#23101B
Closest named color: Rich Black (#0D1B2A). oklch(20.5% 0.037 345.1), rgb(35, 16, 27).
Aa
White text reads best on this color (18.08:1).
About this color
#23101B is a very dark, muted red. In OKLCH its lightness is 21%, its chroma 0.037 and its hue 345°. Its hue sits on the warm side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.054 away. White text reads best on it, at 18.08:1.
| Hue family | Reds |
| Lightness | very dark (21%) |
| Chroma | muted (0.037) |
| Temperature | warm |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.16:1 |
| White text | 18.08:1 |
Values
| HEX | #23101B |
| RGB | rgb(35, 16, 27) |
| HSL | hsl(325, 37%, 10%) |
| OKLCH | oklch(20.5% 0.037 345.1) |
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 #23101B | 18.08:1 | AAA | Lc -106.9 | Preferred for body text |
| Black text on #23101B | 1.16:1 | Fails | Lc 0.0 | Not readable |
| #23101B text on white | 18.08:1 | AAA | Lc 104.7 | Preferred for body text |
| #23101B text on black | 1.16:1 | 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
#F9F4F6
oklch(97.2% 0.006 350.8)
-
Step 100
100
#F1E7EC
oklch(93.7% 0.013 345.5)
-
Step 200
200
#E6D3DD
oklch(88.5% 0.025 344.5)
-
Step 300
300
#D6B6C7
oklch(80.9% 0.043 344.8)
-
Step 400
400
#C18FAA
oklch(70.6% 0.07 345.4)
-
Step 500
500
#B07396
oklch(63% 0.089 344.6)
-
Step 600
600
#9B5B80
oklch(55.5% 0.097 345)
-
Step 700
700
#844B6C
oklch(49.1% 0.089 345.1)
-
Step 800
800
#6C3E58
oklch(42.8% 0.074 345.7)
-
Step 900
900
#583549
oklch(37.8% 0.058 345)
-
Step 950
950 (this color)
#23101B
oklch(20.5% 0.037 345.1)
#23101B 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) | #11141B | 0.039 |
| Deuteranopia (no green cones) | #16171B | 0.035 |
| Tritanopia (no blue cones) | #251014 | 0.015 |
| Achromatopsia (no color) | #161616 | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #23101B
#23101B
oklch(20.5% 0.037 345.1)
- #041C13
#041C13
oklch(20.4% 0.036 165.9)
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 #23101B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.054
- Dark Maroon #3C0008 ΔE 0.067
- Very Dark Brown #1D0200 ΔE 0.068
- Very Dark Purple #2A0134 ΔE 0.068
- Jet #212529 ΔE 0.069
- Dark #1B2431 ΔE 0.069
- Almost Black #070D0D ΔE 0.070
- Rich Navy #001219 ΔE 0.070
Use #23101B 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.