#1B284F
Closest named color: Marine (#042E60). oklch(28.8% 0.073 267.8), rgb(27, 40, 79).
Aa
White text reads best on this color (14.35:1).
About this color
#1B284F is a dark, moderately saturated blue. In OKLCH its lightness is 29%, its chroma 0.073 and its hue 268°. 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 14.35:1.
| Hue family | Blues |
| Lightness | dark (29%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.46:1 |
| White text | 14.35:1 |
Values
| HEX | #1B284F |
| RGB | rgb(27, 40, 79) |
| HSL | hsl(225, 49%, 21%) |
| OKLCH | oklch(28.8% 0.073 267.8) |
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 #1B284F | 14.35:1 | AAA | Lc -103.9 | Preferred for body text |
| Black text on #1B284F | 1.46:1 | Fails | Lc 0.0 | Not readable |
| #1B284F text on white | 14.35:1 | AAA | Lc 101.0 | Preferred for body text |
| #1B284F text on black | 1.46:1 | 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
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CBD9FA
oklch(88.5% 0.048 267.2)
-
Step 300
300
#A8BFFA
oklch(80.9% 0.088 267.9)
-
Step 400
400
#7B9CF7
oklch(70.7% 0.139 267.7)
-
Step 500
500
#5B80F4
oklch(63.1% 0.178 267.8)
-
Step 600
600
#4366E2
oklch(55.6% 0.193 267.7)
-
Step 700
700
#3554C5
oklch(49.2% 0.18 267.6)
-
Step 800
800
#2C459F
oklch(42.6% 0.149 267.8)
-
Step 900
900
#273B7E
oklch(37.6% 0.116 267.9)
-
Step 950
950 (this color)
#1B284F
oklch(28.8% 0.073 267.8)
#1B284F 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) | #162C50 | 0.013 |
| Deuteranopia (no green cones) | #0E284E | 0.015 |
| Tritanopia (no blue cones) | #003137 | 0.065 |
| Achromatopsia (no color) | #2A2A2A | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B284F
#1B284F
oklch(28.8% 0.073 267.8)
- #372900
#372900
oklch(28.9% 0.059 88.7)
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 #1B284F, 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 0.037
- Space Cadet #2B2D42 ΔE 0.041
- Prussian Blue #1D3557 ΔE 0.042
- Gunmetal #293241 ΔE 0.052
- Dark #1B2431 ΔE 0.055
- Marine Blue #01386A ΔE 0.063
- Midnight Green #073B4C ΔE 0.064
Use #1B284F 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.