The best private period trackers in 2026 — an honest look at what’s out there.

Since the overturning of Roe v. Wade and Flo’s FTC settlement, the phrase “your data is safe with us” has become standard marketing copy. But marketing copy and engineering architecture are different things. What an app promises in its privacy policy and what it does with your data at the code level can be worlds apart.

So we looked at the apps that are most often recommended for privacy-conscious tracking. Not the ones with the biggest marketing budgets — the ones that privacy advocates, researchers, and organisations like Consumer Reports and the Electronic Frontier Foundation actually point people toward. And we included a couple of mainstream options that have tried to address their privacy problems, because ignoring them wouldn’t be honest.

Here’s what we found.

Drip

Drip is open-source, built by volunteers, and stores everything on your device. Consumer Reports reviewed it favourably for its privacy practices — no third-party trackers, no cloud storage, no data collection. If you care about verifiable transparency, the fact that anyone can inspect the source code is meaningful.

The trade-offs are real, though. Drip is Android-only, which immediately rules it out for a large portion of the market. The interface is functional but minimal — it does what it says, but it doesn’t make you want to open it every morning. There’s no team behind it building new features or maintaining it long-term, which is a consideration if you’re planning to track for years.

Best for: Android users who prioritise open-source transparency above everything else.

Euki

Euki was built by the International Planned Parenthood Foundation with safety as the central design goal. Data stays on your device. There’s a quick-delete feature that wipes everything — useful in situations where someone might check your phone. It also includes a “fake screen” that can display different content if the app is opened by someone else.

These safety features are genuinely important for women in vulnerable situations, and no other app offers them. The tracking itself is straightforward and covers the basics without overwhelming you.

Where it falls short is in the details that make daily tracking a habit. The predictions are basic. The interface hasn’t been updated in a while. And like Drip, the long-term sustainability of a nonprofit-built app is an open question.

Best for: Women in situations where physical safety and quick data deletion are priorities.

Periodical

Periodical takes minimalism to its logical conclusion. It’s open-source, stores data locally, and does exactly two things: tracks your period and predicts the next one. No symptoms, no mood, no notes, no insights. If you want a digital replacement for marking dates on a paper calendar, this is it.

The privacy is strong simply because there’s so little data involved. But for anyone who wants to understand their cycle — not just know when it’s coming — Periodical is too bare-bones to be useful as a primary tracker.

There are also signs that the project may not be actively maintained. The domain appears to have been listed for sale at various points, which doesn’t inspire confidence in long-term availability.

Best for: People who want the absolute minimum digital footprint and nothing more.

Stardust

Stardust markets itself heavily on privacy and gained a surge of downloads after the Dobbs decision. The branding is polished, the interface is appealing, and the messaging around data protection is front and centre.

However, a Vice investigation found that Stardust could share user data with law enforcement under certain circumstances, contradicting the impression created by its marketing. The app’s privacy story is more nuanced than it appears on the surface.

This is a useful reminder that design quality and privacy messaging don’t automatically mean the underlying architecture is protecting you. Reading the actual privacy policy — not just the marketing page — matters.

Best for: Users who want an attractive interface and are comfortable with the nuances of its privacy position after reviewing the policy themselves.

Flo (Anonymous Mode)

Flo is the most downloaded period tracker in the world. It’s also the one that settled with the FTC for sharing user data with Facebook and Google. That settlement is now five years old, and Flo has since introduced Anonymous Mode — which lets you use the app without providing your name or email.

Anonymous Mode is a step forward. But it’s an opt-in layer on top of an architecture that was built to collect and transmit data. The app still functions primarily through cloud storage. Your cycle data still lives on Flo’s servers. Anonymous Mode means it’s not tied to your name, but it’s still tied to your device, and it’s still accessible to the company.

For users who are already invested in Flo’s ecosystem and don’t want to switch, Anonymous Mode reduces some risk. But it doesn’t change the fundamental architecture of how the app handles your information. If you’re ready to move on, our guide to switching from Flo covers what to check before you go.

Best for: Existing Flo users who want to reduce their exposure without starting over elsewhere.

Clue

Clue is EU-based, GDPR-compliant, and has a stronger privacy reputation than Flo. It doesn’t use your data for advertising, and its privacy policy is more straightforward. For many years, it was the default recommendation for privacy-conscious tracking.

That reputation took a hit when a 2022 report found that Clue device data was available on a commercial data marketplace called Narrative. Clue disputed the characterisation, but the finding raised legitimate questions about what happens to metadata even when the app maker’s intentions are good.

