What Is Euki and What Makes It Different From Other Period Tracker Apps?

Euki is a free period and pregnancy tracking app built on the premise that "tracking your health shouldn't mean being tracked in return." It is gender-inclusive, available in English and Spanish, and combines cycle tracking with reproductive and sexual health education resources. What sets it apart from most period trackers is its privacy model: according to the site, Euki does not collect personal data, has no third-party tracking, and does not sell data or use it for targeted ads. It is an open-source project managed by an independent 501(c)3 nonprofit and funded by community donations rather than paywalls.

What Euki actually is

Euki describes itself as more than a period tracker — a reproductive health tool with two connected parts:

• Tracking: period and pregnancy tracking for anyone who needs it, framed as gender-inclusive rather than women-only.
• Education and resources: inclusive material intended to build confidence about your body and sexual health journey.

The app is available in English and Spanish.

What makes it different

The differentiator is the data model, not the feature list. Most period trackers are free because they monetize usage; Euki's stated approach is to avoid collecting the data in the first place, which removes the need to sell it or target ads with it.

Third-party assessments on the site reinforce the privacy angle. Mozilla's Privacy Not Included is quoted saying it loves Euki "for offering a truly private reproductive health app free of charge," and WIRED is quoted saying five popular period tracking apps "falter when compared with more secure options like Euki." Make Use Of is quoted calling it "one of the few menstrual tracking apps that does not collect any data."

Who runs it and how it stays free

Euki is an open-source project managed by an independent 501(c)3 nonprofit organization. The site states that privacy, freedom of speech and information, and bodily autonomy are treated as human rights rather than paid features, and that donations are tax-deductible. There is also a merch shop that supports the project.

This matters if you care about longevity and incentives: a donation-funded nonprofit has a different reason to exist than an app whose revenue depends on engagement or advertising.

Who it's for

Euki is a reasonable choice if:

• You want period or pregnancy tracking without your data being collected, sold, or used for ad targeting.
• You want a gender-inclusive tool rather than one framed only around women.
• You want reproductive and sexual health education alongside tracking.
• You prefer supporting a nonprofit, open-source project over a commercial app.
• You need English or Spanish.

It may not be the right fit if you want deep integrations with wearables, clinical-grade predictions, or a large ecosystem of connected health devices — the site's emphasis is privacy, inclusivity, and education rather than hardware partnerships.

How to evaluate the privacy claim yourself

The site's claim is specific and checkable, so verify rather than assume:

1. Read Euki's own privacy documentation (the site links to a "Learn how Euki's Privacy features help protect your personal information" section).
2. Because it is open source, you or a technically inclined person can inspect the code rather than trusting a marketing page.
3. Compare against the Mozilla Privacy Not Included reviews referenced on the site, which rate apps on data collection and security.
4. Check the app store listing for the current version, permissions requested, and recent user reviews before installing.

One caveat worth stating plainly: "does not collect data" is the project's own description and the framing of the reviews it cites. If your threat model is strict, confirm it against the source code and privacy policy rather than the homepage alone.