Phasa: Period Tracker Calendar

Most period apps hand you one confident date. Bodies don't work that way. Phasa shows the days your period is likely to start, and that range tightens as it learns your rhythm — or stays wide, honestly, when your cycle is irregular. HOW PHASA READS YOUR CYCLE • Looks at your recent cycles, sets aside the odd month out, and leans on the most recent ones • Shows a prediction window plus a confidence level that says what it's based on • Log basal body temperature and Phasa looks for the sustained rise after ovulation, then learns the length of your own luteal phase instead of assuming 14 days • Fertile window and phase for every day of your cycle PATTERNS WITH THE EVIDENCE ATTACHED When Phasa spots something in your logs — headaches clustering before your period, low energy after short sleep — it tells you how many cycles that observation rests on. You decide how much it means. LOG IN…