Best period tracker for teens in 2026: a parent’s honest guide.

Most "best period tracker" articles online were written by the apps themselves, the apps’ affiliates, or sites that earn a commission when you download. Our daughter Mia and her mom Lau spent three months trying every popular tracker we could install. This guide is what we wish we’d found before we started.

We’ve tried to be fair. Each app on this list does something well, and the right tracker for your daughter depends on her age, what she wants to track, and how much you trust the company behind the app. We’ve also been upfront about our own conflict of interest: we ended up building one of these apps, TeenCycle, after we couldn’t find what we were looking for. We’ve included it in the list and let the criteria do the comparing.

What we evaluated.

Six criteria parents tend to care about, listed in roughly the order they end up mattering:

1. Privacy and data practices. What data does the app collect? Where does it live? Has the company been involved in a class action or FTC enforcement? Is data shared with third parties for advertising?

2. Age-appropriateness. Is the app designed for teens, or for adults who happen to be using it? Does the onboarding ask questions a 13-year-old shouldn’t have to answer (e.g., sexual activity)?

3. Pricing model. Free, freemium, subscription, or one-time? Freemium apps tend to push the upsell hard; subscriptions add up over years.

4. Simplicity. Does it do period tracking, or is it a wellness platform with feeds, communities, mood tracking, and notifications? More features means more screen time and more ways for the app to nudge the user back.

5. Track record. Has the company had a serious data privacy incident? This matters more than the policy on the website. A policy is a promise; a track record is evidence.

6. Specifically made for teens. Is the company building for young teens, or for adults who happen to menstruate?

At a glance.

The pattern: the apps built specifically for teens (Luna, Spot On, TeenCycle) feel different than the apps that added a "teen mode" to an adult product (Flo, Clue, Stardust). Apple Health is in a category of its own — basic, free, and not really a tracker.

The apps, one at a time.

Flo

Flo is the most-downloaded period app in the world and is built like it. The tracking is excellent, the predictions get smarter the more you log, and the in-app health library is extensive.

The problem is everything else. Flo’s pricing model is a subscription ($40+/year, indefinitely). Its onboarding asks about sexual activity early. And its track record is a real concern: in 2021, the FTC settled a case against Flo for sharing users’ period, pregnancy, and sexual activity data with Facebook and Google between 2016 and 2019 via embedded third-party SDKs. In 2025, Flo and Google settled a class action for a combined $56 million; Flurry settled a related claim for $3.5 million in April 2025; and a California jury found Meta liable for violating the California Invasion of Privacy Act over Flo app data.

The settlements don’t mean Flo’s current practices are unsafe. The FTC consent decree requires ongoing oversight, and the company has updated its disclosures. But they do mean: this is what the worst case looks like in this category. For a parent putting an app on a teen’s phone, "the company that became the FTC’s enforcement test case for period apps" is a hard thing to ignore.

Best for: an adult who wants the most full-featured tracker and is willing to manage privacy settings carefully.
Not for: a young teen, or a parent who’d rather not have her data on a company with this much enforcement history.

Clue

Clue is German-based and operates under GDPR. That’s not nothing. European privacy law is stricter than US privacy law, and Clue’s data lives on EU servers. The company states it does not share menstrual or other health data with advertisers, and Mozilla’s "Privacy Not Included" guide gives Clue a relatively favorable review.

The trade-offs: Clue is about $40/year for Clue Plus, the same general feature set as Flo (sexual activity tracking, fertility, pregnancy mode, menopause tracking), and the same general design philosophy — a wellness platform with periods at the center.

It also shares some non-health user data (device ID, IP address, general location) with third parties for advertising. The health data isn’t part of that, but a parent reading the privacy policy will see "we share data with third parties" and have to read carefully to know what is and isn’t included.

Best for: an adult or older teen who wants strong privacy without giving up the full feature set.
Not for: a parent who wants the data not to leave the phone at all.

Stardust

Stardust became the #1 health app in the US App Store in 2022, in the weeks after the Dobbs decision, on the strength of TikTok videos claiming the app used end-to-end encryption to keep user data safe from law enforcement.

Then TechCrunch investigated. The article found that the app at the time was sharing user phone numbers with a third-party analytics company in a way that could identify individual users. After TechCrunch reached out, Stardust removed the reference to end-to-end encryption from its privacy policy.

The current policy (last updated May 8, 2026) describes a more honest approach: health data is anonymized and tied to a random account ID, contact info is stored separately via an authentication platform, and voluntary data-sharing with law enforcement is no longer offered. It’s a defensible position, but it’s not what was originally claimed.

The app itself is aesthetically distinctive — astrology-coded design, lots of mood and "cosmic" framing. For some users that’s the appeal; for others it’s the reason to skip.

Best for: an older teen or adult who likes the design and is fine with the current, post-correction privacy model.
Not for: anyone who needs the privacy claims to have been right the first time.

Luna

Luna is one of the few commercial apps built specifically for teens. The design reflects that: no fertility tracking, no pregnancy mode, no intimate-activity prompts. It’s free at the base tier, with a Luna Premium subscription (monthly, annual, or lifetime) for extra content.

