Flow icon

Your ups and downs, just for fun.

Flow shows your biorhythm: three waves for body, feelings and mind, all starting on the day you were born. Where are you today, and which day this month looks best?

iPhone · In Dutch · Private testing
Flow start screen with the three waves for today
Today
Flow comparing two people: 32% on the same wavelength
You and someone else

Three waves

Body runs in 23 days, feelings in 28, mind in 33. Every day you see where each one is, and whether it's on its way up or down.

Your best day

Flow looks a month ahead and picks the day where everything lines up best.

Slide through time

Drag across the chart to check any day, from a week back to three weeks ahead.

Add someone

Fill in a name and a birthday and see how much you're on the same wavelength. One payment of €0.99 and you can add as many people as you like.

Did you know?

Short facts about where biorhythm came from, from Berlin around 1900 to the pocket calculators of the seventies.

Black and white

Prefer it plain? Switch the waves to white and grey, each with its own line pattern.

Let's be honest: biorhythm has no scientific basis. Flow says so itself and is meant just for fun. No ads, no tracking, no internet needed: birthdays stay on your iPhone. It isn't in the App Store yet.