#903639
Closest named color: Auburn (#9B2226). oklch(46.1% 0.122 21.3), rgb(144, 54, 57).
Aa
White text reads best on this color (7.57:1).
About this color
#903639 is a medium-dark, moderately saturated red. In OKLCH its lightness is 46%, its chroma 0.122 and its hue 21°. Its hue sits on the warm side of the wheel. The nearest named color is Auburn (#9B2226), ΔE 0.036 away. White text reads best on it, at 7.57:1.
| Hue family | Reds |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.122) |
| Temperature | warm |
| Nearest name | Auburn (#9B2226) |
| Black text | 2.77:1 |
| White text | 7.57:1 |
Values
| HEX | #903639 |
| RGB | rgb(144, 54, 57) |
| HSL | hsl(358, 45%, 39%) |
| OKLCH | oklch(46.1% 0.122 21.3) |
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 #903639 | 7.57:1 | AAA | Lc -90.5 | Preferred for body text |
| Black text on #903639 | 2.77:1 | Fails | Lc 18.4 | Dividers and decoration only |
| #903639 text on white | 7.57:1 | AAA | Lc 85.6 | Fine for body text |
| #903639 text on black | 2.77:1 | Fails | Lc -16.4 | Dividers and decoration only |
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 700.
-
Step 50
50
#FBF3F3
oklch(97% 0.009 17.3)
-
Step 100
100
#F5E6E5
oklch(93.7% 0.016 22.1)
-
Step 200
200
#EED1D0
oklch(88.5% 0.033 20.1)
-
Step 300
300
#E5B2B0
oklch(80.9% 0.06 21.1)
-
Step 400
400
#D58987
oklch(70.7% 0.094 21.3)
-
Step 500
500
#C86969
oklch(63.1% 0.121 21.1)
-
Step 600
600
#B34F50
oklch(55.6% 0.131 21.7)
-
Step 700
700 (this color)
#903639
oklch(46.1% 0.122 21.3)
-
Step 800
800
#7D3536
oklch(42.8% 0.1 21.4)
-
Step 900
900
#652F2F
oklch(37.8% 0.078 21.5)
-
Step 950
950
#3B1C1C
oklch(27% 0.049 20.8)
#903639 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) | #4C4838 | 0.132 |
| Deuteranopia (no green cones) | #635B37 | 0.121 |
| Tritanopia (no blue cones) | #9E2538 | 0.036 |
| Achromatopsia (no color) | #545454 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #903639
#903639
oklch(46.1% 0.122 21.3)
- #00656A
#00656A
oklch(46.1% 0.078 200.7)
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 #903639, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Auburn #9B2226 ΔE 0.036
- Red Brown #8B2E16 ΔE 0.040
- Brick #A03623 ΔE 0.041
- Brown #A52A2A ΔE 0.044
- Brown Red #922B05 ΔE 0.046
- Rust Brown #8B3103 ΔE 0.050
- Burnt Red #9F2305 ΔE 0.051
- Brownish Purple #76424E ΔE 0.057
Use #903639 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.