HerPhase vs Calla

erPhase is a modern and intuitive period tracker designed to help you understand and manage your menstrual cycle with ease. Track your cycle, log daily symptoms, and view predictions for upcoming periods and fertile windows in a clean and simple interface. FEATURES • Period and cycle tracking • Predicted next period and fertile window • Daily symptom and mood logging • Cycle statistics and insights • Simple and elegant calendar view • Fast and easy-to-use interface HerPhase is designed with privacy in mind. Your personal cycle data stays on your device. DISCLAIMER Cycle predictions are estimates based on your logged data and are intended for informational purposes only. This app should not be used for medical decisions or as a contraceptive method.

Most period apps were built for adults trying to get pregnant. Calla wasn't. It's built for teens who just want to understand what's happening in their body - without the noise, the upsells, or the ovulation countdowns. Your data lives on your phone. No accounts required. No ads. No third parties, no data brokers, no advertisers. Optional parent share, if you want it. Privacy-first. Always. All your data stays on your phone. No accounts. No cloud. No ads. No data selling. Period. Built for how your body actually works Irregular cycles? That's normal, especially when you're starting out. Calla doesn't just assume a 28-day cycle - it learns your patterns and gives you predictions that actually make sense for your body. Track what matters to you Log your period, flow level, mood, energy, cramps, sleep, skin, focus, appetite, and activity. See how your cycle connects to how you feel day to day. Understand your cycle Get gentle, age-appropriate insights about each phase of your cycle - what's happening in your body and what to expect. Prep-day reminders Get a heads-up before your period is predicted to start so you're never caught off guard. Parent Mode Share a simple wellness signal with a parent or guardian - "all good" or "heads up" - without revealing any cycle details. Communication on your terms. Calla is not a medical app. It does not diagnose, treat, or prevent any medical condition. If you have health concerns, talk to a doctor.