#1B2B5A
Closest named color: Marine (#042E60). oklch(30.4% 0.087 267), rgb(27, 43, 90).
Aa
White text reads best on this color (13.63:1).
About this color
#1B2B5A is a dark, moderately saturated blue. In OKLCH its lightness is 30%, its chroma 0.087 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.022 away. White text reads best on it, at 13.63:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.53:1 |
| White text | 13.63:1 |
Values
| HEX | #1B2B5A |
| RGB | rgb(27, 43, 90) |
| HSL | hsl(225, 54%, 23%) |
| OKLCH | oklch(30.4% 0.087 267) |
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 #1B2B5A | 13.63:1 | AAA | Lc -103.1 | Preferred for body text |
| Black text on #1B2B5A | 1.53:1 | Fails | Lc 0.0 | Not readable |
| #1B2B5A text on white | 13.63:1 | AAA | Lc 100.0 | Preferred for body text |
| #1B2B5A text on black | 1.53:1 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFF
oklch(93.7% 0.03 267.2)
-
Step 200
200
#C9D9FF
oklch(88.6% 0.055 267.2)
-
Step 300
300
#A5BFFF
oklch(80.9% 0.095 267.2)
-
Step 400
400
#769BFF
oklch(70.7% 0.152 267.2)
-
Step 500
500
#547EFF
oklch(63.1% 0.197 267)
-
Step 600
600
#3860F6
oklch(55.6% 0.228 266.9)
-
Step 700
700
#2C4ED7
oklch(49.2% 0.213 267)
-
Step 800
800
#2441AD
oklch(42.7% 0.176 266.8)
-
Step 900
900
#213989
oklch(37.7% 0.137 266.9)
-
Step 950
950 (this color)
#1B2B5A
oklch(30.4% 0.087 267)
#1B2B5A 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) | #12315C | 0.019 |
| Deuteranopia (no green cones) | #052B59 | 0.021 |
| Tritanopia (no blue cones) | #00363E | 0.073 |
| Achromatopsia (no color) | #2E2E2E | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B2B5A
#1B2B5A
oklch(30.4% 0.087 267)
- #3C2C00
#3C2C00
oklch(30.3% 0.062 87)
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 #1B2B5A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.022
- Prussian Blue #1D3557 ΔE 0.033
- Marine Blue #01386A ΔE 0.045
- Space Cadet #2B2D42 ΔE 0.051
- Oxford Blue #1B263B ΔE 0.057
- Gunmetal #293241 ΔE 0.059
- Midnight Blue #191970 ΔE 0.060
- Dark Blue Grey #1F3B4D ΔE 0.062
Use #1B2B5A 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.