no schedule, no invalid readings. Along with its fertility tracking app, Tempdrop automates the data collection required for accurate cycle tracking, providing the confidence you need to manage your reproductive health without the stress of manual temping.
A traditional Basal Body Temperature (BBT) thermometer requires a strict routine to be accurate: you must take your temperature orally as soon as you wake up, at the same time every morning, after at least 3–4 hours of uninterrupted sleep.
Tempdrop removes these lifestyle barriers. Unlike a manual thermometer, Tempdrop uses continuous overnight tracking and a patented algorithm to identify your true basal body temperature. By monitoring your BBT throughout the night, it filters out disturbances like restless sleep, late nights, or waking up at different times.
With Tempdrop, you get a reliable reading that fits your life, not the other way around.
Most popular wearables are designed for general fitness, tracking metrics like heart rate and daily steps. While some now include temperature sensors, they typically measure skin temperature patterns rather than true Basal Body Temperature (BBT).
Tempdrop is a dedicated fertility tool. We don’t track heart rate or activity because we focus 100% of our technology on capturing your core resting temperature with medical-grade precision. This focus allows Tempdrop to provide the high-resolution BBT readings required for Fertility Awareness Methods (FAM)—accuracy that general-purpose trackers often cannot reach.
Our precision is backed by science: recent clinical research confirms that Tempdrop’s patented technology provides 98.6% accuracy for fertile window detection, making it a reliable partner for your reproductive health goals.
Our precision is backed by science: recent clinical research confirms that Tempdrop’s patented technology provides 98.6% accuracy for fertile days detection and 93.3% accuracy for confirming ovulation.
Tempdrop is unique because it's a wearable that gives you freedom and options to suit your specific needs. The Tempdrop app has both free and premium versions.
Tempdrop Premium is an optional in-app subscription upgrade that transforms your daily temperature readings into actionable fertility insights through automated chart analysis and cycle tracking tools.
The Premium subscription provides advanced automatic cycle interpretations, including:
The Tempdrop battery typically lasts 10 to 14 months with regular nightly use.
Because it is powered by a standard CR2032 coin cell battery, you never have to worry about plugging it in or daily charging.
Easy to Replace: You can quickly swap the battery yourself at home using standard, easily accessible coin cells.
Low Battery Alerts: The Tempdrop app will notify you in advance when power is running low, ensuring you never miss a night of tracking.
Yes, you can use Tempdrop postpartum. Its wearable sensor is designed to filter out disruptions from broken sleep, making it an effective tool for tracking fertility while breastfeeding or experiencing irregular postpartum cycles. Because Tempdrop does not rely on predictions, it adapts to your body in real time. It works best for postpartum moms when it is used along with tracking other body signs, such as cervical mucus or hormonal markers.
Tempdrop is designed for flexibility, so you don’t need a fixed wake-up time.
General guidelines:
Turn it on before sleep and remove it once you’re fully awake.
Yes, Tempdrop is entirely safe for overnight wear, including during pregnancy and postpartum.
Designed specifically for safe sleep tracking, Tempdrop operates with zero active radiation or Bluetooth transmission while you sleep. The sensor is powered by a standard, low-voltage coin cell battery (rather than a rechargeable lithium-ion battery), meaning it generates no heat.
The Bluetooth Low Energy (BLE) function only turns on for about 30 seconds when you actively choose to sync your data. It is manufactured with medical-grade, skin-safe materials and is fully FCC and CE compliant.
12-month satisfaction guarantee
Upgrade by adding 'VIP Care Package' before purchase to add a 12-month satisfaction refund guarantee to your Tempdrop.
30-Day Change of Mind
Unopened Tempdrops may be returned within 30 days. Contact our team to initiate a return.
Yes—Tempdrop was specifically designed to handle the irregular sleep patterns that make traditional tracking impossible.
A traditional BBT thermometer requires you to wake at the same time every day after at least 3–4 hours of consecutive sleep. For shift workers, on-call professionals, or new parents, these requirements are often impossible to meet.
Tempdrop removes these barriers by monitoring your temperature continuously throughout the night (or day). Our patented algorithm filters out disturbances caused by changing sleep times, bathroom trips, or waking up to a pager. As long as you wear the sensor for at least three hours and get a minimum of two hours of sleep (even if not consecutive), Tempdrop will provide a valid, accurate BBT reading.
At Tempdrop, we treat your health data with the highest level of security and respect. We do not sell your personal information to third parties, and all sensitive health data is used exclusively to provide your cycle insights or, with your explicit consent, for de-identified research to advance women's health. We operate under strict data protection principles (including GDPR compliance), ensuring that your identity and your biological data remain private and under your control. You can read our full data privacy policy here.
We understand the concerns regarding reproductive privacy, and we are committed to protecting our users. To give you ultimate control, we have built a permanent account deletion feature directly into the app. If your Tempdrop journey comes to an end and you choose to delete your account, all your personal and health data is scrubbed from our servers, leaving nothing to be retrieved or reported. We believe that your body’s data belongs to you, and we provide the tools to ensure it stays that way.
Still have questions? Contact Support
