The Most Private Period Tracker Apps of 2026
We checked 36 period apps and ranked the 9 most private by account, where data lives, trackers and FTC record.
7 min read
How we review
Period Tracker Apps is run by the team that makes Hello Phase, the app ranked first here (how we review). We checked each app's store listing, privacy label, official records and reviews on 26 October 2026 without hands-on testing of each one, we say where another app is more private than ours, and there are no affiliate links on this page.
Our pick
Hello Phase Our app
Most private full-featured tracker on Android- Needs no account and keeps your log on your phone
- Shows no ads or third-party trackers
- Lists no data shared in Google Play Data safety
Quick answer. Hello Phase is the most private full-featured period tracker on Android. It needs no account, keeps your logs on your phone, has no ads or third-party trackers, lists no data shared in Google Play Data safety, and includes a free hormone chart and exports. If you want open source code and a label declaring no data collected, pick drip, or Euki for a decoy passcode. On iPhone, Apple Health is the simplest choice.
Top picks at a glance
- 1Hello PhaseMost private full-featured tracker on Android
- 2
drip period & cycle trackerBest open source pick - 3
EukiDecoy passcode, nonprofit open source - 4Apple Health, Cycle TrackingiPhone users who want no extra app
- 5
Period Diary: Privacy FirstPaying once, with data on the iPhone - 6
My period calendar PinkllamaWell-rated no-sign-up calendar on iPhone - 7
My CycleFree iPhone app with no in-app purchases - 8
Flo Cycle & Period TrackerStaying with a big app - 9
Natural Cycles: Fertility AppBirth control users who want an anonymous option
How we picked the apps
We checked 36 period apps on privacy labels, account rules, data storage, ads, trackers, open source code and any FTC, state, court or audit finding, and every app here was updated in the last 18 months. Hello Phase ranks first for pairing no account, no ads, no third-party trackers and no data shared with a free hormone chart and exports, while drip and Euki go further by declaring no data collected.
Side by side
| App | Account needed | Data stored | Privacy label | Ads or trackers | Privacy record |
|---|---|---|---|---|---|
| Hello Phase | No | On your phone. Optional coach sends a small slice after you agree | Play, no data shared, some data collected | No ads, no third-party trackers | None found |
| drip period & cycle tracker | No | On your phone | Apple "Data Not Collected". Play, no data collected or shared | None | None found. Open source |
| Euki | No | On your phone only | Apple "Data Not Collected". Play, no data collected or shared | None | Mozilla 2026 score 10/10. Open source |
| Apple Health, Cycle Tracking | Apple ID only | On iPhone, encrypted. Optional end-to-end iCloud backup | Built in, no store label | No ads | None found |
| Period Diary: Privacy First | No | On your iPhone, per the developer | Apple "Data Not Linked to You", no health data listed | No tracking. Ads not stated | None found |
| My period calendar Pinkllama | No | On your iPhone, per the developer | Apple "Data Not Linked to You", no health data listed | No tracking. Ads not stated | None found |
| My Cycle | No app account | On iPhone, with iCloud sync per a user review | Apple "Data Not Linked to You", health data listed | No tracking. A 2024 review says no ads | None found |
| Flo Cycle & Period Tracker | Sign-in available, plus Anonymous Mode | Not described as on-device | Apple "Data Used to Track You". Play, no data shared | Apple label lists tracking | FTC order 2021. Jury verdict against Meta 2025. Mozilla 2026 score 7/10 |
| Natural Cycles: Fertility App | Yes, with Go Anonymous | With your Natural Cycles account | Apple "Data Used to Track You" (contact info). Play, no data shared | No ads. Apple label lists tracking | None found |
The apps
Hello Phase
Most private full-featured tracker on Android- Free, Plus $39.99
- Android
- No Play rating yet, 1K+ installs
- Privacy label
- Play, no data shared, some data collected
- Free plan
- Yes. Logging, predictions, hormone chart, CSV and PDF export
What stands out
- Your period dates, check-ins, patterns and coach chats are kept in the app's private storage on your phone, with nothing to sign up for.
- The free plan covers the daily log, predictions for the next three cycles, the estimated hormone chart and export as CSV or a one-page PDF.
