Company pages only
What each company states
Clue
- Job the company states
- A women-led period and cycle tracker for logging bleeding, symptoms, and cycle statistics. Clue's site describes support from a first period through perimenopause.
- Contraception claim
- Clue says it is not a contraceptive and not a diagnostic test. Clue does not describe a hormone sensor.
- Free tier
- The listing's Free tier line says Yes. Free to download. Clue Plus is optional. Clue's support article says the Clue Plus price varies by region and is shown in the app. That article does not print a dollar amount.
- Account and data
- Clue's homepage says you can create a free account. The privacy block says tracked health data is never shared with or sold to advertisers, and that Clue uses usage and device data to measure its own ads. The listing's Ads data line says No.
- Modes named
- The perimenopause page describes a mode to track changes, and names hot flashes, sleep changes, and cycle-length changes. That page does not say the mode requires Clue Plus.
- Price if printed
- Free to download. Clue Plus is optional. Clue's support article says the Clue Plus price varies by region and is shown in the app. That article does not print a dollar amount.
- Platforms
- iOS, Android
Flo
- Job the company states
- A cycle app Flo describes for periods, ovulation, pregnancy, and perimenopause. You log periods and symptoms. Estimates are product features, not a clinical reading.
- Contraception claim
- The listing does not describe Flo as birth control. Flo does not describe a hormone sensor. Estimates come from what you log.
- Free tier
- The listing's Free tier line says Limited. A basic account is free. Flo Premium is an optional monthly or yearly subscription. The Flo Premium page does not print a dollar price.
- Account and data
- Flo uses an account. The privacy block says Flo will never sell your data, and that Flo uses device IDs to measure its own ads. The listing's Ads data line says No.
- Modes named
- The homepage names periods, ovulation, pregnancy, and perimenopause, including support for perimenopause symptoms. The pregnancy page describes week-by-week information and a place to chat with other parents-to-be.
- Price if printed
- A basic account is free. Flo Premium is an optional monthly or yearly subscription. The Flo Premium page does not print a dollar price.
- Platforms
- iOS, Android
Natural Cycles
- Job the company states
- A subscription app the company describes as FDA-cleared birth control. It uses temperature to label fertile and non-fertile days. You also buy or use a measuring device, such as the NC° Band, another compatible wearable, or a thermometer.
- Contraception claim
- Natural Cycles says it is cleared by the FDA as birth control. The company says it is 18+ only, offers no STI protection, and is 93% effective with typical use and 98% effective with perfect use. Regulatory clearance is not a promise that the method will work for you.
- Free tier
- The listing's Free tier line says No. On October 15, 2026 the homepage described annual and monthly plans and did not print a dollar price. The perimenopause page does not print a separate price.
- Account and data
- A subscription is required. The privacy block says the company does not sell data, and that it matches scrambled contact and device data with social media sites to target ads. The listing's Ads data line says Yes.
- Modes named
- The site describes modes for planning pregnancy, following pregnancy, postpartum, and perimenopause. The perimenopause page describes a stage assessment using temperature from wearables. It does not describe a urine hormone test.
- Price if printed
- On October 15, 2026 the homepage described annual and monthly plans and did not print a dollar price. The perimenopause page does not print a separate price.
- Platforms
- iOS, Android, Thermometer or compatible wearable