#2B4B89
Closest named color: Cobalt (#1E488F). oklch(42.2% 0.11 262.2), rgb(43, 75, 137).
Aa
White text reads best on this color (8.50:1).
About this color
#2B4B89 is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.110 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.019 away. White text reads best on it, at 8.50:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.47:1 |
| White text | 8.50:1 |
Values
| HEX | #2B4B89 |
| RGB | rgb(43, 75, 137) |
| HSL | hsl(220, 52%, 35%) |
| OKLCH | oklch(42.2% 0.11 262.2) |
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 #2B4B89 | 8.50:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #2B4B89 | 2.47:1 | Fails | Lc 15.0 | Not readable |
| #2B4B89 text on white | 8.50:1 | AAA | Lc 89.0 | Fine for body text |
| #2B4B89 text on black | 2.47:1 | Fails | Lc -13.2 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CDDAF1
oklch(88.6% 0.035 262)
-
Step 300
300
#AAC1EB
oklch(80.8% 0.065 262.4)
-
Step 400
400
#7DA0E1
oklch(70.6% 0.103 262.3)
-
Step 500
500
#5D88D8
oklch(63.2% 0.13 261.9)
-
Step 600
600
#4370C6
oklch(55.6% 0.143 262)
-
Step 700
700
#355DAB
oklch(49.1% 0.133 262.2)
-
Step 800
800 (this color)
#2B4B89
oklch(42.2% 0.11 262.2)
-
Step 900
900
#28406F
oklch(37.7% 0.086 262.6)
-
Step 950
950
#182641
oklch(27.1% 0.054 262.5)
#2B4B89 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) | #2D518B | 0.018 |
| Deuteranopia (no green cones) | #1D4988 | 0.015 |
| Tritanopia (no blue cones) | #005963 | 0.090 |
| Achromatopsia (no color) | #4D4D4D | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B4B89
#2B4B89
oklch(42.2% 0.11 262.2)
- #654800
#654800
oklch(42.2% 0.087 82.1)
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 #2B4B89, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.019
- Dusk Blue #26538D ΔE 0.023
- Light Navy #155084 ΔE 0.024
- Deep Sea Blue #015482 ΔE 0.037
- Twilight Blue #0A437A ΔE 0.045
- Light Navy Blue #2E5A88 ΔE 0.046
- Blueberry #464196 ΔE 0.049
- Dark Slate Blue #483D8B ΔE 0.051
Use #2B4B89 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.