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Free tools
Two things that make progress photos worth taking. Both 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.
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.