Best Period Tracker Apps That Don’t Sell Your Data in 2026
Period tracker apps collect some of the most sensitive information on your phone — not just when you bleed, but whether you’re having sex, trying to conceive, or have had a miscarriage. Consumer Reports’ Digital Lab has evaluated exactly this question and found that most cloud-based trackers provide no real guarantee that this data won’t be shared with third parties. Since the Dobbs decision, that’s stopped being a purely theoretical privacy concern for a lot of people and become a practical one: cycle data has already turned up in legal proceedings, and several popular apps have faced FTC action or investigative reporting over undisclosed data sharing.
The good news is that privacy-respecting options exist, and you don’t have to choose between tracking your cycle and protecting your data. This guide compares seven period tracker apps that don’t sell your data, each evaluated on how they actually handle information rather than just what their marketing claims. They’re listed alphabetically, with honest pros and cons for each, because “most private” and “most useful” aren’t always the same app.
Why Period Tracker Privacy Matters
Most period tracker apps aren’t covered by HIPAA, the law many people assume protects health data, because HIPAA only applies to healthcare providers, insurers, and their direct partners — not consumer apps. That leaves period tracking data governed mostly by each company’s own privacy policy, which can change, get sold in an acquisition, or simply not be enforced. A 2022 Washington Post investigation found Stardust, an app that marketed itself as privacy-first after Dobbs, was sharing user data with a third-party analytics company. Flo, the largest period tracker, settled with the FTC in 2021 over sharing health data with Facebook and Google despite promising not to.
The practical risk isn’t hypothetical: on-device data generates no server-side record that can be subpoenaed, while cloud-stored data can be. That single distinction — local storage versus server storage — is the biggest factor separating genuinely private period tracker apps from ones that just say the right things in their app store listing.
How We Compared These Apps
We evaluated each period tracker app that doesn’t sell data on:
- Where data is stored — on your device only, or on company servers
- Account requirements — can you use it without creating a login?
- Third-party tracking — does the app use ad or analytics SDKs that transmit your data elsewhere?
- Transparency — has the company published privacy reports, been independently audited, or faced any data-sharing controversies?
- Deletion controls — can you fully and immediately delete your data?
Comparison Table
Here’s how these seven period tracker apps that don’t sell your data compare at a glance:
| App | Best For | Data Storage | Account Required | Price |
|---|---|---|---|---|
| Apple Health (Cycle Tracking) | iPhone users wanting a built-in option | On-device by default | No | Free |
| Clue | Science-backed tracking with GDPR protection | Server-based (Berlin, EU) | Yes | Free; Clue Plus ~$40–50/yr |
| Cora | PCOS tracking with no ads or data sales | Encrypted server storage | Yes | Free; Cora Plus $49/yr or $19.99/mo |
| Drip | Open-source, on-device tracking | On-device only | No | Free |
| Euki | Nonprofit, privacy-first reproductive health app | On-device only | No | Free |
| Natural Cycles | FDA-cleared fertility tracking | Server-based, no documented data-selling | Yes | Subscription-based |
| Periodical | No cloud storage, no third-party tracking | On-device only | No | Free |
Apps listed alphabetically, not by ranking.
The Apps, One by One
A closer look at each of these period tracker apps that don’t sell your data, including where each one is strongest and where it falls short.
Apple Health (Cycle Tracking)
If you’re already on an iPhone, Apple’s built-in Cycle Tracking feature inside the Health app is worth considering before downloading a third-party tracker at all. Data stays on your device (and in iCloud if you sync it, which is end-to-end encrypted) rather than going to a separate company’s servers.
Pros:
- No separate account or app download required if you already use an iPhone
- Data stored on-device and encrypted if synced to iCloud, not sent to a third-party company
- No ads, subscriptions, or third-party analytics SDKs
Cons:
- Fewer symptom-tracking and community features than dedicated period tracker apps
- iOS only, so it’s not an option for Android users
- Predictions are more basic than apps built specifically around cycle forecasting
Clue
Clue is based in Berlin and operates under the EU’s GDPR, one of the stricter data protection frameworks in the world. The company has published transparency reports and been public about not selling user data, and it partners with academic institutions like Oxford and Stanford using anonymized, aggregated data rather than individual records.
