#2B4B8C
Closest named color: Cobalt (#1E488F). oklch(42.4% 0.114 262.8), rgb(43, 75, 140).
Aa
White text reads best on this color (8.44:1).
About this color
#2B4B8C is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.114 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.017 away. White text reads best on it, at 8.44:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.48:1 |
| White text | 8.44:1 |
Values
| HEX | #2B4B8C |
| RGB | rgb(43, 75, 140) |
| HSL | hsl(220, 53%, 36%) |
| OKLCH | oklch(42.4% 0.114 262.8) |
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 #2B4B8C | 8.44:1 | AAA | Lc -93.4 | Preferred for body text |
| Black text on #2B4B8C | 2.48:1 | Fails | Lc 15.2 | Dividers and decoration only |
| #2B4B8C text on white | 8.44:1 | AAA | Lc 88.8 | Fine for body text |
| #2B4B8C text on black | 2.48:1 | Fails | Lc -13.4 | 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 800.
-
Step 50
50
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CCDAF2
oklch(88.5% 0.036 261.3)
-
Step 300
300
#AAC1ED
oklch(80.9% 0.067 263.3)
-
Step 400
400
#7DA0E4
oklch(70.7% 0.108 263)
-
Step 500
500
#5C87DC
oklch(63.1% 0.137 262.8)
-
Step 600
600
#426FC9
oklch(55.6% 0.148 262.6)
-
Step 700
700
#345CAE
oklch(49% 0.139 262.8)
-
Step 800
800 (this color)
#2B4B8C
oklch(42.4% 0.114 262.8)
-
Step 900
900
#274071
oklch(37.8% 0.09 262.5)
-
Step 950
950
#172642
oklch(27.1% 0.056 262)
#2B4B8C 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) | #2B528E | 0.020 |
| Deuteranopia (no green cones) | #19498B | 0.018 |
| Tritanopia (no blue cones) | #005A64 | 0.094 |
| Achromatopsia (no color) | #4D4D4D | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B4B8C
#2B4B8C
oklch(42.4% 0.114 262.8)
- #654900
#654900
oklch(42.4% 0.087 83.3)
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 #2B4B8C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.017
- Dusk Blue #26538D ΔE 0.023
- Light Navy #155084 ΔE 0.027
- Deep Sea Blue #015482 ΔE 0.040
- Blueberry #464196 ΔE 0.046
- Light Navy Blue #2E5A88 ΔE 0.047
- Twilight Blue #0A437A ΔE 0.048
- Dark Slate Blue #483D8B ΔE 0.050
Use #2B4B8C 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.