#12243A
Closest named color: Oxford Blue (#1B263B). oklch(25.7% 0.048 254.3), rgb(18, 36, 58).
Aa
White text reads best on this color (15.68:1).
About this color
#12243A is a dark, muted blue. In OKLCH its lightness is 26%, its chroma 0.048 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.015 away. White text reads best on it, at 15.68:1.
| Hue family | Blues |
| Lightness | dark (26%) |
| Chroma | muted (0.048) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.33:1 |
| White text | 15.68:1 |
Values
| HEX | #12243A |
| RGB | rgb(18, 36, 58) |
| HSL | hsl(213, 53%, 15%) |
| OKLCH | oklch(25.7% 0.048 254.3) |
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 #12243A | 15.68:1 | AAA | Lc -105.2 | Preferred for body text |
| Black text on #12243A | 1.33:1 | Fails | Lc 0.0 | Not readable |
| #12243A text on white | 15.68:1 | AAA | Lc 102.5 | Preferred for body text |
| #12243A text on black | 1.33:1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EBF5
oklch(93.7% 0.016 253.9)
-
Step 200
200
#CBDBEE
oklch(88.5% 0.031 252.7)
-
Step 300
300
#A8C3E5
oklch(80.9% 0.057 254.3)
-
Step 400
400
#79A4D9
oklch(70.8% 0.091 254.1)
-
Step 500
500
#558CCE
oklch(63.1% 0.116 253.9)
-
Step 600
600
#3975BB
oklch(55.6% 0.126 253.9)
-
Step 700
700
#2B62A2
oklch(49.2% 0.118 254.1)
-
Step 800
800
#255083
oklch(42.7% 0.098 254.3)
-
Step 900
900
#234369
oklch(37.8% 0.076 253.9)
-
Step 950
950 (this color)
#12243A
oklch(25.7% 0.048 254.3)
#12243A 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) | #1B253B | 0.014 |
| Deuteranopia (no green cones) | #16213A | 0.011 |
| Tritanopia (no blue cones) | #00292C | 0.040 |
| Achromatopsia (no color) | #232323 | 0.048 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #12243A
#12243A
oklch(25.7% 0.048 254.3)
- #311F05
#311F05
oklch(25.6% 0.048 72.9)
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 #12243A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.015
- Dark #1B2431 ΔE 0.020
- Jet #212529 ΔE 0.039
- Rich Black #0D1B2A ΔE 0.041
- Space Cadet #2B2D42 ΔE 0.053
- Gunmetal #293241 ΔE 0.061
- Marine #042E60 ΔE 0.072
- Navy Blue #001146 ΔE 0.072
Use #12243A 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.