How we make this list: we compare pricing pages, product documentation and public user reviews. Rankite is independent; if a vendor ever pays for a featured spot, that listing is clearly labeled Partner.
Key takeaways
- Privacy matters more than features for teen trackers: Euki (free, nonprofit) stores everything on the device with no account, and Clue (Berlin-based) is protected by EU privacy law.
- Flo is the most popular pick with a dedicated teen mode, anonymous community and educational content; the core tracking is free, with Flo Premium as an optional subscription.
- MagicGirl is the only app here designed specifically for teens and tweens, with first-period videos, a diary with passcode lock and parental controls.
- Mozilla's 2026 privacy review ranked Stardust last (2/10) for sharing health data with an analytics firm, so families should know the tradeoff before downloading it.
Quick comparison
| Tool | Best for | Starting price | Free plan |
|---|
 Flo | Teens who want the most widely used tracker with a teen mode | Free (Flo Premium subscription optional) | Yes |
 Clue | Teens and parents who want science-based tracking under EU privacy law | Free (Clue Plus subscription optional) | Yes |
 Euki | Families who want the most private tracker available | Free | Yes (fully free, no premium tier) |
 MagicGirl | Tweens and young teens tracking their first periods | Free | Yes |
 Eve by Glow | Teens who want community support alongside tracking | Free (Glow Premium $59.99/year optional) | Yes |
 Spot On | Teens tracking birth control alongside their period | Free | Yes (fully free) |
 Period Tracker by GP Apps | Teens who want a simple calendar with no account and no fuss | Free (premium features optional) | Yes |
 Stardust | Older teens drawn to the astrology-themed tracking (with eyes open on privacy) | Free (in-app purchases optional) | Yes |
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The best period tracker app for teens
A teen's period tracker holds some of the most personal data a phone can carry: cycle dates, symptoms, moods, sometimes sexual activity and contraception. For adults that is a privacy preference. For teens it is a safety question, which is why this list weighs privacy and age-appropriate design as heavily as prediction accuracy. Every app here is free to start.
#1
Flo
Best for: Teens who want the most widely used tracker with a teen mode
Visit flo.health
Starting priceFree (Flo Premium subscription optional)
Free planYes
Flo is the default period tracker for a reason: it is polished, the predictions are solid, and the teen mode filters content and community discussions to be age-appropriate. Teens can ask questions anonymously in the community, read expert-reviewed articles about puberty, cramps and cycles, and get reminders without the fertility content that dominates the adult experience. The core cycle and symptom tracking costs nothing.
The tradeoff is data collection. Mozilla's 2026 privacy review scored Flo 7 out of 10: testing found health data stayed away from advertisers, but Flo collects more data than any other app tested. The anonymous mode helps, and it is worth turning on. For families comfortable with a mainstream app's data practices, Flo's teen experience is the most complete. For families that are not, Euki or Clue collect far less.
What we like- Dedicated teen mode with age-appropriate content and a supportive anonymous community
- 100-plus medical experts review the health content
- Anonymous mode option for extra privacy
Watch out for- The most data-hungry app here, with an AI symptom chatbot that collects broadly
- Premium upsells are persistent, and the free experience is ad-supported
#2
Clue
Best for: Teens and parents who want science-based tracking under EU privacy law
Visit helloclue.com
Starting priceFree (Clue Plus subscription optional)
Free planYes
Clue takes a deliberately grown-up approach: no flowers, no fertility assumptions, just cycle science. Teens get essential cycle statistics, period and PMS predictions and symptom tracking free, with content written from medical research rather than lifestyle tips. The privacy stance is the strongest of the mainstream apps: Clue states it has never sold health data and will not share it with authorities, and German and EU law backs that up. Mozilla scored it 8 out of 10.
