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
Filled areas are hair, empty areas are scalp. Most men asking the question sit 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.
What the scale leaves out
Those seven stages describe one route — the common male pattern. Plenty of hair loss takes a different one, and the difference matters, because two of these are not something an app should be commenting on at all.
Scalpline measures geometry precisely and density approximately. It cannot tell you which of these you have, or why — and it will not pretend otherwise.
Why your progress photos lie
Lift the phone above eye level and the forehead foreshortens: the hairline reads further back than it is. Drop it and the same head looks fine. Overhead light empties the temples with shadow. Wet hair reads worse than dry.
Which is why a fixed setup comes before any comparison.
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
Neither can anyone else. They are the same scalp, twelve months apart. That is what real progress looks like: nothing you can see, and something you can measure.
Illustrative numbers. Geometry is measured, density is estimated, and the app always says which is which. Nothing here is a verdict on your hair — it is a record of what changed while you were looking at it every day and seeing nothing.
Your photos