Hormonal fluctuations affect sleep quality, energy levels, and recovery capacity throughout the menstrual cycle. For women who train, understanding where they are in their cycle can inform decisions about workout intensity, rest days, and competition timing.
How we choose
This roundup highlights eight devices that capture basal body temperature, hormone levels, or recovery metrics to provide that context. Options range from overnight wearables and smart rings to Bluetooth thermometers and urine-based hormone monitors, at prices from $19.99 to $665.27.
Our 8 Picks
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Tempdrop Wearable Fertility Monitor for Women Ovulation Tracker BBT | Basal Body Temperature Monitor to Help Get Pregnant – Sleep Sensor with App for Fertility, Hormone, Period, Cycle Tracking
What it is
A wearable arm sensor that records basal body temperature overnight and syncs with an app to track fertility, cycle and period data.
Why it's worth it
The sensor is worn on the upper arm overnight, so you do not have to wake up to take an early-morning temperature reading. The brand states the companion app learns your nightly temperature rhythms and identifies the fertile window, which suits women with irregular cycles who train and want more cycle context. It also means temperature data is captured on nights when sleep is disrupted, without adding an extra step to your morning routine.
Caveat
It is a fertility tracker, not a sports watch, so it will not give you workout-specific recovery scores.
femometer Smart Basal Body Thermometer for Ovulation | High Accuracy, Backlight LCD Screen, Fertility/Period Tracker with Femometer APP, Automatic Data Recording, Waterproof
What it is
A Bluetooth basal body thermometer with a backlit screen that syncs temperature readings to the Femometer app for cycle and ovulation tracking.
Why it's worth it
Unlike a wearable sensor, this thermometer is a small Bluetooth stick you use only at the moment of measurement, which is a good fit for women who do not want to sleep in an armband or ring. The brand says it pairs with the Femometer app through Bluetooth, records readings automatically, and calculates an ovulation estimate from the resulting BBT curve. A backlit screen and lipstick-style body make it easy to use in a dark bedroom without turning on a light.
Caveat
It provides temperature and app data but no heart-rate or sleep-stage tracking.
Mira Fertility Plus Tracking Monitor Kit, LH & E3G, 10 Wands
What it is
A fertility monitor kit that measures LH and E3G from urine wands and uses the Mira app to display hormone patterns and fertile days.
Why it's worth it
Because it measures two hormones, LH and E3G, it gives a broader view of the fertile window than an LH-only strip. The brand cites up to 99.5% accuracy in hormone detection and says the app provides personalized, AI-powered cycle insights. It is well suited to athletes who want more detailed hormone data at home before scheduling training around cycle phase.
Caveat
The kit includes 10 test wands, and continued use requires additional Mira wands.
Daysy Fertility Tracker | Natural Hormone-Free, Ovulation Monitor & Fertility Awareness Device, Smart BBT Thermometer with App, Cycle Tracking
What it is
A basal temperature fertility tracker that measures BBT and uses red and green lights to show fertile and non-fertile days, with an accompanying app.
Why it's worth it
Daysy interprets basal temperature on the device itself, so you do not need to open an app or read a chart to know your status. The brand states the algorithm is 99.4% accurate and is designed for natural family planning, which suits athletes who want clear cycle-phase information without wearing a sensor. Its app tracks additional cycle data over time, and the device is rechargeable.
Caveat
It is a fertility-awareness device and does not measure heart rate, sleep stages, or recovery.
Clearblue Advanced Digital Ovulation Test Kit, 16 Count
What it is
A digital ovulation test kit that measures LH and estrogen in urine and displays high or peak fertility days on a digital screen.
Why it's worth it
This is a urine test that measures two hormones, LH and estrogen, and translates the result into High or Peak fertility days using a digital screen, removing the guesswork of reading test-line intensity. The brand states it is over 99% accurate at detecting the LH surge. It is a good fit for athletes who want a clear signal of the fertile window before deciding how to schedule harder training sessions.
Caveat
It provides information only for the day tested and does not log continuous temperature, sleep, or recovery data.
OURA Ring Gen3 Horizon - Gold - Size 6 | Size First with Oura Ring Gen3 Sizing Kit - Sleep Tracking Wearable - Heart Rate - Fitness Tracker - 5-7 Days Battery Life
What it is
A smart ring that tracks sleep, heart rate, activity and stress, with a Gen3 sizing kit included.
Why it's worth it
The ring form puts the sensors on the finger, which the brand says gives more accurate pulse readings than a wrist-worn device, and the stated 5-7 day battery life lets it stay on through a training week. It is a good fit for athletes who want sleep and recovery data without a visible screen or strap. The included Gen3 sizing kit helps confirm the correct ring size before you wear it.
Caveat
An Oura Membership is required after the included first month, which adds a monthly cost.
Garmin Lily® 2, Small & Stylish Smartwatch, 35mm, Coconut | Small & Stylish Design, Built-In GPS, Body Battery™, Sleep Score, Fitness Tracking & Sports Apps, Garmin Pay™
What it is
A small smartwatch with a hidden touchscreen display that tracks sleep, heart rate, Body Battery, menstrual cycle, and activity, plus connected GPS.
Why it's worth it
The Lily 2 includes menstrual cycle and pregnancy tracking, sleep score, respiration tracking, and Body Battery energy monitoring in a small case with a patterned lens that hides the display until tapped. It suits women who want cycle phase and recovery data on a watch that looks more like jewelry than a sports computer. The 35mm coconut colorway keeps the watch light on the wrist while still providing smart notifications.
Caveat
The standard Lily 2 relies on a connected phone for GPS rather than built-in satellite tracking.
Natural Cycles NC° Band - Plan Pregnancy with 1-Year App Subscription | Personalized fertility guidance •Pregnancy planning support •1-year app subscription •Temperature tracking •Sleep insights
What it is
A wearable band that measures overnight temperature trends and syncs with the Natural Cycles app to identify fertile days.
Why it's worth it
This bundle combines the NC° Band with a one-year Natural Cycles app subscription, so the algorithm interprets the overnight temperature data instead of leaving you to chart it manually. The brand states the system analyzes temperature trends and cycle data to identify fertile days, and the band also feeds in sleep insights. It is a good fit for women who want an app-led fertility tracker with no oral thermometer routine.
Caveat
It is designed to work with the Natural Cycles app, so the band is not a standalone tracker.
How to choose
How to choose the right cycle-tracking wearables and basal thermometers for training with your hormones
Takeaway
The right cycle-tracking device depends on whether you need prediction, confirmation, or full recovery context—and whether you prefer a morning ritual, overnight wearable, or test-based approach. Match the format to your consistency, budget, and training data needs, and the device becomes a practical training tool rather than another obligation.
