Hair moves over months, not weeks — slower than your memory of it. Change the angle or the light between two photos and you're comparing nothing. So people quit treatments that work, and stay on ones that don't.
The scale everyone argues about
Dark is hair, light is scalp. Most men asking the question are somewhere between two and three — where the corners have moved but the middle hasn't.
Schematic illustration, not a diagnosis. Stage boundaries are judgement calls — which is exactly the problem.
Why your progress photos lie
Hold the phone above eye level and the forehead foreshortens — the hairline looks further back than it is. Drop it below and the same head looks fine. Overhead light empties the temples with shadow. Wet hair always reads worse than dry.
One centimetre of camera height is bigger than a year of real change.
How it works
Front, temples, crown. An on-screen outline locks the angle and the distance, so every later shot can be lined up against this one.
Same outline, same reminder, same day of the month. Thirty seconds, three photos.
Months side by side on one grid, with numbers instead of impressions. If nothing changed, it says nothing changed.
What you get back
Illustrative numbers. Geometry is measured; density is estimated — and the app will always tell you which is which.
Your photos