A period tracker should fit both your routine and your comfort with sharing information. Start with what happens to your entries, then consider the features you will actually use.
Disclosure: this is lilMONSTER's blog, and we make lilCycles. This is a maker-written comparison, not an independent review. This iOS-focused shortlist includes our app and five alternatives. It compares stated needs and documented data practices, not an independently measured privacy ranking.
Our criteria come before the shortlist
Use the same questions for every app:
- Where does cycle history live? Distinguish device storage, optional backups and an account-backed online service.
- What identifies you? An account, an email address and an anonymous identifier are different things.
- What else gets collected? Look separately at health entries, usage analytics and advertising-related information.
- Can you leave safely? Check export, deletion and recovery before building up years of history.
- Does it suit your actual needs? A simple diary, wearable integration and pregnancy education are different jobs.
Competitor sources were rechecked from publisher sources on 19 October 2026. Where help-page HTML was blocked, we checked the same article through the provider's public JSON endpoint, linked below. These are documented features and disclosures, not our hands-on tests or an independent security audit. Unknown means unverified, not absent. We compare ordinary cycle tracking, not clinical effectiveness.
A fair comparison at a glance
| Tracker | Documented data model | A useful fit | Trade-off to consider |
|---|---|---|---|
| lilCycles | No account; device-local data; no cloud sync.[1] | Period, mood and strength-session logging together.[1] | Recovery needs planning around its encrypted backup/export archive.[1] |
| Apple Health Cycle Tracking | Device encryption; optional iCloud syncing with conditional end-to-end encryption.[2] | Tracking within Apple Health, including supported Watch inputs.[2] | Check iCloud and optional health-analytics settings.[2][3] |
| Euki | No accounts or backend/cloud data servers, according to its FAQ.[5] | Offline tracking without paywalls.[4][5] | Deleting the app deletes entered data.[5] |
| drip. | On-device storage; its policy says it collects no personal or usage data.[8] | An open-source tracker with import/export.[7] | Operating-system cloud backups may still apply.[8] |
| Flo | Anonymous Mode separates identity from health data; remote processing remains.[9] | Premium education, pregnancy and partner features.[10] | Anonymous does not mean device-only.[9] |
| Clue | Required account; health-history backup on EU servers.[11] | Plus analysis, perimenopause features and supported wearable integrations.[13] | It is an account-backed service, not local-only tracking.[11] |
The six options, with their limits
lilCycles: for cycle and strength-session logging together
lilCycles runs on iOS and Apple Watch. It logs periods, mood and strength sessions, with cycle predictions and phase guidance labelled "not medical advice". It is a wellness app for adults 18+, not contraception.[1]
It has no account, ads or analytics SDK, and no cloud sync. Its App Store privacy label is "Data Not Collected".[1] That makes it worth considering if avoiding an app account is a firm requirement.
The limits matter too. HealthKit integration writes but never reads Health data. Calendar export uses a dedicated calendar. "Delete all local data" does not remove samples already written to Apple Health.[1]
Optional AI summaries use on-device Apple Intelligence where available, or your own local model server, with a redacted payload preview before sending. The app works fully without AI.[1] Review that preview and your chosen destination rather than reading "local" as a promise that exports never happen.
Apple Health: start here if it already meets your needs
Apple's Cycle Tracking supports period logging, history and predictions. Supported watches can contribute physiological inputs; temperature-sensing models can provide retrospective ovulation estimates, subject to hardware and regional limits.[2]
For someone who wants tracking inside Health, that may be enough. You do not need to add another tracker simply because a roundup recommends one.
Apple describes device encryption and optional Health syncing through iCloud. End-to-end encryption depends on its documented device-security and account conditions.[2] Its optional Improve Health & Activity program can collect cycle-related information.[3] Review those settings instead of assuming all configurations have identical data flows.
Euki: a strong choice when avoiding paywalls matters
Euki describes itself as an independent nonprofit app with no paywalls.[4] Its FAQ says there are no user accounts, email requirements or backend data servers, and that the app works offline after download or update.[5]
It also documents period predictions, symptom logs, sexual-health education, optional PIN protection and immediate or scheduled deletion.[6] Those are worthwhile reasons to choose Euki rather than a subscription-based option.
