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Everything the app does, written out so you can do it by hand for free. No sign-up, no gated PDF, no "get the checklist in your inbox".

Why the mirror cannot answer this, and a 30-day protocol that can. The main one — start here.

Light, position, distance, time, expression. The six variables that have to hold still.

What the published sources actually say, why "4 to 8 weeks" is doing a lot of work, and when to quit.

A question about time, not appearance. The cited windows, and the day-zero-to-week-six rule that settles it.

What a number computed from a photograph is and is not, what a skin age test really is, and the figure nobody publishes.

Per-ingredient windows, each with the dimension it tends to show up in.

Can I use these two together? Both windows side by side, and a dated order that keeps the answer attributable.