#2B4A8F
Closest named color: Cobalt (#1E488F). oklch(42.4% 0.12 263.8), rgb(43, 74, 143).
Aa
White text reads best on this color (8.47:1).
About this color
#2B4A8F is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.120 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.014 away. White text reads best on it, at 8.47:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.47:1 |
| White text | 8.47:1 |
Values
| HEX | #2B4A8F |
| RGB | rgb(43, 74, 143) |
| HSL | hsl(221, 54%, 36%) |
| OKLCH | oklch(42.4% 0.12 263.8) |
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 #2B4A8F | 8.47:1 | AAA | Lc -93.5 | Preferred for body text |
| Black text on #2B4A8F | 2.47:1 | Fails | Lc 15.1 | Dividers and decoration only |
| #2B4A8F text on white | 8.47:1 | AAA | Lc 88.9 | Fine for body text |
| #2B4A8F text on black | 2.47:1 | Fails | Lc -13.3 | 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
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CCDAF4
oklch(88.6% 0.039 262.9)
-
Step 300
300
#AAC1EF
oklch(81% 0.07 264.1)
-
Step 400
400
#7C9FE7
oklch(70.6% 0.113 263.9)
-
Step 500
500
#5C86E0
oklch(63.2% 0.144 263.9)
-
Step 600
600
#426ECD
oklch(55.6% 0.155 263.5)
-
Step 700
700
#345BB2
oklch(49.1% 0.145 263.7)
-
Step 800
800 (this color)
#2B4A8F
oklch(42.4% 0.12 263.8)
-
Step 900
900
#273F73
oklch(37.7% 0.094 263.8)
-
Step 950
950
#172543
oklch(26.9% 0.059 264)
#2B4A8F 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) | #265292 | 0.022 |
| Deuteranopia (no green cones) | #10498E | 0.022 |
| Tritanopia (no blue cones) | #005A65 | 0.098 |
| Achromatopsia (no color) | #4D4D4D | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B4A8F
#2B4A8F
oklch(42.4% 0.12 263.8)
- #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 #2B4A8F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.014
- Dusk Blue #26538D ΔE 0.026
- Light Navy #155084 ΔE 0.032
- Blueberry #464196 ΔE 0.043
- Deep Sea Blue #015482 ΔE 0.045
- Dark Slate Blue #483D8B ΔE 0.048
- Twilight Blue #0A437A ΔE 0.050
- Light Navy Blue #2E5A88 ΔE 0.051
Use #2B4A8F 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.