Jewish Period Tracker: Why a Regular Period App Isn't Enough

6 min read · October 22, 2026

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Regular period trackers are built to predict ovulation and the next bleed by Gregorian date. A woman keeping taharas hamishpacha needs something else: a calendar that counts by Hebrew date and onah, projects the vestos, and walks her from the onset through the hefsek and the seven clean days to mikvah night.

What it has to do

• Count in Hebrew dates, with every day split into a night and a day onah.
• Use the real sunset and sunrise where you are — and where you were, if you recorded something away from home.
• Project all three vestos, with or zarua and day 31 where your custom keeps them.
• Know the 4- or 5-day minimum, the hefsek, the seven clean days and their bedikos, and mikvah night after tzeis.
• Recognise a veses kavua, and never decide on its own that one has been uprooted.
• Let your rav choose between the opinions — and lock them.
• Remind you before each onah, without putting anything personal in the notification.

Privacy

This is the most private record there is. Look for an app that encrypts it, keeps notifications neutral, never sells data, and lets you delete everything.

Lunarah

Lunarah was built for exactly this: every machlokes is a setting your rav can choose and lock, the sun is computed for where you are, reminders are neutral, and the calendar can be shared read-only with your rav. It is free to use, works offline and installs as an app on any phone or computer.

This guide explains the general rules and the common customs. Where poskim differ it says so — it does not rule. For your own questions, ask your rav.