#2B4CAB
Closest named color: Cobalt (#1E488F). oklch(45% 0.157 265.8), rgb(43, 76, 171).
Aa
White text reads best on this color (7.70:1).
About this color
#2B4CAB is a dark, vivid blue. In OKLCH its lightness is 45%, its chroma 0.157 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.049 away. White text reads best on it, at 7.70:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | vivid (0.157) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.72:1 |
| White text | 7.70:1 |
Values
| HEX | #2B4CAB |
| RGB | rgb(43, 76, 171) |
| HSL | hsl(225, 60%, 42%) |
| OKLCH | oklch(45% 0.157 265.8) |
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 #2B4CAB | 7.70:1 | AAA | Lc -91.1 | Preferred for body text |
| Black text on #2B4CAB | 2.72:1 | Fails | Lc 17.7 | Dividers and decoration only |
| #2B4CAB text on white | 7.70:1 | AAA | Lc 86.3 | Fine for body text |
| #2B4CAB text on black | 2.72:1 | Fails | Lc -15.8 | Dividers and decoration only |
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
#F1F5FE
oklch(97% 0.013 266.7)
-
Step 100
100
#E1EAFC
oklch(93.6% 0.026 264.4)
-
Step 200
200
#C9D9FC
oklch(88.5% 0.051 265.9)
-
Step 300
300
#A5C0FD
oklch(81% 0.092 265.9)
-
Step 400
400
#759CFC
oklch(70.6% 0.147 266)
-
Step 500
500
#5380FA
oklch(63.1% 0.189 265.9)
-
Step 600
600
#3966E9
oklch(55.7% 0.204 265.6)
-
Step 700
700
#2D53CA
oklch(49% 0.19 265.9)
-
Step 800
800 (this color)
#2B4CAB
oklch(45% 0.157 265.8)
-
Step 900
900
#223B82
oklch(37.6% 0.124 266)
-
Step 950
950
#14234C
oklch(26.9% 0.078 266.1)
#2B4CAB 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) | #0059AE | 0.036 |
| Deuteranopia (no green cones) | #004DA9 | 0.025 |
| Tritanopia (no blue cones) | #006374 | 0.124 |
| Achromatopsia (no color) | #535353 | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B4CAB
#2B4CAB
oklch(45% 0.157 265.8)
- #6C5100
#6C5100
oklch(45.1% 0.092 86.3)
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 #2B4CAB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.049
- Blueberry #464196 ΔE 0.051
- Sapphire #2138AB ΔE 0.051
- Blue Blue #2242C7 ΔE 0.051
- Dusk Blue #26538D ΔE 0.055
- Denim Blue #3B5B92 ΔE 0.065
- Majorelle Blue #3F37C9 ΔE 0.066
- Dark Slate Blue #483D8B ΔE 0.069
Use #2B4CAB 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.