Lady-Comp Ovulation Tracker

Track your cycle without an app and stay completely offline.
No subscription, no test strips, no hormones.

40+

Since 1986

40 years of research
99,4%

Accuracy

Scientifically proven
No extra costs

Works fully offline

No subscription, no test stripes
Lifetime product

2-year warranty

Your cycle always in view

WHO THIS IS FOR

Got a period? You can use Lady-Comp.

Lady-Comp is an ovulation tracker by Valley Electronics. It measures your basal body temperature (BBT) and identifies your fertile and non-fertile days, completely without an app and offline. Designed and made in Germany for over 40 years. It works for:

Menstrual cycle between 19 and 40 days

Irregular periods

Irregular sleep schedule

Shift workers

Postpartum mothers

Busy or changing routines

You don’t have to live a certain type of lifestyle or avoid alcohol to use Lady-Comp to track your fertility.

The OG of ovulation trackers

Track your cycle without an app

Don’t like grabbing your phone first thing in the morning? No sweat. Lady-Comp has been around since long before the age of smartphones (40 years, to be exact) and tells you everything you need to know on one compact device.

No wifi or complex cycle charts needed!

Wow, so easy to use! The Lady-Comp has a bit more of a retro feel, but very user-friendly, no need to sync to an app. Definitely a great option if you want a stand-alone device.

Amazon review

This is a great device to either prevent pregnancy or get pregnant. Works great and super easy to use. It's very accurate and have been using it for a few months so far without any issues. Recommend it.

Maria, Amazon review

Best natural planning tool I’ve ever used!!! Despite the initial investment, its accuracy is amazing. After only a couple months, it now can tell me exactly when my period is coming, and my cycle is very irregular. I highly recommend this product!!!!”

laineh, Amazon review

HERE’S HOW IT WORKS

How does Lady-Comp work?

Got a minute? That’s all you need.

Simply take your basal body temperature each morning after waking up before getting out of bed to learn if you’re within your fertile window. In under 60 seconds.

Thanks to the backlit display, you can easily see your temperature and fertility status no matter how groggy you feel.

You can accurately use the fertility awareness method with Lady-Comp without tracking any other symptoms like cervical mucus.

More about the fertility-tracker-method

Everything in one compact ovulation tracking device

More than an ovulation tracker, Lady-Comp is your all-in-one device. Unlike Daysy, everything lives on the device itself: your daily fertility status, cycle calendar, statistics, a built-in alarm, and even pregnancy mode with your conception and due date. No phone, no app, nothing to sync.

Get your daily fertility status and see your ovulation day

See your temperature and fertility on the home screen.

Enter when you have your period and intercourse for accurate predictions – from day one.

Set an alarm

You’ll never forget to take your temp because you can set an alarm with Lady-Comp.

View your cycle calendar

Check your fertile and non-fertile days in the month and view past months.

Understand your temperature change

With the cycle curve display, you can see exactly how your temperature affects your fertility status.

See your cycle stats

Understand trends and forecasts with essential info like your average temperature measurements, cycle length, fertile window, and number of cycles tracked.

Track your pregnancy

See the date of conception, expected due date, and gestation week.

Why Lady-Comp?

Here’s why hundreds of thousands of women love
Lady-Comp Ovulation Tracker

She’s fast & easy

Other basal body thermometers can take up to 3 minutes to record your temperature. Lady-Comp just needs 60 seconds max to give you an accurate measurement.

She’s precise

Lady-Comp’s temperature sensor is highly sensitive and certified medical quality, so there’s no chance for measurement inaccuracies or rounding errors.

She’s durable

Her battery lasts for months, so you can bring Lady-Comp traveling to remote destinations without electricity. We’ve heard of women using Lady-Comp for 25+ years.

She’s all you need

As a standalone device, you don’t need to manually transfer your temperature into an app (and potentially make a mistake that could lead to an unplanned pregnancy or not conceiving as you hoped).

She doesn’t guess

Lady-Comp’s algorithm carefully considers your past average temperature to give you an accurate prediction of your fertile days. If there isn’t enough data to show your fertility status with certainty, she will display a yellow light.

She’s private

Your cycle data is stored on your device and only transmitted encrypted. We don't sell your data. Whether you share it with us, for example for a cycle analysis, is your choice.

SEE IF SOMETHING’S UP

Want kids now or later?

Lady-Comp can tell you:

If you’re ovulating
If you have regular cycles
If you’re fertile
If you have hormonal deficiencies (such as luteal phase defect)

Knowledge is power.

Understand your cycle to support your family planning goals. All the way until menopause.