Pros:
- Strong regulatory backing (GDPR) and a public track record of transparency reporting
- No documented history of selling or improperly sharing user data
- Clue Plus removes ads and sponsored content entirely
Cons:
- Data is stored on Clue’s servers rather than on-device, which is a meaningfully weaker privacy guarantee than local-only apps
- The free version uses third-party analytics tools and may show sponsored content
- Requires an account to use
Cora
Cora is built specifically for PCOS tracking, and its privacy stance is part of the core pitch: no ads, no data sold, and encrypted storage for the health and cycle data you log. Because Cora combines cycle tracking with symptom, food, and treatment logging in one place, it’s collecting more data than a bare-bones period tracker — which makes its no-ads, no-data-sale policy more consequential than it would be for a simpler app.
Pros:
- Explicit no-ads, no-data-sold policy alongside encrypted storage
- Doctor-ready data export puts you in control of who sees your information and when
- Single pricing tier means no feature-gating that might otherwise incentivize more invasive data use
Cons:
- Data is stored on Cora’s servers rather than purely on-device, so it doesn’t offer the same subpoena-resistant guarantee as fully local apps like Drip or Euki
- iOS only at the time of writing
- No independent third-party privacy audit publicly available yet, unlike Clue’s published transparency reports
Drip
Drip is a free, open-source period tracker for Android, originally developed with backing connected to Mozilla’s privacy advocacy work. Because it’s open source, its code can be independently reviewed rather than just trusted on the word of a privacy policy.
Pros:
- Fully on-device storage with no account required
- Open-source code allows independent verification of its privacy claims
- No ads or third-party tracking SDKs
Cons:
- Android only, so iPhone users can’t use it
- Minimal feature set — no predictions, AI insights, or community features
- Smaller development team means slower feature updates than commercial trackers
Euki
Euki is a free, nonprofit period tracker built by Women Help Women, a reproductive rights organization, specifically to avoid the surveillance risks common in commercial period trackers. It collects no personal information at all, stores everything locally, and includes features like a decoy PIN screen for situations where someone is forced to open the app.
Pros:
- Doesn’t collect any personal information — nothing to sell, share, or leak in the first place
- Extra security features like PIN protection and a false decoy screen
- Includes broader reproductive health information (contraception, abortion access, STIs) beyond period tracking, which can be useful on its own
Cons:
- As a nonprofit tool rather than a healthcare provider, Euki itself isn’t subject to HIPAA, and its linked outside resources have their own separate privacy policies
- Simpler cycle prediction than commercial apps with larger data science teams
- Renaming the app icon on your home screen requires a separate third-party tool, which is a minor inconvenience for anyone wanting extra discretion
Natural Cycles
Natural Cycles is the first FDA-cleared birth control app, using temperature data to calculate fertility status. Its regulatory clearance means it faces a level of accountability that unregulated period trackers don’t, and there’s no documented history of it selling user data.
Pros:
- FDA clearance adds a layer of regulatory accountability beyond app store policy alone
- No documented data-selling controversies
- Works with wearables (Oura, Apple Watch) for passive tracking rather than manual daily entry
Cons:
- Server-based storage, so it doesn’t offer the subpoena-resistant guarantee of on-device apps like Drip or Euki
- Requires an account and ongoing subscription
- Primarily built around fertility/contraception use cases rather than general symptom tracking
Periodical
Periodical is a free, privacy-focused period tracker that stores data locally and doesn’t use third-party tracking. It was one of only three apps Consumer Reports’ Digital Lab recommended in its evaluation of period tracker privacy practices, alongside Drip and Euki.
Pros:
- On-device storage with no cloud dependency and no account required
- Independently reviewed favorably by Consumer Reports’ Digital Lab
- No third-party analytics or advertising trackers
Cons:
- Smaller user base and less brand recognition than mainstream commercial trackers
- Feature set is more basic than data-hungry commercial apps offering AI predictions or community features
- Like other on-device apps, switching phones without a manual backup can mean losing your history
Which Period Tracker App That Doesn’t Sell Your Data Should You Use?