The free tier covers what a teen needs: predictions, symptom logging and basic insights. Clue Plus adds advanced analysis, custom tracking categories and partner sharing. For a teen who wants a tracker that treats them like an adult and a parent who wants EU-grade privacy, Clue is the balanced pick. It is less playful than the teen-specific apps, which is either a feature or a drawback depending on the teen.
What we like- Berlin-based, so all user data is protected by strict EU privacy laws
- Granular controls let users separately opt out of research, analytics and advertising data sharing
- Science-driven content without pink cliches or fertility assumptions
Watch out for- The interface is clinical, which some teens find less fun than Flo or MagicGirl
- Advanced predictions and pattern analysis sit behind the Clue Plus subscription
#3
Euki
Best for: Families who want the most private tracker available
Visit eukiapp.org
Starting priceFree
Free planYes (fully free, no premium tier)
Euki is built by a nonprofit to solve exactly the problem this article is about. There is no account, no email, no phone number: download it and track. Everything stays on the device, nothing goes to a server, and there is no third-party tracking at all. A PIN lock protects the app, and scheduled sweeps can automatically delete sensitive entries. It also includes a vetted sexual health library and a care navigator for finding reproductive health providers.
Mozilla's 2026 review gave Euki the only 10 out of 10, calling out the local-only storage and the absence of accounts. The tradeoff is polish and pace: a small nonprofit team ships fewer delights than venture-funded competitors. For a teen whose privacy matters most, or a parent who has read the headlines about period data, Euki is the answer. It is completely free with no premium tier to upsell.
What we like- Nonprofit and open source, with all data stored only on the device and no account required
- PIN protection and scheduled data sweeps that delete sensitive information
- Mozilla's only perfect privacy score (10/10)
Watch out for- Smaller development team means slower feature updates than Flo or Clue
- The design is functional rather than delightful, which may not engage younger teens
#4
MagicGirl
Best for: Tweens and young teens tracking their first periods
Visit magicgirl.me
Starting priceFree
Free planYes
MagicGirl is the only app here built for teens first. The content assumes a first period, not a tenth year of tracking: videos on what to expect, how to use and dispose of pads, what cramps mean, and which hygiene products fit. The period and symptom tracker uses friendly graphics, the diary locks with a passcode, and reminders cover periods, fertile days and pill schedules. Medical professionals assemble the advice library.
Parents get controls to silence the advanced notifications (fertility content is not for every 12-year-old). The app is free with optional account backups. The honest limitation is the age ceiling: a 16-year-old may find the tone young and migrate to Flo or Clue. For the 11-to-14 window, when the first period arrives and the questions are basic, nothing else here speaks the language as well.
What we like- Designed specifically for teens and tweens, with first-period videos and hygiene guides
- Diary with passcode lock and parental controls for advanced content
- Chat feature to connect with other users
Watch out for- The design skews young, so older teens may outgrow it
- Fertility and pregnancy content exists in the app, though parental controls can silence it
#5
Eve by Glow
Best for: Teens who want community support alongside tracking
Visit glowing.com
Starting priceFree (Glow Premium $59.99/year optional)
Free planYes
Eve comes from Glow, one of the original period-tracking companies, and its strength is the community: millions of users discussing symptoms, asking "is this normal," and sharing experiences. For a teen who feels alone with a confusing symptom, that peer context has real value. The tracking covers periods, symptoms, moods and BBT-style charting, with daily insights tuned to the cycle phase.
The caveat is the audience. Eve's community and content are written for adult women, and a teen will encounter fertility and pregnancy discussions. Parents should know the peer advice is not medical guidance. Glow Premium at $59.99 a year adds comparative insights, premium articles and private messaging, but the free tier tracks fully. Best for older teens who want community; younger teens are better served by MagicGirl or Flo's teen mode.
