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Free tools
Two things that make progress photos worth taking, and one that decides what to test first. All three run entirely in your browser: no upload, no account, no usage limit, and they keep working with the Wi-Fi off. We do not see your photos because there is nowhere for them to go.
Same-Light Check
Reads the actual brightness of what your camera sees and tells you whether the light is usable — and whether today matches the spot you saved.
Before/After Maker
Two photos in, one aligned side-by-side out, in feed and story sizes. Eye-line alignment, optional blur, real day numbers.
Routine test planner
Tick the ingredients you already own; get the order to introduce them and the week each one is due an answer. No products, no application order.
There is deliberately no "scan my skin" button on this website. A real reading costs money to run, invites abuse, and would mean uploading your face — which would break the only promise these tools make. The reading lives in the iPhone app; here you get an interactive demo on sample data.