#2B4A8B
Closest named color: Cobalt (#1E488F). oklch(42.1% 0.114 263.2), rgb(43, 74, 139).
Aa
White text reads best on this color (8.55:1).
About this color
#2B4A8B 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 0.016 away. White text reads best on it, at 8.55:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.45:1 |
| White text | 8.55:1 |
Values
| HEX | #2B4A8B |
| RGB | rgb(43, 74, 139) |
| HSL | hsl(221, 53%, 36%) |
| OKLCH | oklch(42.1% 0.114 263.2) |
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 #2B4A8B | 8.55:1 | AAA | Lc -93.7 | Preferred for body text |
| Black text on #2B4A8B | 2.45:1 | Fails | Lc 14.8 | Not readable |
| #2B4A8B text on white | 8.55:1 | AAA | Lc 89.1 | Fine for body text |
| #2B4A8B text on black | 2.45:1 | Fails | Lc -13.1 | 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
#7DA0E3
oklch(70.7% 0.106 262.8)
-
Step 500
500
#5D87DC
oklch(63.2% 0.137 263.2)
-
Step 600
600
#446FC9
oklch(55.7% 0.148 263.2)
-
Step 700
700
#355CAE
oklch(49.1% 0.138 263.1)
-
Step 800
800 (this color)
#2B4A8B
oklch(42.1% 0.114 263.2)
-
Step 900
900
#284070
oklch(37.8% 0.088 262.8)
-
Step 950
950
#182642
oklch(27.2% 0.056 263.1)
#2B4A8B 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) | #2A518D | 0.020 |
| Deuteranopia (no green cones) | #18488A | 0.019 |
| Tritanopia (no blue cones) | #005963 | 0.094 |
| Achromatopsia (no color) | #4C4C4C | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B4A8B
#2B4A8B
oklch(42.1% 0.114 263.2)
- #644800
#644800
oklch(42.1% 0.087 83)
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 #2B4A8B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.016
- Dusk Blue #26538D ΔE 0.025
- Light Navy #155084 ΔE 0.027
- Deep Sea Blue #015482 ΔE 0.041
- Twilight Blue #0A437A ΔE 0.045
- Blueberry #464196 ΔE 0.046
- Dark Slate Blue #483D8B ΔE 0.049
- Light Navy Blue #2E5A88 ΔE 0.049
Use #2B4A8B 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.