#0A2123
Closest named color: Rich Black (#0D1B2A). oklch(23% 0.029 203), rgb(10, 33, 35).
Aa
White text reads best on this color (16.73:1).
About this color
#0A2123 is a very dark close to neutral grey. In OKLCH its lightness is 23%, its chroma 0.029. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.030 away. White text reads best on it, at 16.73:1.
| Hue family | Neutrals |
| Lightness | very dark (23%) |
| Chroma | close to neutral grey (0.029) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.25:1 |
| White text | 16.73:1 |
Values
| HEX | #0A2123 |
| RGB | rgb(10, 33, 35) |
| HSL | hsl(185, 56%, 9%) |
| OKLCH | oklch(23% 0.029 203) |
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 #0A2123 | 16.73:1 | AAA | Lc -106.0 | Preferred for body text |
| Black text on #0A2123 | 1.25:1 | Fails | Lc 0.0 | Not readable |
| #0A2123 text on white | 16.73:1 | AAA | Lc 103.6 | Preferred for body text |
| #0A2123 text on black | 1.25:1 | 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E3ECED
oklch(93.7% 0.01 204.9)
-
Step 200
200
#CBDDDF
oklch(88.5% 0.019 204.8)
-
Step 300
300
#A8C8CA
oklch(81% 0.034 201.2)
-
Step 400
400
#77ABB0
oklch(70.7% 0.055 203.5)
-
Step 500
500
#51969C
oklch(63% 0.07 202.9)
-
Step 600
600
#328087
oklch(55.5% 0.076 203.4)
-
Step 700
700
#236C72
oklch(49% 0.071 202.9)
-
Step 800
800
#20585D
oklch(42.6% 0.058 203.4)
-
Step 900
900
#20494C
oklch(37.7% 0.046 201.8)
-
Step 950
950 (this color)
#0A2123
oklch(23% 0.029 203)
#0A2123 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) | #1E1F23 | 0.029 |
| Deuteranopia (no green cones) | #1A1C23 | 0.028 |
| Tritanopia (no blue cones) | #002322 | 0.013 |
| Achromatopsia (no color) | #1E1E1E | 0.029 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A2123
#0A2123
oklch(23% 0.029 203)
- #291817
#291817
oklch(23.1% 0.028 23.1)
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 #0A2123, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.030
- Dark #1B2431 ΔE 0.038
- Jet #212529 ΔE 0.039
- Oxford Blue #1B263B ΔE 0.054
- Rich Navy #001219 ΔE 0.062
- Dark Forest Green #002D04 ΔE 0.078
- Very Dark Green #062E03 ΔE 0.080
- Almost Black #070D0D ΔE 0.080
Use #0A2123 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.