#2B4571
Closest named color: Twilight Blue (#0A437A). oklch(39.2% 0.082 260.4), rgb(43, 69, 113).
Aa
White text reads best on this color (9.57:1).
About this color
#2B4571 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.082 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.032 away. White text reads best on it, at 9.57:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.19:1 |
| White text | 9.57:1 |
Values
| HEX | #2B4571 |
| RGB | rgb(43, 69, 113) |
| HSL | hsl(218, 45%, 31%) |
| OKLCH | oklch(39.2% 0.082 260.4) |
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 #2B4571 | 9.57:1 | AAA | Lc -96.3 | Preferred for body text |
| Black text on #2B4571 | 2.19:1 | Fails | Lc 11.9 | Not readable |
| #2B4571 text on white | 9.57:1 | AAA | Lc 92.0 | Preferred for body text |
| #2B4571 text on black | 2.19:1 | Fails | Lc -10.4 | 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
#AAC2E9
oklch(80.9% 0.061 260.1)
-
Step 400
400
#7DA1DE
oklch(70.6% 0.098 260.7)
-
Step 500
500
#5C89D5
oklch(63.2% 0.125 260.4)
-
Step 600
600
#4271C2
oklch(55.6% 0.136 260.5)
-
Step 700
700
#345EA7
oklch(49% 0.126 260.6)
-
Step 800
800
#2B4D88
oklch(42.6% 0.106 260.6)
-
Step 900
900 (this color)
#2B4571
oklch(39.2% 0.082 260.4)
-
Step 950
950
#172640
oklch(27% 0.053 260.8)
#2B4571 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) | #324973 | 0.016 |
| Deuteranopia (no green cones) | #294270 | 0.010 |
| Tritanopia (no blue cones) | #004F55 | 0.072 |
| Achromatopsia (no color) | #454545 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B4571
#2B4571
oklch(39.2% 0.082 260.4)
- #5C4000
#5C4000
oklch(39.3% 0.081 80.5)
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 #2B4571, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.032
- Dark Grey Blue #29465B ΔE 0.040
- Light Navy #155084 ΔE 0.042
- Deep Sea Blue #015482 ΔE 0.050
- Cobalt #1E488F ΔE 0.050
- Charcoal #264653 ΔE 0.054
- Dusk Blue #26538D ΔE 0.056
- Marine Blue #01386A ΔE 0.058
Use #2B4571 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.