PrivateCycle
A privacy-first menstrual and cycle tracker that stores everything on-device, requires no account, and ships with a decoy PIN mode — built for users in regions where reproductive health data has legal risk.
women and people who menstruate who want cycle tracking without trusting a startup with their data
- On-device storage only: no servers, no accounts, no analytics SDKs in the app binary
- Decoy PIN that opens a fake, plausible-looking blank cycle when entered under coercion
- Encrypted local backup the user controls (their iCloud, their export file) — never a vendor cloud
- Privacy-policy scorecard inside the app: shows what each feature does and does not transmit, in plain language
Mozilla's report and the BBC story show major period trackers still ship data to Google, Meta, TikTok and obscure ad networks; in the post-Dobbs US and similar regimes, that data can end up in criminal cases
Sustained coverage from BBC, EDRi, Fordham Law Review, and a fresh 2025 Bureau of Investigative Journalism story on Meta's illegal collection via Flo; the HN thread with 59 points and 34 comments reflects a real, engaged audience worried about post-Dobbs data exposure.Period trackers 'coercing' women into sharing risky information ↗Meta 'eavesdropping' on Flo exposes how period apps are a data… ↗
Market is already crowded with explicitly privacy-first period trackers: Vela, Lunara, Bloom, PeriodTools, and — most damagingly — a product already called PrivaCycle (privacycle.io) shipping the same on-device/no-account pitch; Rescripted and AllAboutCookies both curate lists of 7-8 such apps.Vela — Privacy-First Period Tracking ↗PrivaCycle — The Period Tracker That Can't Spy On You ↗Private period tracker with no account and no tracking ↗
Most privacy-first competitors ship free (Lunara, Bloom, PeriodTools all explicitly 'free, no account'), and paid femtech subs have already been commoditized by Flo/Clue; willingness to pay extra purely for privacy — versus features like predictions or coaching — is unproven.Free Period Tracker — Private, No Account, Nothing Sold ↗Free Period Tracker Online | Private, No Account | Bloom ↗
Structural, not trend-driven: post-Dobbs criminalization, HIPAA not covering lifestyle apps, ongoing FTC enforcement, and the 2025 Meta/Flo ruling show the threat persists across regulatory cycles; privacy is a permanent feature, not a fad.Period Tracking Apps and Reproductive Privacy in the Post-Dobbs Era ↗All Eyes on my Period? Period tracking apps and the future of privacy in a post-roe world ↗
The pattern is proven and already shipped by multiple indie iOS teams (local-only storage, decoy PIN is a well-known pattern from photo-vault apps); main risk is differentiation and the fact that the exact name 'PrivaCycle' is already taken on a live product.PrivaCycle — The Period Tracker That Can't Spy On You ↗The Best Period Tracking Apps for Data Privacy in 2026 ↗