#1B234C
Closest named color: Oxford Blue (#1B263B). oklch(27.4% 0.076 272.2), rgb(27, 35, 76).
Aa
White text reads best on this color (15.09:1).
About this color
#1B234C is a dark, moderately saturated blue. In OKLCH its lightness is 27%, its chroma 0.076 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.035 away. White text reads best on it, at 15.09:1.
| Hue family | Blues |
| Lightness | dark (27%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.39:1 |
| White text | 15.09:1 |
Values
| HEX | #1B234C |
| RGB | rgb(27, 35, 76) |
| HSL | hsl(230, 48%, 20%) |
| OKLCH | oklch(27.4% 0.076 272.2) |
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 #1B234C | 15.09:1 | AAA | Lc -104.6 | Preferred for body text |
| Black text on #1B234C | 1.39:1 | Fails | Lc 0.0 | Not readable |
| #1B234C text on white | 15.09:1 | AAA | Lc 101.8 | Preferred for body text |
| #1B234C text on black | 1.39:1 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FC
oklch(93.5% 0.027 271.9)
-
Step 200
200
#CDD8FB
oklch(88.5% 0.05 271.6)
-
Step 300
300
#ACBEFB
oklch(81% 0.089 271.6)
-
Step 400
400
#8299FA
oklch(70.7% 0.144 272.2)
-
Step 500
500
#657CF7
oklch(63.1% 0.184 272.1)
-
Step 600
600
#4F61E6
oklch(55.6% 0.201 272.3)
-
Step 700
700
#404FC8
oklch(49% 0.187 272.1)
-
Step 800
800
#3542A1
oklch(42.7% 0.153 272.3)
-
Step 900
900
#2D3980
oklch(37.7% 0.12 272.1)
-
Step 950
950 (this color)
#1B234C
oklch(27.4% 0.076 272.2)
#1B234C 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) | #0E284D | 0.020 |
| Deuteranopia (no green cones) | #07244B | 0.023 |
| Tritanopia (no blue cones) | #002C33 | 0.067 |
| Achromatopsia (no color) | #262626 | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B234C
#1B234C
oklch(27.4% 0.076 272.2)
- #312600
#312600
oklch(27.3% 0.056 92.2)
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 #1B234C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.035
- Marine #042E60 ΔE 0.047
- Space Cadet #2B2D42 ΔE 0.050
- Dark #1B2431 ΔE 0.052
- Prussian Blue #1D3557 ΔE 0.058
- Dark Indigo #1F0954 ΔE 0.062
- Gunmetal #293241 ΔE 0.063
- Jet #212529 ΔE 0.068
Use #1B234C 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.