#1B2961
Closest named color: Marine (#042E60). oklch(30.5% 0.101 269.1), rgb(27, 41, 97).
Aa
White text reads best on this color (13.66:1).
About this color
#1B2961 is a dark, moderately saturated blue. In OKLCH its lightness is 30%, its chroma 0.101 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.023 away. White text reads best on it, at 13.66:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.53:1 |
| White text | 13.66:1 |
Values
| HEX | #1B2961 |
| RGB | rgb(27, 41, 97) |
| HSL | hsl(228, 56%, 24%) |
| OKLCH | oklch(30.5% 0.101 269.1) |
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 #1B2961 | 13.66:1 | AAA | Lc -103.1 | Preferred for body text |
| Black text on #1B2961 | 1.53:1 | Fails | Lc 0.0 | Not readable |
| #1B2961 text on white | 13.66:1 | AAA | Lc 99.9 | Preferred for body text |
| #1B2961 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E1EAFF
oklch(93.7% 0.03 267.2)
-
Step 200
200
#CAD8FF
oklch(88.4% 0.056 269.7)
-
Step 300
300
#A7BEFF
oklch(80.8% 0.096 269.2)
-
Step 400
400
#7A9AFF
oklch(70.7% 0.152 269)
-
Step 500
500
#5A7CFF
oklch(63% 0.198 269.1)
-
Step 600
600
#3E5AFF
oklch(55.6% 0.244 269)
-
Step 700
700
#3042E9
oklch(49.2% 0.246 269)
-
Step 800
800
#2738BC
oklch(42.7% 0.204 269.1)
-
Step 900
900
#223394
oklch(37.6% 0.159 269.2)
-
Step 950
950 (this color)
#1B2961
oklch(30.5% 0.101 269.1)
#1B2961 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) | #023163 | 0.028 |
| Deuteranopia (no green cones) | #002A60 | 0.024 |
| Tritanopia (no blue cones) | #003640 | 0.082 |
| Achromatopsia (no color) | #2E2E2E | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B2961
#1B2961
oklch(30.5% 0.101 269.1)
- #3C2D00
#3C2D00
oklch(30.6% 0.062 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 #1B2961, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.023
- Prussian Blue #1D3557 ΔE 0.044
- Marine Blue #01386A ΔE 0.045
- Midnight Blue #191970 ΔE 0.047
- Space Cadet #2B2D42 ΔE 0.064
- Oxford Blue #1B263B ΔE 0.069
- Gunmetal #293241 ΔE 0.072
- Dark Blue Grey #1F3B4D ΔE 0.073
Use #1B2961 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.