Head-to-Head Privacy Comparisons

Clue, Flo, and Glow all require accounts and server-side storage. Flo has the worst enforcement record. Here's what each app actually does with your reproductive health data.

Drip is Android-only, open source, and fully on-device. Clue is cross-platform, GDPR-compliant, and stores data server-side. Here's what that means for your privacy.

Euki is free, on-device, and requires no account. Clue is GDPR-compliant and feature-rich but stores data server-side. Here's what that difference means in practice.

Euki and Drip are both privacy-focused free apps with on-device storage. Euki is feature-rich and cross-platform. Drip is open source but Android-only. Here's how they differ.

Flo settled a $59.5M class action for selling your data. Clue is GDPR-compliant but still stores everything server-side. Here's what the difference means for your privacy.

Flo settled a $59.5M class action for selling reproductive health data. Stardust uses an astrology angle but relies on the same policy-based privacy. Here's the comparison.

Flo settled a $59.5M class action for sharing your reproductive health data. Euki is free, on-device, and backed by a nonprofit. Here's how they compare.

Natural Cycles is FDA-cleared birth control at $12.99/mo. Flo settled a $59.5M class action for selling your data. Here's how they compare on privacy, accuracy, and cost.

Natural Cycles is FDA-cleared birth control at $12.99/mo. Glow sold user data to insurers and advertisers. Here's how they compare on privacy, fertility tracking, and cost.

Natural Cycles is FDA-cleared contraception at $12.99/mo. Clue is a GDPR-compliant consumer tracker with a free tier. Both require accounts and server storage. Here's the full comparison.

We ranked 10 period tracker apps from worst to best privacy based on data architecture, enforcement history, and legal subpoena risk. Here's the full breakdown.