#633337
Closest named color: Purple Brown (#673A3F). oklch(38.4% 0.069 15.6), rgb(99, 51, 55).
Aa
White text reads best on this color (10.19:1).
About this color
#633337 is a dark, muted red. In OKLCH its lightness is 38%, its chroma 0.069 and its hue 16°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.022 away. White text reads best on it, at 10.19:1.
| Hue family | Reds |
| Lightness | dark (38%) |
| Chroma | muted (0.069) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.05:1 |
| White text | 10.19:1 |
Values
| HEX | #633337 |
| RGB | rgb(99, 51, 55) |
| HSL | hsl(355, 32%, 29%) |
| OKLCH | oklch(38.4% 0.069 15.6) |
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 #633337 | 10.19:1 | AAA | Lc -97.5 | Preferred for body text |
| Black text on #633337 | 2.05:1 | Fails | Lc 10.5 | Not readable |
| #633337 text on white | 10.19:1 | AAA | Lc 93.4 | Preferred for body text |
| #633337 text on black | 2.05:1 | Fails | Lc -9.1 | Not readable |
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 900.
-
Step 50
50
#FAF4F4
oklch(97.2% 0.006 17.3)
-
Step 100
100
#F4E6E6
oklch(93.6% 0.015 17.4)
-
Step 200
200
#ECD2D3
oklch(88.6% 0.029 15.1)
-
Step 300
300
#E0B4B5
oklch(80.9% 0.051 16.7)
-
Step 400
400
#CF8B8F
oklch(70.6% 0.083 15.5)
-
Step 500
500
#C16D74
oklch(63.1% 0.107 15.3)
-
Step 600
600
#AC545D
oklch(55.6% 0.115 15.2)
-
Step 700
700
#93444C
oklch(49% 0.107 15.6)
-
Step 800
800
#78383F
oklch(42.7% 0.09 14.8)
-
Step 900
900 (this color)
#633337
oklch(38.4% 0.069 15.6)
-
Step 950
950
#391D1F
oklch(27% 0.044 15.9)
#633337 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) | #3D3B37 | 0.074 |
| Deuteranopia (no green cones) | #484536 | 0.070 |
| Tritanopia (no blue cones) | #6B2D35 | 0.020 |
| Achromatopsia (no color) | #414141 | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #633337
#633337
oklch(38.4% 0.069 15.6)
- #004E4F
#004E4F
oklch(38.4% 0.065 196.3)
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 #633337, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.022
- Chestnut #742802 ΔE 0.062
- Brownish Purple #76424E ΔE 0.063
- Reddy Brown #6E1005 ΔE 0.074
- Charcoal Grey #3C4142 ΔE 0.077
- Wine Red #7B0323 ΔE 0.078
- Bordeaux #7B002C ΔE 0.081
- Claret #680018 ΔE 0.084
Use #633337 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.