Undertone is the one fact every color decision depends on, and it's the one a mirror won't give you — you can't see a hue that only exists by comparison. Glancely reads it from a single selfie, warm, cool, or neutral, shows you the observations behind the verdict, and then does the part a quiz never could: it puts the colors that suit that undertone on your own hair.
Surface tone is what you see — fair, medium, deep, the shade a foundation bottle names. Undertone is the temperature underneath it, and it's nearly invisible on its own. Two people with the same surface tone can sit on opposite sides of warm and cool, and the only way to tell is to hold something next to the skin and watch what happens.
That's why every at-home method is a comparison: veins against skin, white against cream, silver against gold. They work, roughly, when the light is honest and you're not already sure of the answer you want. An app that measures the whole face at once removes both problems — the light is accounted for, and the reader has no preference.
A quiz hands you "cool" and walks away. Glancely tells you what it saw that made it say cool — so if the answer surprises you, you can check it against your own face instead of taking it on faith.
Plenty of people are genuinely neutral, and most quizzes force them warm or cool anyway. Glancely reports neutral when it's neutral, and leans on depth instead — which is what actually decides your colors in that case.
Knowing your undertone is only useful once it changes a decision. The same read that names your temperature drives the hair colors Glancely recommends, so "cool" turns into "ash brown, not caramel" — rendered on you.
Most people go looking for their undertone because a color went wrong — a blonde that turned them sallow, a foundation that oxidized orange, a red that looked incredible on someone else. Hair is where the mistake costs the most: it's the largest block of color next to your face, and undoing it takes months or a correction appointment.
So Glancely treats the undertone read as step one of the color decision, not a standalone label. Once you have it, see the colors that agree with it on your own hair — or, if you're weighing a cut at the same time, let the AI judge cut and color separately so you know which half is doing the work.
Yes — Glancely, free to download on iOS. One selfie is read for undertone — warm, cool, or neutral — with the reasoning shown, alongside tone depth and surface qualities, and the app turns that read into the color directions that flatter you, each one previewable on your own hair.
By comparing, not by guessing. Undertone is the hue sitting underneath your surface skin color, and it only shows up relative to something else — which is why the vein test and the white-versus-cream test exist. Glancely reads the skin across the whole face in one pass, weighs those relative signals together, and reports the verdict with the observations behind it, so you can see why it landed where it did.
It's the foundation of one. A seasonal analysis is built on three readings — undertone, depth, and how clear or soft your coloring is — and Glancely gives you the first two with reasoning, then applies them to the decision that costs the most to get wrong: your hair color. If you want a wardrobe palette for clothes and makeup, the undertone read here is the fact you carry into that; if you want to know which hair colors suit you, this is the whole answer.
Warm undertones usually carry golden, honey, caramel, copper, and chocolate shades; cool undertones usually carry ash, platinum, beige, espresso, and blue-black; neutral undertones can move in both directions and are more sensitive to depth than to temperature. Those are the rules of thumb — Glancely gives you the version specific to you, and lets you see each direction on your own hair instead of trusting the rule.
Daylight, ideally facing a window, and no filter. Warm bulbs push every face toward golden and cool LEDs push every face toward pink, so a bathroom selfie can fool any reader, human or otherwise. Bare skin or minimal makeup helps too — foundation is designed to hide exactly what you're trying to measure.
Glancely is free to download on iOS. Your selfie goes in, your analysis comes back, and Glancely Premium opens up the rest — unlimited try-ons, premium styles, and richer recommendations.
One selfie, your undertone read with the reasoning shown, and the colors that agree with it — seen on your own hair before anything is mixed.
Free on iOS