Track your cycle while you sleep.

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:

• Chart Interpretation
• Automated Ovulation Confirmation
• Fertile Window Indicator
• Enhanced Calendar View
• Intelligent Cycle Forecasts
• Advanced Sleep Quality Tracking
• Exclusive Educational Programs

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:

• Wear Tempdrop for at least 3 hours
• Aim for at least 2 hours of detected sleep (not necessarily consecutive)

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.

Read the full refund T&Cs here.

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.