Watch out for
- It is Android only, and its Data safety section lists some data collected, though none shared.
- The optional AI coach sends a small slice of context, such as your cycle day and recent moods and symptoms, only after you agree, and you can turn that off in Settings.
The full list of what leaves the phone is in our privacy policy, and the pricing page and FAQ cover what Plus adds.
Get it onGoogle Play
Price, account and privacy details
- Best for
- The most private full-featured period tracker on Android
- Price (US, checked 26 Oct 2026)
- Free for tracking. Plus is $39.99 a year or $12.99 a month on Google Play.
- Platforms
- Android. There is no iPhone version yet.
- Account
- None, with no sign up and no login
- Privacy
- Google Play Data safety lists no data shared with third parties and some data collected, such as health and fitness and app activity. No ads and no third-party trackers.
- Ratings
- No Google Play rating yet, 1K+ installs, updated Oct 1, 2026. Store title "Hormone Tracker - Hello Phase".
drip period & cycle tracker
Best open source pick- Free, no in-app purchases
- iPhone, Android
- 4.02 (59) App Store
- 4.2 (470) Google Play
- Privacy label
- Apple "Data Not Collected". Play, no data collected or shared
- Free plan
- Everything
What stands out
- drip pairs open source code, still active on GitLab in October 2026, with no account and a "Data Not Collected" label on both stores.
- It follows the symptothermal method, so you can log temperature and cervical mucus too.
Watch out for
- Its App Store score rests on just 59 US ratings, the iPhone version was last updated in January 2026, and one reviewer reported crashes.
On the App Store and Google Play, at dripapp.org, and with its code on GitLab.
Price, account and privacy details
- Best for
- The best open source pick, on iPhone or Android
- Price (US, checked 26 Oct 2026)
- Free, with no in-app purchases on either store
- Platforms
- iPhone and Android
- Account
- None. The developers say drip "leaves your data on your phone".
- Privacy
- Apple label "Data Not Collected". Google Play Data safety lists no data collected or shared.
- Ratings
- 4.02 (59 US ratings) on the App Store, updated Jan 14, 2026. 4.2 (470 reviews) and 100K+ installs on Google Play, updated Oct 24, 2026.
Euki
Decoy passcode, nonprofit open source- Free
- iPhone, Android
- 4.17 (162) App Store
- 3.7 (359) Google Play
- Privacy label
- Apple "Data Not Collected". Play, no data collected or shared
- Free plan
- Everything
What stands out
- Euki is open source from an independent 501(c)(3) nonprofit, and Mozilla's 2026 study gave it 10 out of 10, according to CyberInsider.
- Its PIN and decoy code are built for when someone pressures you to open the app.
Watch out for
- Neither store shows an update since 4 September 2025, and a May 2026 Google Play reviewer lost their data after reinstalling the app.
On the App Store and Google Play, at eukiapp.org, and with its code on GitHub.
Price, account and privacy details
- Best for
- A decoy passcode and open source code from a nonprofit
- Price (US, checked 26 Oct 2026)
- Free. The developer calls it "100% free", with no paywall.
- Platforms
- iPhone and Android
- Account
- None. Data is stored on your phone only, behind a PIN and a decoy code.
- Privacy
- Apple label "Data Not Collected". Google Play Data safety lists no data collected or shared.
- Ratings
- 4.17 (162 US ratings) on the App Store, 3.7 (359 reviews) and 100K+ installs on Google Play, both last updated Sep 4, 2025
Apple Health, Cycle Tracking
iPhone users who want no extra app- Free, built in
- iPhone, Apple Watch
- Built in, no store rating
- Privacy label
- Built in, no store label
- Free plan
- Everything
What stands out
- Apple says Health data is encrypted while the iPhone is locked, and that on iOS 12 or later with two-factor authentication, Health data backed up to iCloud is end-to-end encrypted so Apple "will not be able to read your health data".
Watch out for
- It works only on iPhone, and its fertile window is a six-day estimate from the traditional calendar method.
Read Apple's Cycle Tracking guide and the privacy page for the Health app.
