Simple Cycle vs Vellum

Your cycle. Your business. Simple Cycle is a private period tracker for keeping useful records without accounts, ads, tracking, or subscriptions. Period dates, symptoms, and notes are stored locally on your iPhone. We don't collect your cycle or symptom data. There is no cloud sync, Apple Health connection, or automatic sharing. Export a copy only when you choose. START WITH WHAT YOU KNOW Add a period with start and end dates, record an ongoing period, or come back to earlier dates. Edit a whole period without losing its symptoms or notes. Setup is optional: you don't need to rebuild years of history to begin. LOG YOUR WAY Record flow, cramps, mood, and notes on any day. Add custom symptoms, put favorites first, and leave anything blank. An unanswered field stays unanswered. SEE YOUR HISTORY CLEARLY Compare completed cycle lengths and period lengths, with the number of records behind each summary. Browse a dated timeline of symptoms and notes, filter entries, and return to a day to make a correction. YOUR RECORDS. YOUR CALL. Create a readable PDF report or CSV file right on your iPhone. Choose the dates, symptoms, and notes to include, preview the result, then decide whether to share. Export and deletion remain available after your trial ends. Add an optional app lock using Face ID, Touch ID, or your iPhone passcode. ESTIMATES ARE OPTIONAL Show or hide period estimates and choose whether to receive a period reminder. An estimated fertile window is available only if you turn it on. It does not confirm ovulation. Estimated fertile window based on cycle averages. Not a contraceptive. Not for family planning. ONE PURCHASE. NO SUBSCRIPTION. Try everything free for seven days, then keep tracking with one lifetime purchase. No recurring payments. No ads. No tracking. Ever. Built by Under5.

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.