Us vs. them

See how our ovulation trackers stack up

Lady-Comp	Daysy	Other period trackers
99.4% accurate	99.4% accurate	93% accurate
No app needed	Works without an app	Needs both a thermometer and app
One-time purchase, no hidden costs (payment plans available!)	One-time purchase, no hidden costs (payment plans available!)	$9.99+ monthly subscription
Works offline	Bluetooth only on demand	Needs wifi to display fertility status
Reliable algorithm that works with irregular cycles	Reliable algorithm that works with irregular cycles	Algorithm uses AI to fill in the gaps
AAA batteries	Long battery life	Needs phone charger
Backlit display	Lights up with fertility status	No backlit display
Sensitive sensor that measures to the hundredth of a degree	Sensitive sensor that measures to the hundredth of a degree	Sensor only measures to the tenth of a degree
Detects hormonal deficiencies	-	-
Shows expected delivery date	-	-

The science behind the accuracy

So many ways to save

FSA and HSA eligible

Get reimbursed for your device through your health insurance.

Payment plans available

Starting at just $20 per month or 0% APR with affirm.

Refer a friend to save

Got a friend who’d love this? You’ll each get a code to save.

In the Shop

Bundles & Accessories

Lady-Comp

Upgrade to the newest Lady-Comp

Mother & Daughter Bundle (Lady Comp & Teena)

FAQ

Lady-Comp works even with irregular periods, plus more answers to common questions

Do I have to measure at the same time every day?

No. But be sure to use Lady-Comp daily right after you wake up, before you get up and get active. For optimal use of Lady-Comp, we recommend that you have at least 1 hour of continuous sleep before measurement.

How long does it take to measure?

It will take approximately 60 seconds to measure.

I have to get up frequently during the night because I have a baby. Can I use Lady-Comp even with little sleep?

Yes, but be sure to use Lady-Comp (or Pearly) daily right after you wake up, before you get up and get active. For optimal use of Lady-Comp, we recommend that you have at least 1 hour of continuous sleep before measurement. If you don't get that during certain nights, there is no reason for concern. Lady-Comp (or Pearly) can handle skipped measurements from time to time.

When can I start using Lady-Comp?

You can immediately start with the measurements. If you were using hormonal birth control before, stop using it before you begin measuring. The first bleeding after coming off hormonal birth control is a withdrawal bleeding and must not be entered as your period. If you are menstruating when starting with Lady-Comp and you cannot enter all days, do not enter the current menstruation, but the next one. The first day of menstruation is important because it marks the beginning of your cycle.

When can I start to rely on Lady-Comp's results?

You can rely on Lady-Comp's results starting the very first day of use. In the beginning, you will see more yellow and red days because they Lady-Comp is still learning your unique cycle rhythms. You will see more green days as the device comes to understand your cycle and can narrow down your fertile window. The more regularly you measure, the better.

How accurate is Lady-Comp?

Lady-Comp determines your non-fertile (green) days with a scientifically confirmed accuracy of 99.4%. This was verified in a published study of 5,328 women and over 107,000 cycles from Germany and Switzerland. The algorithm behind it has been developed since 1986 and draws on over 10 million analyzed cycles. When there isn't enough data, Lady-Comp shows a yellow light instead of guessing.

Sources: Dessole, S., Fadda, M. C., Rosas, N., Scapinelli, A., Inaudi, P. & Ambrosini, A. (1997). Monitoring of ovulation by sophisticated digital electronic BBT recording "Baby-Comp" in patients with unexplained infertility. International Meeting on Infertility and Assisted Reproductive Technology, Porto Cervo, Sardinia, June 11–14, 1997, Program and Abstracts Book, p. 253. (Conference abstract) Freundl, G., Frank-Herrmann, P., Godehardt, E., Klemm, R. & Bachhofer, M. (1998). Retrospective Clinical Trial of Contraceptive Effectiveness of the Electronic Fertility Indicator Ladycomp/Babycomp. Advances in Contraception, 14(2), 97–108. DOI: 10.1023/A:1006534632583.

Binkiewicz, P., Michaluk, K. & Demiańczyk, A. (2010). Calculation of the Pearl Index of Lady-Comp, Baby-Comp and Pearly cycle computers used as a contraceptive method. Ginekologia Polska, 81(11).

Demiańczyk, A. & Michaluk, K. (2016). Evaluation of the effectiveness of selected natural fertility symptoms used for contraception: estimation of the Pearl index of Lady-Comp, Pearly and Daysy cycle computers based on 10 years of observation in the Polish market. Ginekologia Polska, 87(12), 793–797. DOI: 10.5603/GP.2016.0090.

van de Roemer, N., Haile, L. & Koch, M. C. (2021). The performance of a fertility tracking device. The European Journal of Contraception & Reproductive Health Care, 26(2), 111–118. DOI: 10.1080/13625187.2021.1871599.

See more FAQs

Product details, warnings and safety information

Information about the device

Size:

9 cm / 3,5 inch in diam

Weight:

130 g

Battery:

2 x AAA

EAN:

7629999894334

WEEE-Reg.-Nr.:

DE34917049