TLDR
After Flo's $59.5M settlement, more women are evaluating health apps by data architecture, not brand recognition. The apps on this list either store data on-device, have no commercial data incentive, or operate under GDPR with no documented violations. The best overall option for period tracking with structural privacy is Floriva.
| App | Category | On-Device | Account Required | Price |
|---|---|---|---|---|
| Floriva | Period tracking | Yes | No | $2.99/mo |
| Euki | Reproductive health | Yes | No | Free |
| Drip | Period tracking | Yes (Android) | No | Free |
| Signal | Secure messaging | N/A | Phone number | Free |
| Clue | Period tracking | No | Yes | Free / $9.99/mo |
Floriva (Period Tracking)
On-device period tracker, iOS and Android, no account required. $2.99/mo.
Pros
- ✓ On-device storage, no server to subpoena
- ✓ No account or email required
- ✓ No third-party analytics SDKs
- ✓ Cross-device encrypted sync available
Cons
- × Paid subscription required
- × Smaller feature set than Flo or Clue
Pricing: $2.99/mo or $24.99/yr
Verdict: Best privacy architecture for period tracking. On-device storage is structural, not policy-based.
Euki (Reproductive Health)
Nonprofit reproductive health app covering periods, contraception, pregnancy, and STI information. On-device, free.
Pros
- ✓ Broad reproductive health scope beyond just period tracking
- ✓ Nonprofit developer (Ibis Reproductive Health)
- ✓ On-device storage, no accounts
- ✓ Free
Cons
- × No cross-device sync
- × Less polished interface than commercial apps
Pricing: Free
Verdict: Best free option for reproductive health privacy. Nonprofit structure and on-device architecture align with the mission.
Drip (Period Tracking, Android)
Open source Android period tracker. No accounts, no server, no analytics. Free.
Pros
- ✓ Open source, code publicly auditable
- ✓ No data collection of any kind
- ✓ Free
Cons
- × Android only
- × Basic feature set
Pricing: Free
Verdict: Best verifiable privacy. Open source is the only way to confirm privacy claims without trusting company statements.
Signal (Secure Communication)
End-to-end encrypted messaging for discussing health topics securely. Not a health tracker, but relevant for women discussing reproductive health.
Pros
- ✓ End-to-end encryption, open source
- ✓ Minimal metadata collection
- ✓ Nonprofit Signal Foundation
Cons
- × Not a health tracking app
- × Requires contacts to also use Signal
Pricing: Free
Verdict: Recommended for secure communication about health topics, not as a tracker replacement.
Clue (Period Tracking)
GDPR-compliant Berlin-based period tracker with no documented data violations. Server-based. Free tier available.
Pros
- ✓ GDPR compliance, no documented violations
- ✓ No advertising business model
- ✓ Free tier available
Cons
- × Server-based, subpoenable
- × Account required
Pricing: Free / $9.99/mo
Verdict: Best privacy record among server-based period trackers. Not the same as on-device architecture.
The Post-FTC Framework for Evaluating Health App Privacy
The Flo FTC enforcement action in 2021 and the $59.5M class action settlement in 2025 shifted how many women evaluate period and reproductive health apps. The question moved from “does this app have a good privacy policy?” to “what is the app’s data architecture, and what can I verify?”
This list ranks apps on architecture first: where does the data live, is there a server component, and can the privacy claims be independently verified? Policy statements and company promises are noted, but an app with on-device storage and no third-party SDKs is structurally different from an app with a good privacy policy.
The Broadest Context: Reproductive Health Data Specifically
Period and reproductive health data is more sensitive than most categories of personal information. It can indicate pregnancy, fertility status, contraceptive use, and in some US states, information relevant to criminal proceedings under abortion restriction laws. The FTC’s enforcement action against Flo specifically referenced the sensitivity of this data category.
This sensitivity is the context for evaluating apps. A data breach or a court-ordered disclosure of your streaming preferences is a different category of harm from the same event applied to your reproductive health data. The apps on this list were evaluated with that context in mind.
Why Signal Is on This List
Signal is not a health tracking app. It is on this list because reproductive health discussions often happen via messaging, and the messaging platform matters. Texts can be subpoenaed, standard messaging carries metadata, and iCloud message backups can be accessed via legal process. Signal’s end-to-end encryption and minimal metadata retention make it the appropriate tool for conversations about reproductive health in situations where privacy matters.
Using an on-device period tracker alongside a secure messaging app covers the two main digital vectors for reproductive health data exposure.
Q&A
What are the most private women's health apps?
The most private women's health apps for period tracking are those that use on-device storage: Floriva (iOS and Android, $2.99/mo), Euki (reproductive health, free, nonprofit), and Drip (Android, free, open source). For secure communication about reproductive health, Signal is the standard recommendation. For period tracking with the best record among server-based apps, Clue has no documented violations and operates under GDPR.
Q&A
Which health apps are safe after Roe v. Wade was overturned?
Apps that store data only on your device cannot be subpoenaed for your health data because there is nothing on a server to hand over. Floriva, Euki, and Drip fit this description for period tracking. Server-based apps like Clue and Natural Cycles have better records than Flo but still create server-side exposure. The structural safety question is about where data lives, not just what the company promises.
Source: Reuters / FTC, September 2025
Source: Floriva pricing
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