listicles
Published by Floriva · Updated 2026-03-21 · How Floriva checks its guides
Best Period Tracker Apps That Don't Sell Your Data (2026)
Five period tracker apps with no documented history of selling reproductive health data. Ranked by privacy architecture, not just policy promises.
Floriva and Euki are the strongest picks if your priority is provable data non-selling, both store data on-device so there is less company-held data 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.
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 is documented and consequential.
The most meaningful difference is architectural. Apps that store data on-device cannot sell what they do not have. Apps that store data on servers can share that data, and in some cases have, regardless of their stated policies.
For reproductive health data specifically, the post-Dobbs legal environment adds another dimension. Law enforcement in states with abortion bans has sought health app records in investigations. On-device storage eliminates that exposure because there are less readable server-side data 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.
Cited signals
- Flo Health paid a $59.5M combined settlement for sharing reproductive health data without user consent Reuters / FTC, September 2025
- Floriva is a paid app with no free tier, structural data-selling prevention through on-device architecture Floriva pricing
Period Tracker App Data-Selling Comparison
| App | Data Sold | On-Device Storage | Platform | Price |
|---|---|---|---|---|
| Floriva | No | Yes | iOS + Android | Paid app (no free tier) |
| 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 |
How the options compare, at a glance.
-
Floriva
Paid app (no free tier)
On-device storage, no account required, encrypted cross-device sync available. No documented data-sharing history. iOS and Android.
Best overall for data privacy. Local-first architecture reduces readable company-side data, so the privacy model is architectural and not only policy-based.
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 subscription required (no free tier)
- Newer product, smaller prediction dataset than Flo or Clue
-
Euki
Free
Built by Ibis Reproductive Health (nonprofit). On-device storage, no data collection, no accounts. iOS and Android. Free.
Best free option. Nonprofit structure removes the business model pressure that led Flo and Premom to share data in the first place.
Pros
- Nonprofit developer with no commercial incentive to monetize data
- On-device storage, core records stay on 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
-
Drip
Free
Open source Android app. No accounts, no data collection, no analytics SDKs in the codebase. Source code publicly auditable.
Best for Android users who want code-level verification of privacy claims. Open source removes the need to trust developer promises.
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
-
Clue
Free tier / $9.99/mo premium
Berlin-based, GDPR-compliant, no ads. Server-based storage. No documented FTC enforcement actions or data-selling history.
Best server-based option. GDPR compliance and no-ads model are meaningful, but on-device storage is a stronger privacy guarantee than any policy.
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
-
Natural Cycles
$12.99/mo or $99.99/yr
FDA De Novo clearance for contraception (2018). No documented data-selling history. Server-based, requires account.
Acceptable for contraception tracking specifically. The FDA clearance signals accountability but doesn't address server-side data exposure.
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
Quick answers to the obvious questions.
Which period tracker apps have been caught selling user data?
Flo Health faced 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 less company-held data to sell and no server to subpoena. 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. Your data exists on their servers and is subject to legal requests. It is a meaningfully better choice than Flo, but on-device apps offer a stronger structural guarantee.
Which period trackers don't sell data?
Euki (nonprofit), Drip (open source), and Floriva (paid, no ads) have no commercial data incentive. A quick check: open the privacy policy and search for 'advertising partners' or 'analytics providers' receiving reproductive health data. Cloud apps with no such clauses are rare. On-device apps do not need such clauses because no data leaves the phone.
How do I verify a period tracker doesn't sell my data?
Three checks: (1) read the privacy policy's data sharing section for named advertising or analytics partners, (2) look at the app's SDK list, tools like Exodus Privacy scan Android apps and show which trackers are embedded, (3) check enforcement history, the FTC cases on Flo (2021) and Premom (2023) reveal conduct that policies did not.
Questions people ask before they switch.
Did Flo Health sell period tracking data?
The FTC found that Flo shared sensitive user health data with Facebook and Google despite promising privacy. The FTC took enforcement action against Flo in 2021. A combined $59.5M class action settlement was reached in September 2025 (Reuters 2025-09-25).
Is there a free period tracker that doesn't sell data?
Yes. Euki is free, on-device, and built by a nonprofit with no commercial data incentive. Drip is also free and open source for Android users. The Clue free tier has no ads and no documented data-selling history.
What is the best period tracker for privacy in the US after Dobbs?
On-device trackers are the most legally protective after Dobbs because they generate no readable server-side records that can be requested. Floriva and Euki both use on-device storage. Law enforcement in states with abortion bans has sought health app data in investigations, which makes this a concrete concern.
Does Natural Cycles share data with third parties?
Natural Cycles has no documented FTC enforcement actions or confirmed data-selling. The company's FDA clearance for contraception imposes regulatory accountability, but that clearance covers efficacy, not data handling. Natural Cycles is server-based, so data exists on their servers.