Founded by Isabella Zhang and Joyce Guo
An app that tracks the whole monthly hormonal cycle rather than just the period, and lets a woman share where she is in it with a partner or a close friend.
Updated September 2026.
Most cycle apps log bleeding and predict the next one. KNOWN gives a daily read across all four phases, and adds a social layer so the people around you understand what the week looks like without being told each time.
Women who want to understand their own cycle, and the people they choose to share it with.
The founders' own shorthand is Strava for your period. It's built with a science advisory board of OB-GYNs, a physical therapist, a dietitian and a neuroscientist, and it reads from Apple Watch, WHOOP and Oura.
Contributions go into the fund that writes them. If KNOWN exits one day, our share comes back to the fund and goes out again, which is what makes us an evergreen fund.
Handles the credentialing a clinician needs before they can legally treat patients and bill insurance.
Makes Opal, a screen by the sink that coaches proper hand washing and records how long it takes.
Manages when electric cars charge, so owners skip a costly panel upgrade and utilities keep the local grid steady.
Updates on the founders we back and the work behind the checks.
