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Directory guide · Last checked October 15, 2026

Ovulation trackers, apps and the tests beside them.

Checked October 15, 2026 on each company's own site. Apps that estimate a fertile window are listed next to LH strips and a wearable thermometer. Nothing here is scored.

How we chose

What had to be on the company's own site.

The list is the ovulation tools already in this directory whose official pages say what is measured, whether a hormone is involved, whether an app or subscription is required, and how the product is priced. Natural Cycles, Flo, Clue, and Glow are apps. Premom is the free app plus the LH strips on its shop. Clearblue's Advanced Digital Ovulation Test is the stick test, not the touch-screen monitor. Tempdrop is the wearable. A dollar amount appears only when that page printed one.

Editorial disclosure

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Prices are what the linked page showed on October 15, 2026. A sale price can disappear the next day.

Ovulation trackers, apps and the tests beside them.. Facts from official sites, checked October 15, 2026.
Product	Measures	Hormones	App or subscription	Price on October 15, 2026
Natural Cycles	Daily temperature, including overnight with the NC° Band or a compatible wearable. The app labels fertile and non-fertile days.	It does not describe a urine hormone test. It uses temperature as the biomarker.	The app requires a subscription. Getting started means buying the subscription and a measuring device, then using the app.	The homepage describes annual and monthly plans and does not print a dollar price.
Flo	A cycle app. Flo says the free account includes period and ovulation tracking, and that you can log basal body temperature in the app.	Flo does not describe a hormone sensor. Estimates come from what you log.	The app is the product. A basic account is free. Flo Premium is an optional monthly or yearly subscription.	The Flo Premium page describes monthly and yearly plans and does not print a dollar price.
Clue	A cycle app Clue describes for understanding periods and ovulation from what you track.	The pages checked do not describe a hormone sensor.	Free to download on iOS and Android. Clue Plus is an optional subscription for extra analysis, including charts and cycle sharing.	The Clue Plus page does not list a dollar price.
Glow ovulation tracking	The ovulation app logs basal body temperature and LH test results, plus cycle symptoms. Glow also sells a basal thermometer that can send readings to the app.	You can log an LH test. The app itself is not a urine analyzer.	The app is free to start. Glow Premium is an optional subscription across Glow's apps.	Glow Premium was listed at $59.99 a year, $29.99 every three months, or $99.99 once.
Premom app and ovulation strips	A free app for period and ovulation tracking, plus urine ovulation tests you can photograph.	The shop sells quantitative LH strips. A separate Easy@Home pack adds PdG urine tests.	Premom calls the iOS and Android app free. Test kits and a premium membership cost extra. The membership page does not print a dollar price.	Quantitative LH strips were listed at $14.99. Easy@Home strips with cups were listed from $14.99 to $29.99.
Clearblue Advanced Digital Ovulation Test	A digital ovulation test that reads a urine stick and shows a result on the holder. This is a different product from the touch-screen Fertility Monitor.	LH and estrogen. Clearblue contrasts it with tests that detect LH only.	The test shows its result on the holder. Clearblue's separate cycle-tracker app is free and is not described as required for this test.	The test page did not list a shelf price. Clearblue sells the kits in stores.
Tempdrop wearable	An armband sensor records skin temperature overnight and syncs a basal-temperature reading to the app.	No urine hormone. Temperature is the signal.	The sensor needs the Tempdrop app. Basic charting is described as free. Premium is optional.	Tempdrop 2.0 was listed at $189 on sale, with $214 and $225 also shown on the page.

Natural Cycles

Measures: Daily temperature, including overnight with the NC° Band or a compatible wearable. The app labels fertile and non-fertile days.
Hormones: It does not describe a urine hormone test. It uses temperature as the biomarker.
App or subscription: The app requires a subscription. Getting started means buying the subscription and a measuring device, then using the app.
Price: The homepage describes annual and monthly plans and does not print a dollar price.

Natural Cycles says you must be over 18, that it does not protect against STIs, and that it is 93% effective with typical use and 98% effective with perfect use.

Official site Directory listing for Natural Cycles

Flo

Measures: A cycle app. Flo says the free account includes period and ovulation tracking, and that you can log basal body temperature in the app.
Hormones: Flo does not describe a hormone sensor. Estimates come from what you log.
App or subscription: The app is the product. A basic account is free. Flo Premium is an optional monthly or yearly subscription.
Price: The Flo Premium page describes monthly and yearly plans and does not print a dollar price.

Official site Directory listing for Flo

Clue

Measures: A cycle app Clue describes for understanding periods and ovulation from what you track.
Hormones: The pages checked do not describe a hormone sensor.
App or subscription: Free to download on iOS and Android. Clue Plus is an optional subscription for extra analysis, including charts and cycle sharing.
Price: The Clue Plus page does not list a dollar price.

Official site Directory listing for Clue

Glow ovulation tracking

Measures: The ovulation app logs basal body temperature and LH test results, plus cycle symptoms. Glow also sells a basal thermometer that can send readings to the app.
Hormones: You can log an LH test. The app itself is not a urine analyzer.
App or subscription: The app is free to start. Glow Premium is an optional subscription across Glow's apps.
Price: Glow Premium was listed at $59.99 a year, $29.99 every three months, or $99.99 once.

Official site Directory listing for Glow

Premom app and ovulation strips

Measures: A free app for period and ovulation tracking, plus urine ovulation tests you can photograph.
Hormones: The shop sells quantitative LH strips. A separate Easy@Home pack adds PdG urine tests.
App or subscription: Premom calls the iOS and Android app free. Test kits and a premium membership cost extra. The membership page does not print a dollar price.
Price: Quantitative LH strips were listed at $14.99. Easy@Home strips with cups were listed from $14.99 to $29.99.

Official site Directory listing for Premom

Clearblue Advanced Digital Ovulation Test

Measures: A digital ovulation test that reads a urine stick and shows a result on the holder. This is a different product from the touch-screen Fertility Monitor.
Hormones: LH and estrogen. Clearblue contrasts it with tests that detect LH only.
App or subscription: The test shows its result on the holder. Clearblue's separate cycle-tracker app is free and is not described as required for this test.
Price: The test page did not list a shelf price. Clearblue sells the kits in stores.

Official site Directory listing for Clearblue

Tempdrop wearable

Measures: An armband sensor records skin temperature overnight and syncs a basal-temperature reading to the app.
Hormones: No urine hormone. Temperature is the signal.
App or subscription: The sensor needs the Tempdrop app. Basic charting is described as free. Premium is optional.
Price: Tempdrop 2.0 was listed at $189 on sale, with $214 and $225 also shown on the page.

Official site Directory listing for Tempdrop

Questions these pages can answer.

Is Natural Cycles birth control?

Natural Cycles says it is an FDA-cleared birth control app. The company says you must be over 18, that it does not protect against STIs, and that it is 93% effective with typical use and 98% effective with perfect use.

Do period apps measure hormones?

Flo, Clue, and Glow describe logging and cycle estimates. They do not describe a urine hormone sensor. Glow says you can log LH tests and basal temperature. Premom's tracking app is free, and the company also sells LH strips. A line on a strip is that test's result, not a diagnosis.

Which of these require a subscription?

Natural Cycles requires a subscription. Flo says a basic account is free and Flo Premium is optional. Clue Plus and Glow Premium are optional paid subscriptions. Premom calls its tracking app free and sells strips and a membership separately. Tempdrop says the basic chart is free and Premium is optional. The sensor itself is a purchase.

Keep going

Fertility monitorsUrine hormone readers and a wearable.PCOS appsWhat those companies say the app covers.All toolsThe full directory, with the same official links.