Best Period Tracker Apps That Don't Sell Your Data (2026)
TLDR
Floriva and Euki are the strongest picks if your priority is provable data non-selling — both store data on-device so there is nothing to sell or subpoena. If you want iOS and Android with encrypted sync, Floriva is the only on-device option. Flo, Spot On, and Premom have documented data-sharing histories and belong in the avoid column.
| App | Data Sold? | On-Device Storage? | Platform | Price |
|---|---|---|---|---|
| Floriva | No | Yes | iOS + Android | $2.99/mo |
| Euki | No | Yes | iOS + Android | Free |
| Drip | No | Yes | Android only | Free |
| Clue | No documented history | No (server-based) | iOS + Android | Free / $9.99/mo |
| Natural Cycles | No documented history | No (server-based) | iOS + Android | $12.99/mo |
| Flo | Yes (FTC enforcement action 2021; $59.5M class action settled 2025) | No | iOS + Android | Free / Premium |
| Spot On | No documented history | No (server-based) | iOS + Android | Free |
| Premom | Yes (FTC 2023) | No | iOS + Android | Free |
Floriva
On-device storage, no account required, encrypted cross-device sync available. No documented data-sharing history. iOS and Android.
Pros
- ✓ Data stored on-device by default — no server to subpoena
- ✓ No account creation required to start tracking
- ✓ Encrypted cross-device sync for users who want it
- ✓ No ad targeting or third-party SDK data sharing
Cons
- × Paid app ($2.99/mo or $24.99/yr after 14-day trial)
- × Newer product — smaller prediction dataset than Flo or Clue
Pricing: $2.99/mo or $24.99/yr (14-day free trial)
Verdict: Best overall for data privacy. On-device architecture makes data-selling structurally impossible, not just policy-prohibited.
Euki
Built by Ibis Reproductive Health (nonprofit). On-device storage, no data collection, no accounts. iOS and Android. Free.
Pros
- ✓ Nonprofit developer with no commercial incentive to monetize data
- ✓ On-device storage — data never leaves your phone
- ✓ No account required
- ✓ Free with no ads
Cons
- × No cross-device sync — data lives on one device only
- × Fewer prediction features than commercial apps
- × Less active development cadence than funded competitors
Pricing: Free
Verdict: Best free option. Nonprofit structure removes the business model pressure that led Flo and Premom to share data in the first place.
Drip
Open source Android app. No accounts, no data collection, no analytics SDKs in the codebase. Source code publicly auditable.
Pros
- ✓ Open source — anyone can verify what the app does with data
- ✓ No accounts, no server, no analytics SDKs
- ✓ Free
Cons
- × Android only — no iOS version
- × Basic UI; fewer symptom logging options
- × No cross-device sync
Pricing: Free
Verdict: Best for Android users who want code-level verification of privacy claims. Open source removes the need to trust developer promises.
Clue
Berlin-based, GDPR-compliant, no ads. Server-based storage. No documented FTC enforcement actions or data-selling history.
Pros
- ✓ GDPR-compliant under EU law — stronger than US privacy standards
- ✓ No advertising business model
- ✓ Strong cycle prediction with scientific backing
- ✓ iOS and Android
Cons
- × Server-based storage — data can be subpoenaed from Clue's servers
- × Requires account creation
- × Premium features cost $9.99/mo
Pricing: Free tier / $9.99/mo premium
Verdict: Best server-based option. GDPR compliance and no-ads model are meaningful, but on-device storage is a stronger privacy guarantee than any policy.
Natural Cycles
FDA De Novo clearance for contraception (2018). No documented data-selling history. Server-based, requires account.
Pros
- ✓ FDA-cleared — regulatory accountability beyond app store policies
- ✓ Temperature-based method reduces reliance on algorithmic prediction
- ✓ No documented data-sharing with advertisers
Cons
- × Server-based — data is on Natural Cycles' servers
- × Most expensive option at $12.99/mo or $99.99/yr
- × FDA clearance is for contraception efficacy, not a privacy guarantee
- × Requires account creation
Pricing: $12.99/mo or $99.99/yr
Verdict: Acceptable for contraception tracking specifically. The FDA clearance signals accountability but doesn't address server-side data exposure.
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Why “No Data Selling” Needs Architecture, Not Just Policy
Most period tracker apps claim not to sell your data. Flo made the same claim — then the FTC found they shared user health data with Facebook and Google SDKs. The gap between what apps promise and what they actually do with data is documented and consequential.
The most meaningful distinction is architectural: apps that store data on-device cannot sell what they don’t have. Apps that store data on servers can — and in some cases have — shared that data regardless of their stated policies.
For reproductive health data specifically, the post-Dobbs legal environment adds a second dimension. Law enforcement in states with abortion bans has sought health app records in investigations. On-device storage eliminates that exposure because there are no server-side records to hand over.
How We Ranked These Apps
Rankings prioritize architecture over policy promises. On-device storage ranks above server-based apps regardless of the server-based app’s stated policy. Within the on-device category, we ranked by feature breadth, platform availability, and whether the developer has a documented commercial incentive to monetize data.
Flo, Premom, and Spot On are excluded from the main ranking because they are server-based apps with documented data-sharing histories or are funded by organizations with distinct data interests. They appear in the comparison table for context.
Which period tracker apps have been caught selling user data?
Flo Health was subject to FTC enforcement action in 2021 for sharing user health data — including menstrual cycle information — with Facebook and Google SDKs without consent. A combined $59.5M class action settlement was reached in September 2025 (Reuters 2025-09-25). Premom faced FTC enforcement action in 2023 for sharing data with Chinese analytics firms Umeng and Jiguang.
What makes an app provably not selling your data?
On-device storage is the strongest structural guarantee. If your data never reaches the developer's servers, the developer has nothing to sell and no server to subpoena. Apps like Floriva, Euki, and Drip store data locally. Policy promises from server-based apps — even legitimate ones like Clue — depend on trusting the developer and their legal jurisdiction.
Is Clue safe from a data-selling perspective?
Clue has no documented history of selling data, operates under GDPR, and has no advertising business model. That said, Clue is server-based, which means your data exists on their servers and is technically subject to legal requests. It is a meaningfully better choice than Flo, but on-device apps offer a stronger structural guarantee.
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Frequently Asked Questions
Did Flo Health sell period tracking data?
Is there a free period tracker that doesn't sell data?
What is the best period tracker for privacy in the US after Dobbs?
Does Natural Cycles share data with third parties?
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Start Your Free TrialRelated Resources
Flo App Alternative: 7 Period Trackers That Don't Sell Your Data
Looking for a Flo alternative? We document what Flo did with your data and which period trackers store everything on your device instead.
Euki App Alternative: Period Tracking With Cross-Device Sync
Euki stores data on-device with no account required — the strongest privacy guarantee available. But it has no cross-device sync and limited platform support. Floriva adds sync.
Drip Period Tracker Alternative: iOS Support and Cross-Device Sync
Drip (Bloody Health) is free and open source with on-device storage. But it's Android-only. Floriva adds iOS support and cross-device encrypted sync with the same privacy architecture.
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How Femtech Apps Monetize Your Health Data
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Flo Health Pricing: What $4.99/mo Actually Costs You
Flo offers a free tier and a $4.99/mo premium plan. We break down the real tiers, the hidden costs the FTC documented, and how Floriva compares at $2.99/mo.