The standout feature is parent accounts. A parent can create a linked account to manage subscriptions and see high-level information (e.g., how many articles the teen read) without seeing what the teen tracks or asks. It’s a real attempt to thread the needle between teen privacy and parental visibility.

The downside: it’s still a freemium platform with a content library and an ongoing subscription path. The app uses notifications, and the engagement model is the standard wellness-app one. If you’d prefer a tracker that doesn’t keep trying to keep your daughter logged in, Luna is more app than tool.

Best for: a parent who wants oversight without surveillance, and is comfortable with a freemium model.
Not for: a family that prefers a one-time purchase and a no-notification setup.

Spot On (Planned Parenthood)

Spot On is free, built specifically for teens and young adults, and includes reproductive health education and LGBTQ+ inclusive content. It’s a Planned Parenthood product, which for some families is a strong recommendation and for others is a reason to look elsewhere. Set politics aside and the app itself is solid — clear, age-appropriate, no monetization pressure.

The privacy posture is reasonable; Planned Parenthood is a healthcare organization, not a data company. The trade-off is the app’s overt advocacy framing, which some parents will love and others will find off-putting depending on their views.

Best for: a family aligned with Planned Parenthood’s broader mission, looking for free, teen-focused, LGBTQ+ inclusive content alongside tracking.
Not for: families who’d prefer a tool with no political framing.

Apple Health

Apple Health has cycle tracking built in. It’s free, the data stays on the device and (if iCloud sync is on) in your iCloud account, and it doesn’t have a feed, ads, or onboarding questions about sexual activity.

It also barely does anything. The cycle tracking is minimum-viable: log periods, see predictions, that’s about it. There’s no education content, no detailed symptom logging, no app polish. For a teen who just wants the basics on a phone she already has, it’s a free starting point. For anyone wanting more than the basics, it falls short.

Best for: a teen who wants the simplest possible option and is on iPhone.
Not for: anyone who wants more than "log a date and see a prediction."

TeenCycle

Full disclosure: we built TeenCycle. We did so after trying every app on this list and not finding what we wanted for our teenage daughter. We’ve included it in the comparison so you can evaluate it on the same criteria.

What’s different: TeenCycle is 100% offline. There’s no account, no email, no cloud sync, no servers we can read. The app charges $9.99 once, after a 7-day free trial, and never again. There are three screens — a cycle dial, a calendar, and a settings page — and one tap to log a day. There are no notifications, no social features, no questions about sexual activity. It’s intentionally a tool, not a platform.

The trade-offs are real. If you switch phones, your data doesn’t follow you automatically — you export from the old device and import on the new one. There are no AI insights, no community, no symptom tracking beyond the basics. The app does one thing.

Best for: a teen who wants a private tracker that doesn’t keep her engaged, and a parent who wants a one-time price and no data anywhere it could be subpoenaed.
Not for: a user who wants extensive symptom tracking, AI predictions, or community features.

Try TeenCycle free for 7 days.

The pattern across all of them.

A few things stood out after three months of testing.

The free apps are the most expensive in the long run. Free almost always means the user is the product. The two biggest free apps in the category have either had FTC enforcement or share non-health user data with third parties for advertising. Free isn’t free.

Subscriptions add up. $40/year for ten years is $400. Most parents don’t sit down and do that math. It’s worth doing.

"Made for teens" is a small club. Luna, Spot On, and TeenCycle are the only major options designed from the start for teens. Most others are adult apps with a teen mode added on.

Sexual activity prompts are common, not rare. Most major commercial apps ask. Some only ask optionally; some ask prominently. For a young teen, the right number is zero.

The state-law backdrop is shifting fast. Utah, Louisiana, and California (and now Alabama, Texas, and more) are rolling out App Store Accountability Acts that require verifiable parental consent for app purchases by minors. By 2027 most teens in the US won’t be able to download or buy a paid app without parent involvement. That changes the equation: the parent isn’t an audience anymore; the parent is the buyer.

How to choose.

Skip the rankings and pick by what you actually want:

• You want the most features and don’t mind a subscription: Flo or Clue. Clue’s privacy posture is better; Flo’s tracking is more sophisticated.
• You want a teen-specific app with parent visibility: Luna.
• You want a free, age-appropriate, teen-focused app: Spot On.
• You want a tracker that doesn’t keep any data and doesn’t bill you twice: TeenCycle.
• Your daughter just wants something basic on her iPhone: Apple Health.

Whichever you pick, go read the privacy policy. Not the privacy summary on the App Store — the full policy. Look for who they share data with, where the data lives, what happens if you delete your account. The boring legal page is where the real product is.

What we’d want to know before downloading any period app.

Three questions worth asking before you install any tracker on your daughter’s phone:

1. Where does the data live? Phone-only, cloud, both?
2. Who’s the buyer? If the app is free, what’s the business model — is the data the product?
3. What does it ask on day one? Open the onboarding. If question two is about sexual activity, that tells you who the app was built for.

The right app for your daughter is the one that gives the answers you can live with.

Try TeenCycle free for 7 days.