#510101
Closest named color: Mahogany (#4A0100). oklch(27.4% 0.111 28.9), rgb(81, 1, 1).
Aa
White text reads best on this color (15.50:1).
About this color
#510101 is a dark, moderately saturated red. In OKLCH its lightness is 27%, its chroma 0.111 and its hue 29°. Its hue sits on the warm side of the wheel. The nearest named color is Mahogany (#4A0100), ΔE 0.018 away. White text reads best on it, at 15.50:1.
| Hue family | Reds |
| Lightness | dark (27%) |
| Chroma | moderately saturated (0.111) |
| Temperature | warm |
| Nearest name | Mahogany (#4A0100) |
| Black text | 1.35:1 |
| White text | 15.50:1 |
Values
| HEX | #510101 |
| RGB | rgb(81, 1, 1) |
| HSL | hsl(0, 98%, 16%) |
| OKLCH | oklch(27.4% 0.111 28.9) |
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 #510101 | 15.50:1 | AAA | Lc -103.9 | Preferred for body text |
| Black text on #510101 | 1.35:1 | Fails | Lc 0.0 | Not readable |
| #510101 text on white | 15.50:1 | AAA | Lc 101.0 | Preferred for body text |
| #510101 text on black | 1.35:1 | 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 950.
-
Step 50
50
#FFF2F0
oklch(97.1% 0.014 28)
-
Step 100
100
#FFE2DE
oklch(93.5% 0.033 27.1)
-
Step 200
200
#FFCBC2
oklch(88.5% 0.061 29.7)
-
Step 300
300
#FFA698
oklch(81% 0.108 29.4)
-
Step 400
400
#FF6A59
oklch(70.7% 0.185 29.1)
-
Step 500
500
#FF0F0E
oklch(63.1% 0.255 28.9)
-
Step 600
600
#D90004
oklch(55.6% 0.228 28.9)
-
Step 700
700
#B80003
oklch(49.2% 0.201 28.9)
-
Step 800
800
#980002
oklch(42.7% 0.175 28.9)
-
Step 900
900
#800001
oklch(37.7% 0.154 29)
-
Step 950
950 (this color)
#510101
oklch(27.4% 0.111 28.9)
#510101 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) | #1E1900 | 0.121 |
| Deuteranopia (no green cones) | #312A00 | 0.107 |
| Tritanopia (no blue cones) | #5A0002 | 0.022 |
| Achromatopsia (no color) | #242424 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #510101
#510101
oklch(27.4% 0.111 28.9)
- #002E34
#002E34
oklch(27.6% 0.047 208.4)
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 #510101, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mahogany #4A0100 ΔE 0.018
- Deep Brown #410200 ΔE 0.040
- Chocolate Brown #411900 ΔE 0.050
- Dark Maroon #3C0008 ΔE 0.055
- Burgundy #610023 ΔE 0.059
- Claret #680018 ΔE 0.061
- Reddy Brown #6E1005 ΔE 0.076
- Dark Brown #341C02 ΔE 0.077
Use #510101 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.