TLDR
The only period trackers that genuinely share no data are those that never have your data on a server. Floriva, Euki, and Drip all use on-device storage with no third-party analytics. Clue has no documented data-selling but still uses server storage. Flo settled a $59.5M class action in 2025 for confirmed data sharing.
| App | On-Device Storage | Account Required | Documented Violations | Price |
|---|---|---|---|---|
| Floriva | Yes | No | None | $2.99/mo |
| Euki | Yes | No | None | Free |
| Drip | Yes (Android) | No | None | Free |
| Clue | No (server) | Yes | None | Free / $9.99/mo |
| Flo | No (server) | Yes | FTC 2021, $59.5M 2025 | Free / $4.99/mo |
Floriva
On-device storage, no account required, no third-party SDKs. iOS and Android. $2.99/mo.
Pros
- ✓ Data stored on-device, no server to share from
- ✓ No account or email required
- ✓ No embedded analytics or advertising SDKs
- ✓ Opt-in encrypted sync for cross-device use
Cons
- × Paid subscription after 14-day trial
- × Smaller prediction dataset than established apps
Pricing: $2.99/mo or $24.99/yr
Verdict: The strongest privacy architecture among full-featured trackers. On-device storage means no data to share, not a promise not to share it.
Euki
Nonprofit developer. On-device, no account, free. iOS and Android.
Pros
- ✓ Nonprofit structure removes commercial data incentive
- ✓ On-device storage
- ✓ No account or email required
- ✓ Free
Cons
- × Limited feature set
- × No cross-device sync
- × Less frequent development updates
Pricing: Free
Verdict: Best free option. Nonprofit structure and on-device storage together make data sharing both structurally and commercially implausible.
Drip
Open source, Android only. No accounts, no server, no analytics. Free.
Pros
- ✓ Open source, privacy claims independently verifiable on GitHub
- ✓ No accounts, analytics, or server component
- ✓ Free
Cons
- × Android only
- × Minimal features
- × No cross-device sync
Pricing: Free
Verdict: Best for verifiable privacy. Open source code is the only way to confirm no-sharing claims without trusting a company's word.
Clue
Berlin-based, GDPR-compliant, no documented data-selling. Server-based. Free tier available.
Pros
- ✓ No documented history of data selling
- ✓ GDPR compliance limits commercial sharing
- ✓ No advertising business model
- ✓ Free tier
Cons
- × Server-based, data exists on Clue's servers
- × Account required
- × GDPR limits commercial use but not court orders
Pricing: Free / $9.99/mo
Verdict: Best among server-based apps. Clean record and no-ads model are real advantages. Not the same as no-sharing by architecture.
Flo Health
FTC enforcement action 2021. $59.5M class action settled 2025. Documented data sharing with Facebook and Google.
Pros
- ✓ Large user base, mature prediction algorithm
- ✓ Comprehensive features
- ✓ Anonymous Mode available (paid)
Cons
- × FTC enforcement action for data sharing (2021)
- × $59.5M class action settlement (2025)
- × Cloud-based architecture
- × Privacy requires paid subscription
Pricing: Free / $4.99/mo
Verdict: Not recommended for users concerned about data sharing. The FTC enforcement action documents confirmed sharing of reproductive health data with advertising platforms.
How We Ranked These Apps
The ranking here is based on architecture, not marketing claims or privacy policy language. The only period tracker that cannot share your data is one that never has your data on a server in the first place.
Every app on this list was evaluated on: whether it uses on-device or server-based storage, whether it requires account creation, whether it embeds third-party analytics or advertising SDKs, and whether it has a documented history of data sharing violations.
Policy claims, privacy certifications, and company statements were noted but not treated as equivalent to architectural controls. Flo had privacy policy claims. The FTC found those claims were not reflected in actual behavior. Architecture cannot be overridden by a policy change.
Why the Architecture Distinction Matters
The FTC’s 2021 enforcement action against Flo documented a pattern that is structurally possible in any cloud-based app with embedded third-party SDKs: the analytics code transmitted health data to advertising platforms independently of what Flo’s privacy policy said. Flo may not have intended to share data in the way the FTC described; the SDKs did what they were designed to do.
This is why on-device storage with no third-party SDKs is the only architecture that cannot produce an FTC enforcement scenario. There is no data on a server to share accidentally. There are no third-party SDKs to transmit data independently of company policy.
The Free Options
Users who want no-data-sharing and do not want to pay have two good options. Euki is developed by a reproductive health nonprofit and uses on-device storage with no account required. Drip is open source on Android, meaning the no-data claim can be independently verified. Both are functional period trackers with core cycle tracking and symptom logging.
Neither matches the feature depth of commercial apps, and neither offers cross-device sync. For users who primarily need cycle prediction and reminders, both cover the core use case.
The Paid Option With On-Device Storage
Floriva is the paid option in this category. At $2.99/mo, it costs less than Flo Premium ($4.99/mo) and substantially less than Clue Plus ($9.99/mo) or Natural Cycles ($12.99/mo). It covers more features than the free on-device trackers and is the only on-device option with optional encrypted cross-device sync on both iOS and Android.
Q&A
Which period tracker apps do not share data?
Apps that genuinely share no data: Floriva (on-device, iOS and Android, $2.99/mo), Euki (on-device, nonprofit, free), and Drip (on-device, open source, Android only, free). These apps store data exclusively on your device, making data sharing structurally impossible. Clue has no documented data-selling history but stores data server-side. Flo has documented FTC enforcement for data sharing in 2021 and a $59.5M settlement in 2025.
Q&A
What makes a period tracker safe from data sharing?
Three criteria: on-device storage so data never reaches a server, no embedded third-party analytics SDKs that transmit usage data, and no account requirement that links your identity to your health data. Apps that meet all three criteria cannot share your data because they do not have it. Apps that meet only policy criteria may not share your data, but the architecture permits it.
Source: Reuters / FTC, September 2025
Source: Clue pricing page
Source: Floriva pricing
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