What is the safest period tracker app in 2026?

On-device trackers are structurally safest because they never transmit data to a server. Among on-device options, Floriva offers the most features with cross-device encrypted sync on iOS and Android. Euki is the best free option. Drip is best for Android users who want open-source transparency.

Which period tracker apps have been investigated by the FTC?

Two period and fertility trackers have faced FTC enforcement action: Flo Health (2021, for sharing reproductive data with Facebook and Google; $59.5M combined settlement in 2025) and Premom (2023, for sharing health data with third-party analytics firms including Chinese companies). Both are server-based apps.

Do I need to pay for a private period tracker?

No. Euki (on-device, nonprofit) and Drip (on-device, open source, Android only) are both free. Floriva costs $5.99/mo but adds cross-device encrypted sync and a fuller feature set. Among server-based apps, Clue offers a free tier under GDPR protections.

Can period tracker data be used against me in court?

Data stored on a company's server can be obtained via subpoena or court order. In states with abortion restrictions, this is a documented risk. The FTC's 2024 research paper found that period tracking app data practices can be used to detect pregnancy and abortion. On-device trackers eliminate this risk because no server-side copy exists.

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Best Period Tracker Apps in 2026

8 period trackers ranked by privacy architecture, features, and price. On-device, server-based, and open source options compared.

How to Evaluate a Period Tracker Where your data lives matters more than feature count. There are two architectures: on device (data stays on your phone) and server based (data is stored on the company's servers). That difference determines whether your reproductive health data can be shared, breached, or subpoenaed. The FTC took enforcement action against Flo (2021) and Premom (2023). Both were server based apps that shared data with third parties. On device storage cannot be shared because no company server holds a copy. Source: FTC vs. Flo, January 2021; FTC vs. Premom, May 2023 The Ranking Criteria This list ranks apps by: 1. Data architecture , on device vs. server based 2. Enforcement history , documented regulatory actions or settlements 3. Transparency , open source, published architecture, third party audits 4. Features , cycle prediction, symptom tracking, sync, platform support 5. Pricing , what you pay and what's behind a paywall Privacy architecture carries the most weight. A feature rich app that stores data on servers you do not control still creates subpoenable records. On Device Apps On device trackers store data on your phone. No company server holds a copy. That