How Tonebook actually works
Personal-color analysis used to mean a $300 in-person draping session and a week of waiting. We built a four-step machine read that finishes in under a minute, grounded in the same color theory professional analysts use.
The four reads
Selfie
One photo, taken in indirect daylight, no filter. Your face fills the frame. Tonebook samples skin, hair, and eyes in sRGB and converts to Lab and OKLCH for perceptual accuracy.
Undertone
Warm, cool, or neutral. Read from the relationship between melanin redness, hemoglobin signal, and the underlying yellow-blue axis — not from a wrist-vein guess.
Season
Spring, summer, autumn, or winter — then a sub-season inside that family (twelve total). Decided by undertone × value × chroma, the three axes the personal-color tradition has always run on.
Palette
Twenty-four shades tuned to your sub-season. Clothing, makeup, and hair recommendations follow the same palette so what's in your closet, your bag, and your bathroom all play the same chord.
Why the method matters. The 12-season system was originally codified by Suzanne Caygill and refined through the 1980s color-analysis schools. We didn't invent it. What we built is a phone-camera implementation that reaches the same answer a trained analyst gets, faster and at zero cost — so anyone can try it before booking the session.
Tonebook is built and maintained solo by Ty Horton.