Apps & privacy
Choosing a tracker, what happens to your data, and how accurate apps really are. 5 articles, sources listed on every one.
In short: These guides help you choose a period tracker: which are genuinely free, which work without an account, how private your data is, how accurate app predictions are, and how to share your cycle with a partner safely. We make Splash, so we disclose that and source every claim about other apps.
The basics
Free period trackers with no paywall (2026)Which apps are actually free, which hide the useful bits behind a subscription, and how to check for yourself.6 min readPeriod tracker without an account: how it worksWhy “no sign-up” is the simplest privacy setting there is, and what you give up.5 min readHow to share your cycle with a partner (safely)What to share, what to keep, and the settings that keep it your choice.5 min read
Deep dives
Period apps and privacy: what happens to your dataWhere cycle data goes, what has gone wrong before, and the questions worth asking any app.7 min read · Deep diveHow accurate are period tracker apps?What the research says, why predictions drift, and how to read your app’s estimates.6 min read · Deep dive
Read it, then track it.
Splash keeps these articles offline in the app, right next to your own cycle. Free, no account.