Price, account and privacy details
- Best for
- iPhone users who want private tracking without another app
- Price (US, checked 26 Oct 2026)
- Free, built into iPhone and Apple Watch
- Platforms
- iPhone and Apple Watch
- Account
- Your Apple ID only, with no separate app account
- Privacy
- Built into iOS, so there is no App Store label
- Ratings
- Built in, so there is no store rating
Period Diary: Privacy First
Paying once, with data on the iPhone- $9.99 once (lifetime)
- iPhone
- 4.10 (429) App Store
- Privacy label
- Apple "Data Not Linked to You", no health data listed
- Free plan
- Not stated
What stands out
- Its label lists no health data at all, and one $9.99 payment replaces a subscription.
Watch out for
- It is iPhone only, the listing does not say whether there are ads, and it is not the old Period Diary by Nanobit, now IVY, which needs an account.
On the App Store.
Price, account and privacy details
- Best for
- Paying once for an iPhone app that keeps everything on the device
- Price (US, checked 26 Oct 2026)
- "Period. Premium Lifetime" is $9.99 once in the App Store. The listing does not say what is free.
- Platforms
- iPhone
- Account
- None. The developer says "No Account Required" and "100% On-Device Storage".
- Privacy
- Apple label "Data Not Linked to You" for identifiers, usage data and diagnostics, with no tracking
- Ratings
- 4.10 (429 US ratings) on the App Store, updated Sep 23, 2026
My period calendar Pinkllama
Well-rated no-sign-up calendar on iPhone- Not labeled, $4.99 to $99.99 listed
- iPhone
- 4.79 (19,199) App Store
- Privacy label
- Apple "Data Not Linked to You", no health data listed
- Free plan
- Not stated
What stands out
- Its label lists no health and fitness data and no tracking, backed by far more ratings than drip, Euki or Period Diary: Privacy First.
Watch out for
- Its last update was on 28 March 2026, and we could not confirm whether the free version shows ads.
On the App Store.
Price, account and privacy details
- Best for
- A well-rated calendar on iPhone with no sign-up
- Price (US, checked 26 Oct 2026)
- The App Store lists in-app purchases from $4.99 to $99.99 without billing periods.
- Platforms
- iPhone
- Account
- None. The developer says "No sign-ups are required" and that your data "exists on your device".
- Privacy
- Apple label "Data Not Linked to You" for user content, usage data and diagnostics, with no tracking
- Ratings
- 4.79 (19,199 US ratings) on the App Store, updated Mar 28, 2026
My Cycle
Free iPhone app with no in-app purchases- Free
- iPhone
- 4.80 (102,694) App Store
- Privacy label
- Apple "Data Not Linked to You", health data listed
- Free plan
- Everything
What stands out
- My Cycle is the most-rated app here whose label shows no tracking, and a 2024 App Store reviewer called it "free with no ads".
Watch out for
- Its label lists health and fitness data as collected, though not linked to you, which puts it a step below the apps that declare less.
On the App Store.
Price, account and privacy details
- Best for
- A free iPhone app with no in-app purchases
- Price (US, checked 26 Oct 2026)
- Free, with no in-app purchases
- Platforms
- iPhone
- Account
- No app account. A September 2026 review asks for an account option instead of iCloud, so syncing appears to run through your iCloud.
- Privacy
- Apple label "Data Not Linked to You", including health and fitness data, with no tracking
- Ratings
- 4.80 (102,694 US ratings) on the App Store, updated Sep 2, 2026
Flo Cycle & Period Tracker
Staying with a big app- Not labeled, $1.99 to $59.99 listed
- iPhone, Android
- 4.74 (2,005,621) App Store
- 4.7 (5.16M) Google Play
- Privacy label
- Apple "Data Used to Track You". Play, no data shared
- Free plan
- Yes, includes Anonymous Mode
What stands out
- Anonymous Mode lets you use the app without personal identification, and Mozilla's 2026 study, which gave Flo 7 out of 10, found that declining its optional settings cut its calls to AppsFlyer, Moloco and Firebase.
Watch out for
- Flo is the app in the 2021 FTC order and the Frasco v. Flo case below, and its Apple label still lists data used to track you.
