#12233E
Closest named color: Oxford Blue (#1B263B). oklch(25.7% 0.056 259.3), rgb(18, 35, 62).
Aa
White text reads best on this color (15.72:1).
About this color
#12233E is a dark, muted blue. In OKLCH its lightness is 26%, its chroma 0.056 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.019 away. White text reads best on it, at 15.72:1.
| Hue family | Blues |
| Lightness | dark (26%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.33:1 |
| White text | 15.72:1 |
Values
| HEX | #12233E |
| RGB | rgb(18, 35, 62) |
| HSL | hsl(217, 55%, 16%) |
| OKLCH | oklch(25.7% 0.056 259.3) |
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 #12233E | 15.72:1 | AAA | Lc -105.2 | Preferred for body text |
| Black text on #12233E | 1.33:1 | Fails | Lc 0.0 | Not readable |
| #12233E text on white | 15.72:1 | AAA | Lc 102.6 | Preferred for body text |
| #12233E 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF7
oklch(93.5% 0.02 260.2)
-
Step 200
200
#CBDAF2
oklch(88.5% 0.037 259.8)
-
Step 300
300
#A7C2EC
oklch(80.8% 0.067 259.1)
-
Step 400
400
#78A2E3
oklch(70.8% 0.106 258.9)
-
Step 500
500
#5589DB
oklch(63.2% 0.136 259.2)
-
Step 600
600
#3A71C8
oklch(55.6% 0.147 259.3)
-
Step 700
700
#2C5EAD
oklch(49.1% 0.137 259.3)
-
Step 800
800
#264D8C
oklch(42.7% 0.114 259.6)
-
Step 900
900
#234170
oklch(37.7% 0.088 259.1)
-
Step 950
950 (this color)
#12233E
oklch(25.7% 0.056 259.3)
#12233E 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) | #17253F | 0.010 |
| Deuteranopia (no green cones) | #11213D | 0.007 |
| Tritanopia (no blue cones) | #00292D | 0.047 |
| Achromatopsia (no color) | #232323 | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #12233E
#12233E
oklch(25.7% 0.056 259.3)
- #312000
#312000
oklch(25.8% 0.054 79.7)
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 #12233E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.019
- Dark #1B2431 ΔE 0.028
- Rich Black #0D1B2A ΔE 0.045
- Jet #212529 ΔE 0.047
- Space Cadet #2B2D42 ΔE 0.054
- Gunmetal #293241 ΔE 0.064
- Navy Blue #001146 ΔE 0.066
- Marine #042E60 ΔE 0.066
Use #12233E 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.