What we like- Large, active community where users compare experiences and ask questions
- Cycle analysis and comparative insights ("is this normal?") help teens contextualize symptoms
- Glow Premium ($59.99/year after a 7-day trial) is optional, core tracking is free
Watch out for- Community content is unmoderated peer advice, not medical guidance
- The app's design and community skew adult, with less teen-specific framing than Flo or MagicGirl
Starting priceFree
Free planYes (fully free)
Spot On is the only tracker here from a healthcare provider, and it shows in the feature set: alongside period tracking, it handles every common birth control method with tailored reminders (daily for the pill, weekly for the patch, recurring for the ring). Planned Parenthood states plainly that it does not store personal data and that everything lives on the device and the user's own cloud backup. It is completely free with no premium tier.
Mozilla's review found the app itself sound but flagged the in-app browser used for provider searches as leaky, hence the 5 out of 10. The practical advice: use Spot On for tracking and reminders, and search for providers in a regular browser instead. For a teen on birth control, the method-specific reminders are genuinely useful, and the Planned Parenthood brand carries trust with both teens and parents.
What we like- Built by Planned Parenthood with birth control tracking (pill, patch, ring, shot, IUD, implant) and reminders
- Data stays on the device and cloud backup, not sold
- Trusted source for sexual health information
Watch out for- Mozilla scored it 5/10: the app itself is safe but its in-app browser for provider searches leaks data
- Predictions assume regular periods, so irregular teen cycles get less value
#7
Period Tracker by GP Apps
Best for: Teens who want a simple calendar with no account and no fuss
Visit gpapps.com
Starting priceFree (premium features optional)
Free planYes
GP Apps' Period Tracker is the old reliable of the category: one of the first period apps, still doing the basics well. Press a button when your period starts, log symptoms and moods from a long list, and see predictions on a clear calendar with monthly, yearly and list views. It works without an account, and the learning curve is zero.
The tradeoffs are modern ones. The interface looks its age, the free version shows ads, and the privacy story is the weakest here alongside Stardust: there are no strong published commitments about data handling. Premium features (backups, charts, ebooks, ad-free) cost extra. For a teen who wants the simplest possible tracker and does not care about design, it works. For a privacy-conscious family, Euki or Clue are better.
What we like- Dead simple: log period dates, get predictions, view the calendar
- No account required to use the core tracker
- Decades-old app with a huge user base and stable predictions
Watch out for- The design is dated and ad-supported on the free tier
- Privacy practices are less transparent than Clue or Euki, with no published privacy commitments to match
#8
Stardust
Best for: Older teens drawn to the astrology-themed tracking (with eyes open on privacy)
Visit thestardustapp.com
Starting priceFree (in-app purchases optional)
Free planYes
Stardust is popular with teens for a reason: it maps the menstrual cycle to lunar phases and astrology, with daily insights, hormone explanations and a beautiful interface. The social features let friends sync cycles, and the predictions cover periods, PMS, cravings and moods. It is free with optional in-app purchases.
The privacy record is the worst here, and families should know it before downloading. Mozilla's 2026 technical testing found Stardust sharing birthdates, birth control methods, pregnancy status, reproductive goals, moods and symptoms with analytics company RudderStack, earning it 2 out of 10. The company's marketing says it never sells or shares health data; the researchers' network traffic said otherwise. Older teens who love the concept should at least know the tradeoff. Everyone else should pick from the seven apps above.
What we like- Unique cycle-plus-lunar-calendar concept with daily hormonal insights teens find engaging
- Sync cycles with friends and partners
- Sleek modern design with high app-store ratings
Watch out for- Mozilla ranked it last (2/10): researchers found it sharing birthdates, birth control methods, pregnancy status, moods and symptoms with an analytics firm
- Its privacy marketing claims do not match the technical findings
The privacy question every family should ask first
Before comparing features, ask where the data lives. The best answer is "only on the device": Euki stores everything locally with no account, and Spot On keeps data on the device plus the user's own cloud backup. The next best is "with a company under strong privacy law": Clue operates under German and EU rules and lets users opt out of research, analytics and advertising sharing separately.