On the App Store and Google Play. If you are leaving Flo, our Flo alternatives guide sorts the options by why people switch.
Price, account and privacy details
- Best for
- Staying with a big app while limiting what is tied to you
- Price (US, checked 26 Oct 2026)
- Free plan available. The App Store lists Flo Premium from $1.99 to $59.99 without billing periods.
- Platforms
- iPhone and Android
- Account
- Sign-in available, plus an Anonymous Mode
- Privacy
- Apple label "Data Used to Track You" for purchases, location, identifiers and usage data. Google Play Data safety says no data shared.
- Ratings
- 4.74 (2,005,621 US ratings) on the App Store, 4.7 (5.16M reviews) on Google Play, updated Oct 22, 2026
Natural Cycles: Fertility App
Birth control users who want an anonymous option- $149.99
- iPhone, Android
- 4.79 (30,293) App Store
- 4.4 (23.5K) Google Play
- Privacy label
- Apple "Data Used to Track You" (contact info). Play, no data shared
- Free plan
- Not confirmed
What stands out
- The FDA cleared Natural Cycles as a birth control app in August 2018, and its Go Anonymous option separates your identity from your fertility data.
Watch out for
- It needs an account and a $149.99 yearly subscription, the priciest here, and its Apple label lists health, fitness and sensitive info as linked to you.
On the App Store and Google Play, with the Go Anonymous help page.
Price, account and privacy details
- Best for
- Birth control users who want an anonymous option
- Price (US, checked 26 Oct 2026)
- Annual $149.99 or Monthly $21.99 in the App Store. The listing does not say what is free without a subscription.
- Platforms
- iPhone and Android
- Account
- Required, with a Go Anonymous option
- Privacy
- Apple label "Data Used to Track You" for contact info. Google Play Data safety says no data shared.
- Ratings
- 4.79 (30,293 US ratings) on the App Store, updated Oct 15, 2026. 4.4 (23.5K reviews) on Google Play.
Find the right app for you
What did the FTC find about period apps?
In June 2021 the FTC finalized an order with Flo Health over allegations that it shared sensitive health data with Facebook and Google, and in May 2023 it proposed barring Easy Healthcare, the maker of Premom, from sharing health data for advertising. California settled with Glow for $250,000 in 2020 over security weaknesses, and in August 2025 a jury in Frasco v. Flo found that Meta violated California privacy law by collecting menstrual health data from Flo, with $56 million in Google and Flo settlements since given preliminary approval.
Why does an app that says it is private show "Data Used to Track You"?
The description is the developer's own marketing, while the App Store label and Data safety section follow a format Apple and Google set, and Apple counts linking your data with other companies' data for targeted ads as tracking. Period Tracker Period Calendar by ABISHKKING says "Your data stays 100% on your device", yet its App Store label lists identifiers and usage data as used to track you.
A clean label is no guarantee either, since Stardust's says "No data shared" while TechCrunch reported in July 2026 that Mozilla found it sharing users' health data with RudderStack. Before you trust the word "private", look for "Data Not Collected" or "Data Not Linked to You" with no tracking.
Data Not Collected
Declares nothing collected
- drip
- Euki
Data Not Linked to You
Collected, not tied to your identity
- Period Diary
- Pinkllama
- My Cycle
Data Used to Track You
Linked with other companies' data for ads
- Flo
- Natural Cycles*
* The Natural Cycles label also lists health, fitness and sensitive info as linked to you. Hello Phase is Android only, so it has no Apple label, and its Google Play Data safety section lists some data collected and none shared. Apple Health is built into iOS, so there is no App Store label.
Which period apps keep your data only on your phone?
Hello Phase keeps your logs on the phone, with the optional coach sending cycle details out only after you agree, and drip, Euki, Period Diary: Privacy First and Pinkllama say your data stays on the device. With no account to restore from, a lost phone can take your history with it, so export a file now and then.
Apps we left out and why
Clue scored 8 out of 10 with Mozilla but has required an account for new users since 2019 and lists device IDs as shared for advertising or marketing on Google Play, and our guide to the best period tracker apps covers its other strengths. Stardust scored 2 out of 10, TechCrunch reported in 2022 that it sent users' phone numbers to Mixpanel, and Vice reported a since-changed policy allowing disclosure to law enforcement "whether or not legally required".
