#2B4773
Closest named color: Twilight Blue (#0A437A). oklch(39.8% 0.082 259.1), rgb(43, 71, 115).
Aa
White text reads best on this color (9.32:1).
About this color
#2B4773 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.082 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.033 away. White text reads best on it, at 9.32:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.25:1 |
| White text | 9.32:1 |
Values
| HEX | #2B4773 |
| RGB | rgb(43, 71, 115) |
| HSL | hsl(217, 46%, 31%) |
| OKLCH | oklch(39.8% 0.082 259.1) |
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 #2B4773 | 9.32:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #2B4773 | 2.25:1 | Fails | Lc 12.6 | Not readable |
| #2B4773 text on white | 9.32:1 | AAA | Lc 91.4 | Preferred for body text |
| #2B4773 text on black | 2.25:1 | Fails | Lc -11.0 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF6
oklch(93.5% 0.018 261.3)
-
Step 200
200
#CCDAF0
oklch(88.5% 0.034 259.4)
-
Step 300
300
#A9C2E9
oklch(80.9% 0.062 259.2)
-
Step 400
400
#7BA2DE
oklch(70.7% 0.098 258.8)
-
Step 500
500
#5989D5
oklch(63% 0.127 259.2)
-
Step 600
600
#3F72C2
oklch(55.6% 0.136 259.1)
-
Step 700
700
#315FA8
oklch(49.1% 0.128 259.3)
-
Step 800
800
#294E88
oklch(42.7% 0.106 259.1)
-
Step 900
900 (this color)
#2B4773
oklch(39.8% 0.082 259.1)
-
Step 950
950
#162640
oklch(26.9% 0.053 259.7)
#2B4773 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) | #344A75 | 0.015 |
| Deuteranopia (no green cones) | #2B4472 | 0.009 |
| Tritanopia (no blue cones) | #005157 | 0.071 |
| Achromatopsia (no color) | #474747 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B4773
#2B4773
oklch(39.8% 0.082 259.1)
- #5F4101
#5F4101
oklch(39.9% 0.082 78.7)
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 #2B4773, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.033
- Light Navy #155084 ΔE 0.036
- Dark Grey Blue #29465B ΔE 0.041
- Deep Sea Blue #015482 ΔE 0.044
- Cobalt #1E488F ΔE 0.047
- Dusk Blue #26538D ΔE 0.050
- Charcoal #264653 ΔE 0.056
- Light Navy Blue #2E5A88 ΔE 0.062
Use #2B4773 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.