- If you want the strongest possible privacy guarantee, Drip, Euki, and Periodical are the three apps here that store data entirely on your device and require no account — Consumer Reports’ own testing landed on the same three.
- If you’re already an iPhone user and want the simplest option, Apple’s built-in Cycle Tracking avoids a third-party app entirely.
- If you have PCOS and want cycle, symptom, and food tracking together without ads or data sales, Cora combines that broader tracking with a no-ads, no-data-sold policy, though it stores data on its servers rather than purely on-device.
- If you want science-backed predictions with strong regulatory backing, Clue’s GDPR compliance and transparency reporting make it a reasonable server-based choice, even though it isn’t fully on-device.
- If contraception or conception planning is your main goal, Natural Cycles’ FDA clearance adds accountability that most period trackers don’t have.
No app is perfectly risk-free — even fully on-device apps depend on your phone’s own security — but the difference between an app that stores nothing on a server and one that does is the single biggest lever you have. Read the current privacy policy before entering sensitive information, since practices can change after an app is acquired or updated.
FAQ
Which period tracker apps don’t sell your data? Drip, Euki, and Periodical store data entirely on-device and have no documented history of sharing or selling it, which is why Consumer Reports’ Digital Lab recommended all three. Clue, Cora, and Natural Cycles also have no documented data-selling history, though they store data on company servers rather than purely on your device.
Is Flo safe to use for period tracking? Flo settled with the FTC in 2021 over sharing health data with Facebook and Google despite telling users it wouldn’t, and it faced related class-action lawsuits afterward. The company has since made privacy commitments and undergone audits, but its history is worth knowing if data-sharing history factors into your decision.
Why does on-device storage matter more than a “we don’t sell data” promise? A privacy policy can change, and a company can be acquired by one that doesn’t honor the same commitments. Data stored only on your device was never transmitted anywhere in the first place, so there’s nothing on a server to be subpoenaed, breached, or sold later — that’s a structurally stronger guarantee than a policy promise.
Are period tracker apps covered by HIPAA? No, in most cases. HIPAA covers healthcare providers, insurers, and related entities — not consumer apps like period trackers. That’s part of why the on-device versus server-storage distinction matters so much: without HIPAA, you’re relying on the company’s own privacy policy and its actual practices, not a legal floor.
Is it safer to delete period tracker apps entirely after Dobbs? Some privacy advocates recommend it, especially for anyone in a state with restrictive reproductive health laws who is at meaningfully elevated risk. For most people, switching to an on-device app like Drip, Euki, or Periodical — or using Apple’s built-in Cycle Tracking — offers a middle ground: you keep the tracking without creating a server-side record.
Does Cora sell or share user data? No. Cora states it doesn’t run ads or sell data, and stores health information with encryption. Its data is stored on Cora’s servers rather than purely on-device, so it’s not in the same category as fully local apps like Drip or Euki, but its stated policy is against data sales or ad-based monetization.
How do I find period tracker apps that don’t sell your data? Check whether the app stores data on-device versus on a server, whether it requires an account, whether it uses third-party ad or analytics SDKs, and whether the company has any documented history of data sharing or FTC action. The apps in this guide — Apple’s Cycle Tracking, Clue, Cora, Drip, Euki, Natural Cycles, and Periodical — were chosen specifically because none have a documented history of selling user data.
What should I check before trusting any period tracker with my data? Look at where data is stored (on-device is strongest), whether an account is required, whether the app uses third-party ad or analytics SDKs, and whether the company has any documented history of data sharing or FTC action. Policies change, so it’s worth re-checking an app’s current privacy policy periodically rather than assuming it’s unchanged from when you first downloaded it.
Can period tracker data really be subpoenaed? Yes, in principle — any data stored on a company’s servers can potentially be obtained through legal process, including a subpoena or warrant, depending on jurisdiction and the specific legal request. This is the central reason privacy researchers point to on-device storage as a stronger protection than a company’s data-sharing promises alone.