The answers to avoid are vague ones. Mozilla's 2026 technical review of six popular trackers found real differences: some apps sent device details to advertisers from the moment they opened, and one shared detailed health information with an analytics firm. Read the privacy policy before a teen enters a single symptom, and prefer apps that work without an account. A tracker that requires an email and a cloud profile to show a calendar is collecting more than it needs.
Free vs premium: what teens actually need
Every app here tracks periods free, and for most teens the free tier is enough. Premium subscriptions add advanced predictions, comparative insights, extra content and ad removal: nice to have, not necessary. The paid features that matter most for teens are usually the cheapest ones to get another way: a PIN lock (free in Euki and MagicGirl), discreet reminders, and educational content (free in Flo's teen mode and Euki's library).
Do not pay for a subscription before the teen has used the free tier for two full cycles. Prediction accuracy depends on logged history, not on the price tier, and a teen who will not log consistently on free will not log consistently on premium. If the family decides to pay, prefer annual billing over monthly: Flo, Clue and Glow all discount the yearly plan significantly.
Frequently asked questions
What is the safest period tracker for a teen's privacy?
Euki: it is nonprofit, open source, stores everything on the device, and requires no account. Mozilla gave it the only perfect privacy score in its 2026 review. Clue is the strongest mainstream option, protected by EU privacy law with granular sharing controls.
Should a teen use Flo?
Flo's teen mode is well designed, with age-appropriate content and an anonymous community. The tradeoff is data collection: Flo collects more data than its competitors. Turn on anonymous mode, skip the account if possible, and consider Euki or Clue if the family prefers minimal data collection.
At what age should a teen start tracking periods?
Whenever periods start, which for many is between 11 and 14. MagicGirl is designed for this window, with first-period guides and parental controls. There is no medical reason to wait: tracking helps teens learn what is normal for their bodies and gives them records to show a doctor if something seems off.
Are period tracker apps accurate for irregular teen cycles?
Less accurate at first, and that is normal: teen cycles are often irregular for the first couple of years. Predictions improve as the teen logs more history. No app should be used to predict fertility for avoiding pregnancy; every app here states this, and teens need to hear it plainly.
Do these apps share data with advertisers?
It depends on the app. Mozilla's 2026 testing found some apps sent device details to ad networks on launch, while Euki sent nothing anywhere and Clue kept health data out of advertising. Check the app's privacy policy and prefer apps that work without an account.
Can parents monitor a teen's period tracker?
Most apps are designed for the teen's own use, with PIN locks (Euki, MagicGirl) specifically to keep the data private. The healthier approach is conversation: help the teen pick a private app, explain what data it collects, and let them own their health information.
How we chose
We started with the categories families actually search: period tracker app for teens, teen period tracker, and safe period tracker. For each candidate we checked the vendor's own site and app listings for pricing and teen-specific features, reviewed Mozilla's 2026 privacy investigation of period trackers, and compared features against parent and teen guidance from health organizations. Where a price could not be verified we wrote "See website" rather than guessing.
Sources we checked (10)
- https://flo.health/
- https://helloclue.com/
- https://eukiapp.org/
- https://magicgirl.me/
- https://glowing.com/
- https://www.plannedparenthood.org/get-care/spot-on-period-tracker
- https://www.gpapps.com/
- https://www.thestardustapp.com/
- https://techsavvyed.co.uk/stardust-flo-and-other-popular-period-trackers-flunk-mozillas-latest-privacy-test/
- https://cyberinsider.com/mozilla-study-ranks-euki-as-the-most-private-period-tracker/
Is your product missing or out of date?
We review this list regularly. Vendors can request a listing, send updated pricing or ask about featured placement.
Shihab Mia · Founder, Rankite
Shihab has spent more than a decade helping SaaS and e-commerce brands grow through search. He writes Rankite's software buying guides from pricing pages, documentation and public user reviews. More about Shihab.