#2B4582
Closest named color: Cobalt (#1E488F). oklch(40.3% 0.107 264.7), rgb(43, 69, 130).
Aa
White text reads best on this color (9.22:1).
About this color
#2B4582 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.107 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.024 away. White text reads best on it, at 9.22:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.27:1 |
| White text | 9.22:1 |
Values
| HEX | #2B4582 |
| RGB | rgb(43, 69, 130) |
| HSL | hsl(222, 50%, 34%) |
| OKLCH | oklch(40.3% 0.107 264.7) |
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 #2B4582 | 9.22:1 | AAA | Lc -95.4 | Preferred for body text |
| Black text on #2B4582 | 2.27:1 | Fails | Lc 12.9 | Not readable |
| #2B4582 text on white | 9.22:1 | AAA | Lc 91.0 | Preferred for body text |
| #2B4582 text on black | 2.27:1 | Fails | Lc -11.3 | 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 800.
-
Step 50
50
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CED9F1
oklch(88.4% 0.035 266)
-
Step 300
300
#ADC1EA
oklch(81% 0.062 264.6)
-
Step 400
400
#81A0E0
oklch(70.8% 0.1 264.1)
-
Step 500
500
#6287D7
oklch(63.2% 0.128 264.3)
-
Step 600
600
#4A6FC4
oklch(55.7% 0.139 264.6)
-
Step 700
700
#3B5CAA
oklch(49.1% 0.131 264.8)
-
Step 800
800 (this color)
#2B4582
oklch(40.3% 0.107 264.7)
-
Step 900
900
#2B406E
oklch(37.8% 0.083 264.3)
-
Step 950
950
#192540
oklch(26.8% 0.053 264.9)
#2B4582 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) | #274C84 | 0.020 |
| Deuteranopia (no green cones) | #184481 | 0.019 |
| Tritanopia (no blue cones) | #00535D | 0.089 |
| Achromatopsia (no color) | #474747 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B4582
#2B4582
oklch(40.3% 0.107 264.7)
- #5D4400
#5D4400
oklch(40.3% 0.083 84.7)
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 #2B4582, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.024
- Twilight Blue #0A437A ΔE 0.032
- Light Navy #155084 ΔE 0.034
- Dusk Blue #26538D ΔE 0.041
- Deep Sea Blue #015482 ΔE 0.047
- Dark Slate Blue #483D8B ΔE 0.048
- Blueberry #464196 ΔE 0.052
- Light Navy Blue #2E5A88 ΔE 0.062
Use #2B4582 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.