#1B2B61
Closest named color: Marine (#042E60). oklch(31% 0.098 267.9), rgb(27, 43, 97).
Aa
White text reads best on this color (13.42:1).
About this color
#1B2B61 is a dark, moderately saturated blue. In OKLCH its lightness is 31%, its chroma 0.098 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.020 away. White text reads best on it, at 13.42:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.56:1 |
| White text | 13.42:1 |
Values
| HEX | #1B2B61 |
| RGB | rgb(27, 43, 97) |
| HSL | hsl(226, 56%, 24%) |
| OKLCH | oklch(31% 0.098 267.9) |
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 #1B2B61 | 13.42:1 | AAA | Lc -102.8 | Preferred for body text |
| Black text on #1B2B61 | 1.56:1 | Fails | Lc 0.0 | Not readable |
| #1B2B61 text on white | 13.42:1 | AAA | Lc 99.6 | Preferred for body text |
| #1B2B61 text on black | 1.56:1 | 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
#A6BFFF
oklch(80.9% 0.095 267.8)
-
Step 400
400
#789BFF
oklch(70.8% 0.152 267.9)
-
Step 500
500
#577DFF
oklch(63.1% 0.197 268)
-
Step 600
600
#395BFF
oklch(55.6% 0.245 267.9)
-
Step 700
700
#2B45E5
oklch(49% 0.24 267.9)
-
Step 800
800
#233BB9
oklch(42.7% 0.198 267.7)
-
Step 900
900
#203592
oklch(37.7% 0.155 268)
-
Step 950
950 (this color)
#1B2B61
oklch(31% 0.098 267.9)
#1B2B61 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) | #093263 | 0.023 |
| Deuteranopia (no green cones) | #002C60 | 0.023 |
| Tritanopia (no blue cones) | #003841 | 0.081 |
| Achromatopsia (no color) | #2F2F2F | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B2B61
#1B2B61
oklch(31% 0.098 267.9)
- #3E2E00
#3E2E00
oklch(31.1% 0.064 87.7)
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 #1B2B61, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.020
- Prussian Blue #1D3557 ΔE 0.038
- Marine Blue #01386A ΔE 0.040
- Midnight Blue #191970 ΔE 0.051
- Space Cadet #2B2D42 ΔE 0.062
- Dark Blue Grey #1F3B4D ΔE 0.068
- Gunmetal #293241 ΔE 0.069
- Oxford Blue #1B263B ΔE 0.069
Use #1B2B61 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.