Pemsi: Period & Cycle Tracker

NEW: daily moon-phase calendar in 8 phases, drawn from astronomy. Plus AI Coach — ask why today feels off, get answers from your last 30 days of data.

Pemsi is a calm, evidence-based period tracker and cycle calendar built around how you actually feel through the month — not just the days bleeding starts.

PERSONALISED PREDICTIONS • Calibrated cycle predictions that learn from your history — a Bayesian blend of your real data with population baselines, not just "average ± a guess". • Ovulation and fertility window detection that respects OPK tests, cervical mucus and BBT signals when you log them. • 6-month forecast (Pemsi Pro) so you can plan trips, deadlines and life around your cycle.

SYMPTOM & MOOD JOURNAL • 30+ tracked patterns: fatigue, cramps, mood, sleep, anxiety, focus, libido, cravings and more. • 20-second daily check-in that remembers what helped past cycles. • Apple Health sync (Pemsi Pro) — your data flows both ways, your way.

CALENDAR WITH LUNAR CONTEXT • Monthly swipe navigation, predicted vs confirmed period days with soft pastel PMS / fertility / ovulation overlays. • NEW: a daily moon-phase badge on every day — all 8 lunar phases, computed from astronomical formulas right on your device, no server calls. • Smart planner that flags hard days before you schedule heavy work, so you can move things before they bite.

AI COACH (PEMSI PRO) Ask why you feel tired today, what to eat, how to move — get warm, evidence-based answers keyed to your phase and your last 30 days of symptoms. No horoscopes, no preaching, just tailored guidance. Speaks English, Ukrainian and Russian.

WELLNESS LIBRARY • 5 guided breath patterns (box, 4-7-8, coherent, energizing, belly) proven to lower stress within minutes. • Daily AI Insight (Pemsi Pro): a one-line, evidence-based suggestion personalised to today.

PRIVACY FIRST Your cycle data lives on your device by default. Optional end-to-end encrypted cloud sync — even we can't read your logs. No ads, no third-party analytics, no selling of any kind. Ever.

LINKS Privacy Policy: https://pemsi.serenity.games/privacy Support: https://pemsi.serenity.games/support Terms of Service: https://pemsi.serenity.games/terms Apple Standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/