#2B4580
Closest named color: Cobalt (#1E488F). oklch(40.2% 0.104 264.3), rgb(43, 69, 128).
Aa
White text reads best on this color (9.26:1).
About this color
#2B4580 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.104 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.027 away. White text reads best on it, at 9.26:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.26:1 |
| White text | 9.26:1 |
Values
| HEX | #2B4580 |
| RGB | rgb(43, 69, 128) |
| HSL | hsl(222, 50%, 34%) |
| OKLCH | oklch(40.2% 0.104 264.3) |
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 #2B4580 | 9.26:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #2B4580 | 2.26:1 | Fails | Lc 12.8 | Not readable |
| #2B4580 text on white | 9.26:1 | AAA | Lc 91.2 | Preferred for body text |
| #2B4580 text on black | 2.26:1 | Fails | Lc -11.2 | 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
#CED9F0
oklch(88.4% 0.034 265.2)
-
Step 300
300
#ADC1E9
oklch(80.9% 0.061 264.2)
-
Step 400
400
#82A0DE
oklch(70.7% 0.097 264.2)
-
Step 500
500
#6387D5
oklch(63.1% 0.125 264.4)
-
Step 600
600
#4A6FC2
oklch(55.5% 0.136 264.3)
-
Step 700
700
#3C5DA8
oklch(49.2% 0.126 264.4)
-
Step 800
800 (this color)
#2B4580
oklch(40.2% 0.104 264.3)
-
Step 900
900
#2B406D
oklch(37.7% 0.082 264)
-
Step 950
950
#1A2640
oklch(27.2% 0.051 264.4)
#2B4580 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) | #294B82 | 0.017 |
| Deuteranopia (no green cones) | #1B447F | 0.017 |
| Tritanopia (no blue cones) | #00525C | 0.086 |
| Achromatopsia (no color) | #474747 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B4580
#2B4580
oklch(40.2% 0.104 264.3)
- #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 #2B4580, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.027
- Twilight Blue #0A437A ΔE 0.030
- Light Navy #155084 ΔE 0.033
- Dusk Blue #26538D ΔE 0.042
- Deep Sea Blue #015482 ΔE 0.047
- Dark Slate Blue #483D8B ΔE 0.049
- Blueberry #464196 ΔE 0.054
- Light Navy Blue #2E5A88 ΔE 0.062
Use #2B4580 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.