Seed cycling tools
Seed Cycling Calculator & Moon Calendar
Find your Purple and Pink days for the next three months. Takes ten seconds.
For irregular or no periods, perimenopause and menopause. Your Purple and Pink days, set by the moon.
Example dates shown. Change them to yours.
🔔 Get a daily Semi reminder at your timeSwitch back to Purple on the day your next period actually starts, even if that's earlier or later than shown.
Purple from new moon (amavasya) to full moon (purnima), Pink from full moon to the next new moon. Dates in India time.
🔔 Get a daily Semi reminder at your timeA daily Semi nudge, at your time
Pick a time and we'll remind you every day. Each reminder tells you whether it's a Purple or Pink day, with a new Semi line every day, so you never have to think about it.
Pick a time and we'll remind you every day. Each reminder tells you whether it's a Purple or Pink day, switching on every new and full moon, with a new Semi line every day.
Opened this from Instagram or Facebook? Tap ⋯ at the top and choose "Open in browser" first, so your calendar app can add the reminders.
Quick answers
When does my cycle start?
Day 1 is the first day of your period, the first day of real bleeding, not spotting.
My cycle isn't 28 days. Does that matter?
No. Switch to Pink around the middle of your cycle, and stay on it until your next period starts. The calculator does this for you.
My periods are irregular or have stopped. What do I do?
Use the moon tab: Purple from new moon to full moon, Pink from full moon to the next new moon. It suits perimenopause and menopause too.
How much of each seed?
About 1 tablespoon (roughly 10 g) of each of the two seeds for your phase. One Semi bar has about 10 g of each.
How long should I keep going?
We recommend the 3-month plan, so the habit has time to settle in.
Seed cycling, without the effort
One Semi bar a day: the right seeds for each phase, already measured. Purple for the first half, Pink for the second.
Find your packDates are estimates based on what you enter. Seed cycling is a food habit, not a medicine. If you're pregnant, breastfeeding or on medication, please check with your doctor first.