#1B2455
Closest named color: Marine (#042E60). oklch(28.3% 0.089 271.7), rgb(27, 36, 85).
Aa
White text reads best on this color (14.68:1).
About this color
#1B2455 is a dark, moderately saturated blue. In OKLCH its lightness is 28%, its chroma 0.089 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.036 away. White text reads best on it, at 14.68:1.
| Hue family | Blues |
| Lightness | dark (28%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.43:1 |
| White text | 14.68:1 |
Values
| HEX | #1B2455 |
| RGB | rgb(27, 36, 85) |
| HSL | hsl(231, 52%, 22%) |
| OKLCH | oklch(28.3% 0.089 271.7) |
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 #1B2455 | 14.68:1 | AAA | Lc -104.2 | Preferred for body text |
| Black text on #1B2455 | 1.43:1 | Fails | Lc 0.0 | Not readable |
| #1B2455 text on white | 14.68:1 | AAA | Lc 101.3 | Preferred for body text |
| #1B2455 text on black | 1.43:1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FF
oklch(93.5% 0.031 271.7)
-
Step 200
200
#CCD8FF
oklch(88.6% 0.055 271.8)
-
Step 300
300
#AABDFF
oklch(80.8% 0.096 271.7)
-
Step 400
400
#7F98FF
oklch(70.6% 0.153 271.7)
-
Step 500
500
#627AFF
oklch(63.1% 0.198 271.8)
-
Step 600
600
#4A5AF9
oklch(55.6% 0.234 271.8)
-
Step 700
700
#3C48D9
oklch(49.1% 0.218 271.7)
-
Step 800
800
#313CAF
oklch(42.6% 0.181 271.9)
-
Step 900
900
#2A368B
oklch(37.8% 0.141 271.7)
-
Step 950
950 (this color)
#1B2455
oklch(28.3% 0.089 271.7)
#1B2455 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) | #052B57 | 0.027 |
| Deuteranopia (no green cones) | #002654 | 0.027 |
| Tritanopia (no blue cones) | #002F38 | 0.075 |
| Achromatopsia (no color) | #282828 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B2455
#1B2455
oklch(28.3% 0.089 271.7)
- #342800
#342800
oklch(28.3% 0.058 91.4)
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 #1B2455, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.036
- Oxford Blue #1B263B ΔE 0.050
- Prussian Blue #1D3557 ΔE 0.053
- Midnight Blue #191970 ΔE 0.055
- Space Cadet #2B2D42 ΔE 0.056
- Dark Indigo #1F0954 ΔE 0.061
- Marine Blue #01386A ΔE 0.066
- Dark #1B2431 ΔE 0.068
Use #1B2455 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.