#633331
Closest named color: Purple Brown (#673A3F). oklch(38.2% 0.07 23.3), rgb(99, 51, 49).
Aa
White text reads best on this color (10.25:1).
About this color
#633331 is a dark, muted red. In OKLCH its lightness is 38%, its chroma 0.070 and its hue 23°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.026 away. White text reads best on it, at 10.25:1.
| Hue family | Reds |
| Lightness | dark (38%) |
| Chroma | muted (0.070) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.04:1 |
| White text | 10.25:1 |
Values
| HEX | #633331 |
| RGB | rgb(99, 51, 49) |
| HSL | hsl(2, 34%, 29%) |
| OKLCH | oklch(38.2% 0.07 23.3) |
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 #633331 | 10.25:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #633331 | 2.04:1 | Fails | Lc 10.4 | Not readable |
| #633331 text on white | 10.25:1 | AAA | Lc 93.5 | Preferred for body text |
| #633331 text on black | 2.04:1 | Fails | Lc -9.0 | 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
#FAF4F3
oklch(97.2% 0.007 28.8)
-
Step 100
100
#F4E6E5
oklch(93.6% 0.015 22.4)
-
Step 200
200
#ECD2D0
oklch(88.5% 0.029 23)
-
Step 300
300
#E1B4B1
oklch(80.9% 0.053 22.7)
-
Step 400
400
#D08C88
oklch(70.7% 0.084 23.1)
-
Step 500
500
#C26E6A
oklch(63.1% 0.107 23.4)
-
Step 600
600
#AD5552
oklch(55.6% 0.116 23.5)
-
Step 700
700
#944543
oklch(49.1% 0.107 23.3)
-
Step 800
800
#783937
oklch(42.6% 0.089 23.4)
-
Step 900
900 (this color)
#633331
oklch(38.2% 0.07 23.3)
-
Step 950
950
#391D1C
oklch(26.9% 0.044 22.6)
#633331 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) | #3E3B31 | 0.072 |
| Deuteranopia (no green cones) | #494530 | 0.069 |
| Tritanopia (no blue cones) | #6C2C33 | 0.024 |
| Achromatopsia (no color) | #414141 | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #633331
#633331
oklch(38.2% 0.07 23.3)
- #004D53
#004D53
oklch(38.3% 0.065 203.8)
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 #633331, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.026
- Chestnut #742802 ΔE 0.054
- Brownish Purple #76424E ΔE 0.067
- Reddy Brown #6E1005 ΔE 0.070
- Charcoal Grey #3C4142 ΔE 0.077
- Mud Brown #60460F ΔE 0.077
- Wine Red #7B0323 ΔE 0.079
- Blood #770001 ΔE 0.082
Use #633331 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.