The best period tracker apps, compared
Most period trackers log a period. Where they differ is what they charge for, what they do with your data, and whether they keep up once your cycles start to change in your 40s. This page puts seven of them in one table, with a source for every line.
Her Good Days is the pick: every feature is free, with no paid tier, and it covers periods, fertile-day estimates, pregnancy, perimenopause and menopause in one app, with a doctor report and Private mode.
Apple Health is the free option if you only need cycles on an iPhone. Flo and Clue keep their deeper insights behind a subscription. Natural Cycles is the one to pick for FDA-cleared birth control, at $149.99 a year.
Side by side
Swipe the table sideways to see every column.
| App | Price, US (checked Oct 30, 2026) | What is paid | Data practices | Menopause | Age rating, teen mode | Platforms |
|---|---|---|---|---|---|---|
| Her Good Days | Free, no paid plan | Nothing. An optional shop sells wellness products | No data sales and no third-party ads; adults see the app's own promo cards. Private mode: no account, nothing leaves the phone, logs in an encrypted database | Hot flashes, night sweats, brain fog with severity, medication reminders, doctor report PDF | 13+; teen mode for 13 to 17 | iPhone, Android |
| Flo | Free tier; in-app purchases from $1.99 to $59.99 | Premium: personal insights, Symptom Checker, Health Assistant, deeper pregnancy features | Says it has never sold user data. App Store label lists purchases, location, identifiers and usage data as used to track you. FTC order in 2021 | Perimenopause Score, Menopause Timeline | 13+ | iPhone, Apple Watch, Android |
| Clue | Free tier; Clue Plus $9.99 a month or $39.99 a year | Clue Plus: deeper analysis, advanced predictions | Policy says health data is never shared with or sold to advertisers. Label lists identifiers as used to track you | Perimenopause mode | 13+ | iPhone, Android |
| Natural Cycles | $21.99 a month or $149.99 a year | Core features need a plan | Optional Go Anonymous mode. Google Play: no data shared with third parties | NC° Perimenopause, temperature based | 16+ | iPhone, Apple Watch, Android |
| Stardust | Free tier; $6.99 a month or $29.99 a year | Not itemised in the listing | Label lists purchases, identifiers and usage data as used to track you. Dropped an end-to-end encryption claim in 2022 | Not in the listing | 13+ | iPhone, Android |
| drip | Free, open source | Nothing | App Store label: data not collected. Data stays on the device | Not on its site | 13+ | iPhone, Android, F-Droid |
| Apple Health | Free with an iPhone | Nothing | Encrypted on a locked iPhone; end to end in iCloud with two-factor authentication | Perimenopause and menopause stages, symptom log, irregular-cycle alerts from 40 | No teen mode described | iPhone, iPad, Apple Watch |
Prices and labels come from each app's US App Store listing unless the row links elsewhere. Sources are in each app's section below.
Her Good Days
Her Good Days is a free app for periods, pregnancy, perimenopause and menopause, with sleep, food and mood logs in the same place. There is no subscription; an optional shop pays for it. It runs on iPhone and Android, and brings in your steps from Apple Health or Health Connect if you allow it.
- Your next period shown as a range, with symptoms, sleep and medication logged on the same days
- Your medications and supplements, ticked each day, with reminders
- A weekly summary, and a doctor report for the dates you pick, as a PDF
- Workout programs led by our trainers, Sarah and Elena
Fertile days are shown as estimates, labeled "Not birth control", and never in teen mode.
It's built for women whose cycles are starting to change. See periods and perimenopause for what it tracks, and how it compares with Flo, Clue and Stardust.
Flo
Flo is the biggest name here, with about 2 million ratings on the App Store. The free app covers period and symptom tracking; Premium adds personal insights, a Symptom Checker, a 24/7 Health Assistant and deeper pregnancy tools. The listing shows a long row of prices without saying which plan each belongs to.
On privacy, Flo has two things worth knowing. In 2021 the FTC finalized an order after alleging Flo shared users' health data with marketing and analytics firms, including Facebook and Google. Since then it has added an Anonymous Mode that stores no name or email with your data, and its privacy FAQ says it has never sold user data.
Fits if you want fertility insights and pay for Premium. Her Good Days vs Flo.
Clue
Clue is based in Berlin and leans on European privacy law. Its privacy policy says tracked health data is never shared with or sold to advertisers. If you switch it on in settings, it does share events such as installing the app with ad networks like Meta and TikTok. Modes cover periods, trying to conceive, pregnancy and perimenopause, and you can switch between them (App Store).
Fits if you track with a wearable. Her Good Days vs Clue.
Natural Cycles
- FDA-cleared birth control based on your temperature, from a thermometer, the NC° Band, Oura, WHOOP, Garmin or a recent Apple Watch
- $21.99 a month or $149.99 a year, with no free tier for core features (App Store)
- A perimenopause mode that tracks temperature and symptoms through to postmenopause
- Go Anonymous separates your identity from your cycle data (NC° Secure)
Fits if you want an app as contraception and will take a reading every morning. Her Good Days vs Natural Cycles.
Stardust
Stardust pairs tracking with astrology and moon phases, and has pregnancy and postpartum modes. Its App Store label says health data isn't linked to you, while purchases, identifiers and usage data are used to track you. In 2022 TechCrunch reported that the company removed an end-to-end encryption claim from its policy. Her Good Days vs Stardust.
drip
A small open-source app from a non-profit collective. Everything stays on your phone, with no account, and its App Store label reads "Data Not Collected". It tracks bleeding, mood, pain and temperature, and can estimate fertility with the symptothermal method (dripapp.org). You can export and password-protect your data.
Fits if you want the plainest tracker with nothing leaving the phone. It has no insights or articles.
Apple Health Cycle Tracking
Already on every iPhone. You can log periods, symptoms, spotting and temperature, get period predictions, and export a PDF of the last 12 months for a doctor. From 40, it can alert you to irregular or infrequent cycles, and you can set a perimenopause or menopause stage (Apple support). With two-factor authentication, cycle data in iCloud is end-to-end encrypted.
Fits if you only need cycles on an iPhone. There is no Android version, and no food or workout features in Cycle Tracking.
How we compared
Checked on October 30, 2026. We read each app's US App Store listing (price, in-app purchases, privacy label, age rating), its Google Play listing for Android availability, and the company's own privacy pages. We didn't install the apps or use paid plans, so what sits behind each paywall is as the listings describe it.
Store privacy labels are filled in by the developer and aren't checked by Apple. We'll update this page every 90 days, or sooner when a price or policy changes.
Questions
Which period tracker is completely free?
Her Good Days: every feature, with no paid plan, on iPhone and Android. Apple Health's Cycle Tracking is free on iPhone, and drip is a free open-source app. Flo, Clue and Stardust charge for their extras, and Natural Cycles needs a subscription.
Which period tracker doesn't sell your data?
Flo, Clue and Her Good Days all state in their own policies that they do not sell health data. Selling is only one question, though: the App Store privacy labels also show which data an app uses to track you across other companies' apps. drip's label says it collects no data at all.
Can a period tracker app be used as birth control?
Only one app here is FDA-cleared for that: Natural Cycles, which needs daily temperature readings. Apple says its Cycle Tracking should not be used as birth control, and Her Good Days shows fertile days only as estimates, labeled Not birth control.
Is there a period tracker that keeps data on my phone?
drip keeps everything on the device. Apple Health encrypts cycle data on the iPhone, and end to end in iCloud with two-factor authentication. Her Good Days has Private mode: no account, and nothing leaves the phone.
Start with today
Her Good Days is free, with no third-party ads and nothing to subscribe to. Free on iPhone and Android.