#2B4780
Closest named color: Cobalt (#1E488F). oklch(40.7% 0.102 263), rgb(43, 71, 128).
Aa
White text reads best on this color (9.06:1).
About this color
#2B4780 is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.102 and its hue 263°. 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 9.06:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.31:1 |
| White text | 9.06:1 |
Values
| HEX | #2B4780 |
| RGB | rgb(43, 71, 128) |
| HSL | hsl(220, 50%, 34%) |
| OKLCH | oklch(40.7% 0.102 263) |
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 #2B4780 | 9.06:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #2B4780 | 2.31:1 | Fails | Lc 13.3 | Not readable |
| #2B4780 text on white | 9.06:1 | AAA | Lc 90.6 | Preferred for body text |
| #2B4780 text on black | 2.31:1 | Fails | Lc -11.7 | 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
#F3F6FB
oklch(97.2% 0.007 260.7)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CEDAF0
oklch(88.6% 0.033 262.7)
-
Step 300
300
#ADC1E8
oklch(80.9% 0.06 263.7)
-
Step 400
400
#81A0DC
oklch(70.6% 0.095 263.1)
-
Step 500
500
#6288D3
oklch(63.2% 0.121 263)
-
Step 600
600
#4970C0
oklch(55.6% 0.132 263.2)
-
Step 700
700
#3A5EA6
oklch(49.2% 0.123 262.7)
-
Step 800
800 (this color)
#2B4780
oklch(40.7% 0.102 263)
-
Step 900
900
#2B406B
oklch(37.6% 0.079 263.4)
-
Step 950
950
#19263F
oklch(27% 0.05 262.6)
#2B4780 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) | #2D4D82 | 0.018 |
| Deuteranopia (no green cones) | #1F457F | 0.015 |
| Tritanopia (no blue cones) | #00545D | 0.085 |
| Achromatopsia (no color) | #494949 | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B4780
#2B4780
oklch(40.7% 0.102 263)
- #5F4400
#5F4400
oklch(40.6% 0.083 82.8)
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 #2B4780, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.027
- Light Navy #155084 ΔE 0.029
- Twilight Blue #0A437A ΔE 0.033
- Dusk Blue #26538D ΔE 0.037
- Deep Sea Blue #015482 ΔE 0.042
- Dark Slate Blue #483D8B ΔE 0.051
- Blueberry #464196 ΔE 0.055
- Light Navy Blue #2E5A88 ΔE 0.057
Use #2B4780 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.