#631500
Closest named color: Reddy Brown (#6E1005). oklch(33% 0.114 35.5), rgb(99, 21, 0).
Aa
White text reads best on this color (12.82:1).
About this color
#631500 is a dark, moderately saturated red. In OKLCH its lightness is 33%, its chroma 0.114 and its hue 35°. Its hue sits on the warm side of the wheel. The nearest named color is Reddy Brown (#6E1005), ΔE 0.025 away. White text reads best on it, at 12.82:1.
| Hue family | Reds |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.114) |
| Temperature | warm |
| Nearest name | Reddy Brown (#6E1005) |
| Black text | 1.63:1 |
| White text | 12.82:1 |
Values
| HEX | #631500 |
| RGB | rgb(99, 21, 0) |
| HSL | hsl(13, 100%, 19%) |
| OKLCH | oklch(33% 0.114 35.5) |
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 #631500 | 12.82:1 | AAA | Lc -101.3 | Preferred for body text |
| Black text on #631500 | 1.63:1 | Fails | Lc 0.0 | Not readable |
| #631500 text on white | 12.82:1 | AAA | Lc 97.8 | Preferred for body text |
| #631500 text on black | 1.63:1 | Fails | Lc 0.0 | 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
#FDF3F0
oklch(97.1% 0.012 37.4)
-
Step 100
100
#FAE4DF
oklch(93.5% 0.025 32.9)
-
Step 200
200
#F7CFC4
oklch(88.6% 0.048 35.9)
-
Step 300
300
#F2AD9B
oklch(80.8% 0.086 35.2)
-
Step 400
400
#E97E63
oklch(70.7% 0.138 35.2)
-
Step 500
500
#DF5835
oklch(63.1% 0.176 35.5)
-
Step 600
600
#CA3704
oklch(55.6% 0.19 35.6)
-
Step 700
700
#AC2C00
oklch(49.2% 0.17 35.6)
-
Step 800
800
#8D2301
oklch(42.6% 0.146 35.6)
-
Step 900
900 (this color)
#631500
oklch(33% 0.114 35.5)
-
Step 950
950
#43160B
oklch(27% 0.073 35)
#631500 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) | #2E2700 | 0.118 |
| Deuteranopia (no green cones) | #413800 | 0.105 |
| Tritanopia (no blue cones) | #6E0011 | 0.036 |
| Achromatopsia (no color) | #323232 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #631500
#631500
oklch(33% 0.114 35.5)
- #003D48
#003D48
oklch(33.1% 0.058 214.3)
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 #631500, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Reddy Brown #6E1005 ΔE 0.025
- Claret #680018 ΔE 0.040
- Blood #770001 ΔE 0.045
- Burgundy #610023 ΔE 0.057
- Chestnut #742802 ΔE 0.057
- Maroon #800000 ΔE 0.063
- Wine Red #7B0323 ΔE 0.067
- Mahogany #4A0100 ΔE 0.074
Use #631500 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.