Plan for data loss before relying on it. Euki says deleting the app deletes your entered data; cross-device recovery was not established in the reviewed evidence.[5] Device-local storage and a recoverable backup are separate requirements.
drip.: for people who value open source and portability
drip.'s iOS listing describes an open-source, noncommercial tracker with bleeding, mood, pain and other logs, charts, password protection and import/export.[7] It is a sensible shortlist entry if those are your priorities.
Its privacy policy says data stays on your device and that it collects no personal information or usage data. The same policy warns that operating-system cloud backups can occur depending on settings.[8]
That policy is dated 30 August 2022, although the research accessed it on 17 October 2026.[8] Treat it as a dated disclosure, not evidence of a fresh technical audit. Its app-level archive encryption was not verified in the research.[7][8]
Flo: consider it for education and partner features
Flo Premium documents educational content, personalised insights, pregnancy support and partner features, with some geographic differences.[10] It may suit you better if those features matter more than keeping all cycle processing on your device.
Flo says Anonymous Mode separates health data from names, email addresses and identifying technical information. It still uses an anonymous account and remote infrastructure.[9] That is a meaningful privacy distinction, but it is not local-only storage.
Flo's policy also says health data is excluded from its consent-based marketing flows.[9] Do not collapse every disclosed processor or advertising-related identifier into a claim that period entries are sold to advertisers.
Clue: consider it for analysis and wearable connections
Clue Plus documents deeper analysis, additional tracking categories, perimenopause support and supported wearable integrations.[13] For someone seeking those capabilities, it may be a better fit than lilCycles' period, mood and strength-session focus.[1][13]
Clue requires an account and backs up health history to EU servers.[11] Its privacy policy describes consent controls for research sharing and internal health analytics, alongside essential service-provider processing.[12]
This is a different balance between recovery, features and data handling. Clue's EU-server backup is not storage solely on your phone.[11]
Who should pick which
- Pick lilCycles if its combination of no-account tracking and strength-session logging matches your routine.[1]
- Start with Apple Health if its built-in workflow and supported Watch features already cover your needs.[2]
- Choose Euki if offline use and no paywalls are priorities.[4][5]
- Consider drip. if open source and import/export matter most.[7]
- Consider Flo for its documented Premium education and partner features.[10]
- Consider Clue for its Plus analysis, perimenopause support and wearable integrations.[13]
None of these recommendations requires pretending the other options are bad.
FAQ
Which period tracker is the most private?
This comparison does not establish a universal winner. Define your requirements first: avoiding an account, avoiding provider-held cycle history and having a recovery route are separate criteria.
Is Flo's Anonymous Mode the same as offline tracking?
No. Flo documents separating identity from health data while continuing remote processing.[9] Anonymous and device-only describe different properties.
Can I track without a subscription?
Euki says its app has no paywalls.[4] That is a fair reason to choose it. Privacy should not be assumed to require a paid plan.
Does deleting lilCycles erase my Apple Health entries?
No. Its "Delete all local data" control does not delete samples already written to Apple Health.[1] Manage those records separately.
Can I use lilCycles predictions as contraception or a diagnosis?
No. lilCycles is a wellness app, not contraception, and its phase guidance is labelled "not medical advice".[1] Take health concerns to a qualified clinician rather than treating a tracker prediction as a diagnosis.
Sources
Competitor sources below were rechecked from publisher sources on 19 October 2026, including official JSON versions of blocked help articles. Product facts were checked against the supplied audit on the same date. These are publisher disclosures unless otherwise noted.
[1] https:/
[2] https:/
[3] https:/
[4] https:/
[5] https:/
[6] https:/
[7] https:/
[8] https:/
[9] https:/
[10] https:/
[11] https:/
HTML returned 403; content checked through the same official article JSON: https:/
[12] https:/
[13] https:/
HTML returned 403; content checked through the same official article JSON: https:/