Vellum vs BubuTracker

Vellum is a quiet, private almanac for your menstrual cycle. Estimates only - not medical advice, not a contraceptive. Log periods, symptoms, mood, sleep, basal body temperature, and notes in a local database on your device. Vellum has no sign-in, no accounts, no cloud sync, no analytics SDK, no crash reporter, and no ads. Your cycle data stays on your device unless you choose to export or share a backup. WHAT YOU CAN LOG - Flow level, symptoms, mood, energy, sleep hours - Sexual activity, discharge, medications, free-text notes - Basal body temperature in C or F WHAT YOU SEE - Today screen with an interactive ring showing the selected cycle day and estimated phase - Month calendar with logged days and clearly marked estimates - Insights with temperature and cycle-length charts - Cycle history for reviewing and correcting past cycles - Home-screen widget on iOS showing your cycle day and estimated phase ESTIMATES YOU CAN INSPECT Next period, higher-fertility days, and ovulation timing are estimated from your logged history. Calendar estimates may be wrong and do not confirm ovulation. Vellum is for personal awareness, not diagnosis, treatment, or contraception. Consult a qualified clinician before medical or contraceptive decisions. Sources and methodology are available inside the app. LOCAL REMINDERS Period, higher-fertility, ovulation, and daily check-in reminders are scheduled on your device. Turn each on or off individually. APP LOCK Use Face ID, Touch ID, or your device passcode to lock the app. Sensitive content is covered when the app moves to the background. EXPORT AND IMPORT Save a JSON backup or CSV of your logs through the share sheet. JSON backups are validated before restoration. Exported copies remain under your control. SIX LANGUAGES English, Spanish, French, Portuguese, German, and Arabic. No sign-in, no cross-device sync, no HealthKit access, no advertising, and no third-party tracking.

Period Tracker is a calm, privacy-first way to track your menstrual cycle. Everything stays on your device — no account, no cloud, no sharing, ever. PRIVATE BY DESIGN Your data never leaves your phone. There's no sign-up, no server, and no tracking. Everything you log is stored locally, and deleting the app deletes all of it. Period Tracker contains no analytics, no ads, and no third-party trackers. ONE TAP A DAY Log your flow, mood, and symptoms in seconds. Periods are figured out for you from the days you log — no need to mark start and end dates manually. The app learns your pattern over time. SMART, GENTLE PREDICTIONS See your predicted next period, fertile window, and ovulation day, plus a confidence range that adjusts as you log more. A cycle ring on the Today screen shows where you are in your cycle at a glance. These are educational estimates, not medical advice. STAY IN THE LOOP Optional local reminders — scheduled entirely on your device — can alert you before your period, on period day, at the start of your fertile window, and on ovulation day. You choose the time and how many days ahead. EVERYTHING IN ONE PLACE • Today — your cycle ring and a timeline of what's coming up • Calendar — a clean month view with your logged days and predictions • History — a reverse-chronological journal of your days, filterable by flow, mood, and symptoms • Insights — averages, trends, and a "count as period" toggle to fine-tune predictions NO ACCOUNTS, NO CLOUD, NO WORRY Period Tracker works completely offline. There is nothing to sign up for and nothing that can be leaked or sold, because nothing ever leaves your device. Note: Period Tracker provides educational estimates only and is not a medical device or a substitute for professional medical advice. Always consult a healthcare professional for health decisions. Requires iOS 17 or later. Works on iPhone and iPad.