The bigger frustration for most Clue users isn’t privacy — it’s the subscription model. Features that were previously free have moved behind Clue Plus, and the upselling has become more aggressive over time. If you’ve read our thoughts on looking for a Clue alternative, this will sound familiar.

Best for: Users who value science-backed tracking and are comfortable with EU-based cloud storage and a paid subscription for full features.

Embody

Embody positions itself as a privacy-by-default tracker with local storage, on-device encryption, and an open-source codebase. The philosophy is sound and the values are clear. A 2026 review highlighted it as one of the better options for users who want a community-supported, education-forward approach to tracking.

The concern is practical. At various points, the website has shown DNS errors, and the app’s long-term availability is uncertain. For anyone choosing a tracker they plan to use for years, the stability of the team behind it matters as much as the privacy architecture.

Best for: Users drawn to the body literacy approach and community ethos, who are comfortable with the uncertainty of a smaller project.

28X

28X is the newest entry on this list, launched in February 2026 by Amber Vodegel — who previously built Pregnancy+, an app that reached 150 million downloads before being acquired by Philips. The pedigree is real.

The privacy architecture matches what privacy advocates recommend: nothing leaves your phone, no external servers, no sign-up needed. The design is polished and thoughtful — a butterfly-based UI designed to remove the stigma of opening a period tracker in public. It covers cycle tracking, symptom logging, mood tracking, and educational content across life stages from first periods to menopause.

Where it raises questions is sustainability. 28X is funded by £1.2 million in philanthropic funding from the Philips Foundation and angel investors. The app is completely free — no subscriptions, no paywalls, no premium tier. That’s admirable, but it’s also the same model that has left other privacy-first trackers (Drip, Euki, Periodical) struggling to maintain development and marketing over the long term. When philanthropic funding runs out, the question becomes whether a free app with no revenue can continue to evolve.

Feature-wise, 28X covers the basics well but doesn’t yet offer the deeper analysis tools — pattern insights, cycle forecasting, GP health reports, or partner sharing — that help users move beyond tracking into understanding. It’s early days, and that may change.

Best for: Users who want a beautifully designed, free, local-first tracker from an experienced founder, and who are comfortable with the long-term sustainability questions of a philanthropy-funded model.

Ferne

We built Ferne because we went through this same list and kept finding the same gap. The apps that take privacy seriously have basic interfaces, no business model, and uncertain futures. The apps with polished experiences and sustainable businesses have privacy architectures that don’t match their marketing.

Ferne keeps all health data on your phone. No email, no login, no sign-up screen. The app works the moment you open it. Symptom tracking, mood, energy, notes, calendar, predictions, and data export are all free. You can import your history from Flo or Clue so you don’t start from zero.

Premium adds deeper pattern analysis, extended forecasting, a GP health report, partner sharing, and encrypted cloud sync — where “encrypted” means end-to-end, on your device, before anything is transmitted. Even the sync feature is built so that the data on our server is unreadable to us.

We’re also building with specific use cases in mind — like tracking how your cycle affects ADHD symptoms, or the daily charting PMDD diagnosis requires, both of which most trackers ignore entirely.

We know we’re biased. We built it. So rather than asking you to take our word for it, we’d suggest the same thing we’d suggest for any app on this list: read the privacy policy, check where your data is stored, and decide for yourself whether the architecture matches the promises. That’s what privacy-conscious tracking actually looks like.

What to look for in any private period tracker

Wherever you land, here are the questions worth asking before you commit.

Does the app require an account? If it needs your email before you can log a single day, ask what that email is for. We’ve written about why this matters in more detail.

Where is your data stored? “On your device” and “in the cloud” are fundamentally different architectures with fundamentally different risk profiles. If data is stored in the cloud, is it end-to-end encrypted? Can the company read it? For a deeper look at the technical differences, see our guide on what happens to your period data.

Does the app use third-party trackers? Even apps with local storage can still ping analytics services when you open them. Consumer Reports specifically tested for this in their evaluation of privacy-focused trackers.

Can you export and delete your data? If the app makes it easy to leave, that tells you something about the relationship it wants with you.

Is the business model transparent? If the app is free and there are no ads, how does it make money? If the answer involves your data, you have your answer about privacy too.

Does it handle irregular cycles honestly? If you have a condition like PCOS, the tracker's prediction model matters as much as its privacy model. An app that forces a single predicted date when your cycles vary by 30 days is not being straight with you. We looked at this problem in detail in our piece on PCOS and cycle tracking.