Premom has the 2023 FTC action, Glow and Eve by Glow carry "Data Used to Track You" labels, Spot On by Planned Parenthood scored 5 out of 10 with Mozilla, Period Calendar by Simple Design and Ovulation & Period Tracker by Leap Fitness show ads, and Ovia and Samsung Health list health data as shared.
How to choose
On Android, pick Hello Phase for a free hormone chart and exports with no account, no ads and no data shared. Pick drip if you want a label that declares no data collected on either phone, or Euki for a decoy code with slower updates. On iPhone, use Apple Health, and if cost matters too, our guide to free period tracker apps shows what each one charges for.
Questions people ask
What is the most private period tracker app?
On Android, Hello Phase is the most private full-featured tracker we found, with no account, logs kept on your phone, no ads or third-party trackers, no data shared in Google Play Data safety, and a free hormone chart and exports. For open source code and a label that declares no data collected, pick drip or Euki, and on iPhone, use Apple Health.
Do period tracker apps sell your data?
Most say they do not, but some have shared it. The FTC said Flo shared health data with Facebook and Google and that Premom shared data with AppsFlyer, Google and two Chinese companies, so check the privacy label and Data safety section before you log anything.
Which period tracker apps work without an account?
Hello Phase, drip, Euki, Period Diary: Privacy First, My period calendar Pinkllama and My Cycle work without an account, and Apple Health uses only your Apple ID. Clue has required an account for new users since 2019, and Natural Cycles, Ovia, Glow, Premom and Stardust require one too.
Can I use Flo privately?
Partly, by turning on Anonymous Mode, which launched in September 2022, and by declining its optional settings. Its Apple label still lists purchases, location, identifiers and usage data as used to track you.
Are open source period trackers more private?
Open source lets anyone read the code, so a privacy promise can be checked by outsiders instead of taken on trust. drip and Euki are the two open source period trackers we found, and Hello Phase is not open source.
Does Hello Phase collect any data?
Yes, a little. Your logs stay on your phone with no account, but the optional AI coach sends your question, cycle day and recent moods and symptoms after you agree, the app sends small usage events with no cycle data, and its Google Play Data safety section lists data collected with none shared.
Try Hello Phase
Hello Phase is free on Android with no account, no ads and no third-party trackers, and our guides to the best hormone tracker apps and the best PMDD tracker apps go deeper on those jobs.
Get it onGoogle PlayReferences
Store listings for every app are linked from its card above and were checked on 26 October 2026.
- FTC, order finalized with Flo Health, June 2021
- FTC, proposed order against Premom (Easy Healthcare), May 2023
- California Attorney General, settlement with Glow, Inc., September 2020
- CNBC, jury rules Meta violated law in period tracking app data case, August 2025
- TechCrunch, jury rules Meta violated California privacy law over Flo data, August 2025
- Bloomberg Law, Google and Flo $56 million privacy settlement gets early approval
- TechCrunch, Stardust shares users' health data with analytics firm, Mozilla research, July 2026
- CyberInsider, Mozilla study ranks Euki as the most private period tracker, 2026
- Digital Health Insights, Mozilla report on privacy gaps in period tracking apps, 2026
- TechCrunch, Stardust and users' phone numbers, June 2022
- Vice, Stardust privacy policy and law enforcement, 2022
- Apple Developer, App privacy details and the definition of tracking
- Apple, Health app and privacy
- Apple Platform Security, protecting access to users' health data
- Apple Support, Cycle Tracking
- Clue, why an account is needed
- Flo, Anonymous Mode launch
- Natural Cycles help center, What is Go Anonymous
- STAT, FDA clears Natural Cycles app, August 2018
- Euki website and Euki code on GitHub
- drip website and drip code on GitLab
- Hello Phase privacy policy
- Hello Phase pricing
History of updates
- , first published
Hello Phase is for tracking and learning about your cycle. It is not a contraceptive and it does not diagnose medical conditions.