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.

The Tempdrop sensor is made from medical-grade ABS plastic and stainless steel (which contains trace amounts of nickel).

Armbands are made from polyester, spandex, nylon, and silicon.

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.

No. Tempdrop is designed specifically for safe sleep tracking. Tempdrop operates with zero active radiation or Bluetooth transmission while you sleep.

The Bluetooth Low Energy (BLE) function only turns on for about 30 seconds when you actively choose to sync your data.

Thanks to continuous axillary temperature and accelerometer measurements, Tempdrop collects and analyzes thousands of data points
throughout the night. Using all this raw data, the algorithm filters out when you woke up to feed your baby, or had trouble getting to sleep, and even just your standard tossing and turning. Throughout all of it, Tempdrop looks for when you are most restful and uses the temperature at that time.

No. Tempdrop doesn't take an average; it analyzes thousands of data points to identify your lowest body temperature (BBT) at rest.

Yes—Tempdrop was specifically designed to handle the irregular sleep patterns that make traditional tracking impossible.

A traditional BBT thermometer typically 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.

Yes. By capturing continuous overnight resting temperatures rather than single waking points, Tempdrop reliably identifies temperature shifts and confirms ovulation even with variable cycle lengths.

Tempdrop can be used with most fertility awareness apps by manually entering results.

Tempdrop automatically integrates with the following apps:

• Apple: Chart Neo, Read Your Body, Apple Health.
• Android: OvuView,Chart Neo, Read Your Body, Health Connect.

Wear the sensor inside the fabric armband on your upper arm, close to your armpit. The sensor should be positioned directly over the axillary artery (the soft skin between your bicep and tricep muscles). Instructions for specific wearing and use are available in the Tempdrop app.