#2B3761
Closest named color: Prussian Blue (#1D3557). oklch(34.8% 0.075 270.1), rgb(43, 55, 97).
Aa
White text reads best on this color (11.52:1).
About this color
#2B3761 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.075 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.027 away. White text reads best on it, at 11.52:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.82:1 |
| White text | 11.52:1 |
Values
| HEX | #2B3761 |
| RGB | rgb(43, 55, 97) |
| HSL | hsl(227, 39%, 27%) |
| OKLCH | oklch(34.8% 0.075 270.1) |
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 #2B3761 | 11.52:1 | AAA | Lc -100.1 | Preferred for body text |
| Black text on #2B3761 | 1.82:1 | Fails | Lc 7.5 | Not readable |
| #2B3761 text on white | 11.52:1 | AAA | Lc 96.4 | Preferred for body text |
| #2B3761 text on black | 1.82:1 | 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 900.
-
Step 50
50
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D1D9EF
oklch(88.6% 0.031 269.8)
-
Step 300
300
#B2C0E6
oklch(81% 0.056 269.2)
-
Step 400
400
#8B9ED9
oklch(70.7% 0.089 270.3)
-
Step 500
500
#6F85CF
oklch(63.1% 0.115 270.3)
-
Step 600
600
#576DBC
oklch(55.5% 0.125 270.2)
-
Step 700
700
#475BA2
oklch(49% 0.116 269.9)
-
Step 800
800
#3B4B84
oklch(42.8% 0.097 270.1)
-
Step 900
900 (this color)
#2B3761
oklch(34.8% 0.075 270.1)
-
Step 950
950
#1D253E
oklch(27% 0.048 269.5)
#2B3761 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) | #263C63 | 0.015 |
| Deuteranopia (no green cones) | #203760 | 0.015 |
| Tritanopia (no blue cones) | #124047 | 0.067 |
| Achromatopsia (no color) | #393939 | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3761
#2B3761
oklch(34.8% 0.075 270.1)
- #483800
#483800
oklch(34.8% 0.071 90.8)
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 #2B3761, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.027
- Marine Blue #01386A ΔE 0.039
- Dark Blue Grey #1F3B4D ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.051
- Marine #042E60 ΔE 0.052
- Twilight Blue #0A437A ΔE 0.054
- Midnight Green #073B4C ΔE 0.056
- Gunmetal #293241 ΔE 0.057
Use #2B3761 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.