TideBook

Most cycle apps for men show you the same textbook average. TideBook starts there — then learns from what actually happens in your relationship, and adjusts. One tap a day. Nothing leaves your phone.

HOW IT WORKS
• Enter the date her last period started — that's the whole setup
• Each day, answer one question with a single tap
• TideBook learns your couple's real pattern and replaces the textbook average with it

WHAT YOU SEE
• Today: where she is in her cycle, what that phase usually means, and how today looks
• The next fourteen days at a glance, so you can plan
• The full cycle view: the textbook curve, your predicted curve, and every day you logged
• Next period estimate, updated from your own recorded cycles

THE DIFFERENCE
The confidence line in the app — Textbook average → Learning → Tuned to your pattern — is the whole point. Every other app in this category shows the same generic curve forever. TideBook moves off it as soon as it has enough of your data.

PRIVATE BY DESIGN
Everything stays on your phone. No account, no cloud, no analytics, no data collection of any kind. We have no servers, so there is nothing for us to see, sell, or lose.

TideBook is not a medical device and not a contraceptive method. Predictions are estimates, and cycles vary widely.