#C66637
Closest named color: Terra Cotta (#C9643B). oklch(61.5% 0.137 45), rgb(198, 102, 55).
Aa
Black text reads best on this color (5.35:1).
About this color
#C66637 is a medium-dark, moderately saturated brown. In OKLCH its lightness is 61%, its chroma 0.137 and its hue 45°. Its hue sits on the warm side of the wheel. The nearest named color is Terra Cotta (#C9643B), ΔE 0.009 away. Black text reads best on it, at 5.35:1.
| Hue family | Browns |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.137) |
| Temperature | warm |
| Nearest name | Terra Cotta (#C9643B) |
| Black text | 5.35:1 |
| White text | 3.92:1 |
Values
| HEX | #C66637 |
| RGB | rgb(198, 102, 55) |
| HSL | hsl(20, 57%, 50%) |
| OKLCH | oklch(61.5% 0.137 45) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #C66637 | 3.92:1 | AA large text | Lc -71.6 | Content text, not long reading |
| Black text on #C66637 | 5.35:1 | AA | Lc 37.9 | Non-text elements, placeholder text |
| #C66637 text on white | 3.92:1 | AA large text | Lc 66.1 | Content text, not long reading |
| #C66637 text on black | 5.35:1 | AA | Lc -35.5 | Non-text elements, placeholder text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 500.
-
Step 50
50
#FBF4F1
oklch(97.2% 0.009 44.9)
-
Step 100
100
#F6E6DF
oklch(93.6% 0.02 45.3)
-
Step 200
200
#EFD2C5
oklch(88.4% 0.037 45.6)
-
Step 300
300
#E6B49D
oklch(80.9% 0.067 45.9)
-
Step 400
400
#D88B67
oklch(70.8% 0.107 45.6)
-
Step 500
500 (this color)
#C66637
oklch(61.5% 0.137 45)
-
Step 600
600
#B75015
oklch(55.6% 0.149 45.1)
-
Step 700
700
#9D4004
oklch(49% 0.138 45.1)
-
Step 800
800
#80360B
oklch(42.8% 0.114 45.3)
-
Step 900
900
#672F13
oklch(37.6% 0.09 44.8)
-
Step 950
950
#3D1C0D
oklch(27% 0.057 44)
#C66637 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #817332 | 0.124 |
| Deuteranopia (no green cones) | #988935 | 0.114 |
| Tritanopia (no blue cones) | #D9525C | 0.076 |
| Achromatopsia (no color) | #818181 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C66637
#C66637
oklch(61.5% 0.137 45)
- #0092B9
#0092B9
oklch(61.4% 0.117 225.3)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #C66637, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Terra Cotta #C9643B ΔE 0.009
- Terracotta #CA6641 ΔE 0.013
- Terracota #CB6843 ΔE 0.016
- Adobe #BD6C48 ΔE 0.022
- Rust #CA6702 ΔE 0.029
- Tiger's Eye #BC6C25 ΔE 0.030
- Chocolate #D2691E ΔE 0.030
- Rusty Orange #CD5909 ΔE 0.032
Use #C66637 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.