Privacy Review: Euki

This is a rare case where the answer is (mostly) an enthusiastic yes.

Euki’s default setup was squeaky clean in our testing, especially for a health monitoring app. We didn’t see any third-party data collection when using core features like cycle and symptom tracking, and the health data we entered didn’t seem to leave our device.

The only catch comes with (some of) Euki’s educational content. When you open certain resources, Euki switches to an in-app browser. At that point, you’re basically just visiting a regular website, with the usual tracking that comes with it, and we’ll unpack that a bit more below.

For the most part, Euki keeps your data local. You don’t need to create an account to use it, and the health information you enter, like cycle data, symptoms, or notes, stays on your device rather than being stored on external servers.

The one exception is its educational content.

Across the resource hubs we tested, pages about adoption, abortion, miscarriage, STDs, and more, we saw those sites load their own mix of analytics tools and ad trackers, including services from Google, Meta, and Microsoft. These tools are designed to collect information about how a page is used, which sections you read, how long you stayed, what you tapped, and send it back to their own servers.

In a typical browser, they’d also store identifiers that stick around, letting them recognize the same device over time. In Euki’s browser, we saw a fresh one assigned each time. This didn’t stop trackers from seeing what we did on a page, but it did keep them from connecting that visit to whatever we did next. To the trackers, we looked like a newcomer every time we showed up, even on the tenth visit.

The one weak spot we saw was when people entered identifying information like an email address on one of these pages. At that point, some trackers may be able to link that email with your device, effectively unmasking an otherwise anonymous visit. Euki’s co-founder, Ana Ramirez, said Euki’s product team will be taking a look into this.

Outside of that edge case, Euki is about as buttoned up as an app can get.

Post-Roe, tracking anything about your reproductive health became a risky activity seemingly overnight. Search histories, direct messages, location records from the apps you use, all of it can now surface in criminal investigations in states with abortion bans.

This is the world Euki was designed for. In interviews, its founders have been explicit: the app’s design is a direct response to how easily people’s reproductive health data can be used against them. As its founder put it in an interview from last year, Euki was built to be “one step to counteracting digital surveillance of our reproductive health.”

And unlike most other apps that carry the promise of privacy, Euki actually follows through. We definitely aren’t alone in that assessment that the app takes a notably light touch when handling your personal data.

Euki's privacy commitments have stayed consistent: Its Privacy Policy and its separate Consumer Health Data Privacy Policy—both dated to Euki's mid-2024 spinoff into its own nonprofit from Women Help Women—have stayed textually identical through June 2026. No personal data collected, no Consumer Health Data collected, everything stored locally on the device.

We didn’t find anything in our tests to suggest there was anything extra going on behind the app’s minimal setup. Even when we opened external pages in the in-app browser, none of the health information we entered, like cycle data or symptoms, left the app.

Euki’s biggest privacy win is how little it needs from you to function. You can use the app without creating an account, which means there’s no built-in way to tie your activity to an email address or another persistent identifier. It also doesn’t ask for access to personal info like your location, contacts, or anything else stored on your phone, and it avoids features like social sharing or cross-device syncing that would require sending your data elsewhere.

And that’s before you even get to the proactive tools Euki gives users to control what happens to their health information (or what little it collects, anyway). Want your data to delete itself every week? Euki can do that. Want to lock the app behind a PIN? That’s there too. Want a decoy landing page you can pull up if someone’s forcing you to unlock your phone? Of course Euki thought of that already.

Euki expects you to do some of the work here: features like PIN locks, auto-deletion, and decoy screens only work if you enable them first. If you don’t, that data is still accessible to anyone who can unlock your phone.

The catch is that once you do lock the app down, you’re on your own. Because everything you log stays local, there’s no getting back in if you lose your device or forget your PIN code. For some folks, that tradeoff could turn the app from helpful to a headache pretty quickly.

Euki also assumes you’re paying attention when you’re using its browser: an app can limit what websites collect from you, but it can’t protect you from yourself. If you enter your name, email, or phone number into a form during one of those visits, you shouldn’t expect it to stay anonymous for long.

You don’t need to overthink this one.

• Take advantage of Euki’s privacy features. Set a PIN for the app (make it one you’ll actually remember) to keep your data protected, and consider setting your data to clear on a regular schedule so less of it builds up over time.
  
• Don’t be afraid to customize. Euki lets you control what shows up on the home screen, like whether cycle tracking, symptoms, or notes are front and center, so sensitive details aren’t in full view every time you open the app.
  
• Handle the browser with care. If you’re opening third-party sites in Euki’s browser, don’t treat it like an anonymous visit. Use what you need and move on, avoid clicking around, and be careful about what you enter into forms. The app makes it harder for trackers to follow you across sites, but it won’t stop what a single site can track during a given visit. The more you interact, the easier you are to identify.

In most apps, privacy ends up being your problem. Read the policies, submit data deletion requests over and over, the kind of labor that’s become the unwritten cost of owning a smartphone. Euki proves it doesn’t have to be.

It’s a fully functional period tracker that sidesteps most of the usual privacy issues, not by pushing the hard work onto you, but by not collecting that much data in the first place. No elaborate settings to tweak. No tradeoffs to navigate. There’s nothing to leak, so nothing does.

Privacy shouldn’t hinge on you being more careful, or on learning how to outsmart a system that was never designed with you in mind. For most people, that kind of constant awareness just isn’t realistic; you’re using an app while half-distracted, or tired, or just trying to get through your day. Most privacy advice assumes you have more bandwidth than that.

Euki is a reminder that companies can make different choices, and when they do, the whole experience feels more like it should. Not because you did everything right, but because you didn’t have to.