달나, a quiet forecast for your cycle

Why it surfaced

달나 asks for only an email address and the date of the last period, then sends just 4–6 forecasts per cycle rather than daily reminders. Its small interaction loop is unusually considerate: when a new period begins, one button in the email resets the forecast, and unsubscribing deletes the data immediately.

A Korean-language email tool that forecasts shifts in energy, mood, focus, and physical condition across the menstrual cycle.