#2B4F9F
Closest named color: Dusk Blue (#26538D). oklch(44.7% 0.137 263.6), rgb(43, 79, 159).
Aa
White text reads best on this color (7.71:1).
About this color
#2B4F9F is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.137 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.034 away. White text reads best on it, at 7.71:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.72:1 |
| White text | 7.71:1 |
Values
| HEX | #2B4F9F |
| RGB | rgb(43, 79, 159) |
| HSL | hsl(221, 57%, 40%) |
| OKLCH | oklch(44.7% 0.137 263.6) |
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 #2B4F9F | 7.71:1 | AAA | Lc -91.2 | Preferred for body text |
| Black text on #2B4F9F | 2.72:1 | Fails | Lc 17.6 | Dividers and decoration only |
| #2B4F9F text on white | 7.71:1 | AAA | Lc 86.4 | Fine for body text |
| #2B4F9F text on black | 2.72:1 | Fails | Lc -15.6 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CADAF7
oklch(88.5% 0.044 262.4)
-
Step 300
300
#A6C1F5
oklch(80.9% 0.08 263.3)
-
Step 400
400
#779FF0
oklch(70.7% 0.127 263.5)
-
Step 500
500
#5484EB
oklch(63% 0.164 263.6)
-
Step 600
600
#3A6BD9
oklch(55.5% 0.177 263.6)
-
Step 700
700
#2D59BD
oklch(49.2% 0.165 263.6)
-
Step 800
800 (this color)
#2B4F9F
oklch(44.7% 0.137 263.6)
-
Step 900
900
#233E79
oklch(37.7% 0.106 263.6)
-
Step 950
950
#152547
oklch(27.1% 0.067 263.6)
#2B4F9F 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) | #2158A2 | 0.024 |
| Deuteranopia (no green cones) | #004E9D | 0.026 |
| Tritanopia (no blue cones) | #00626F | 0.110 |
| Achromatopsia (no color) | #535353 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B4F9F
#2B4F9F
oklch(44.7% 0.137 263.6)
- #6C4F00
#6C4F00
oklch(44.6% 0.092 84.1)
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 #2B4F9F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.034
- Cobalt #1E488F ΔE 0.035
- Blueberry #464196 ΔE 0.047
- Denim Blue #3B5B92 ΔE 0.048
- Light Navy #155084 ΔE 0.050
- Light Navy Blue #2E5A88 ΔE 0.054
- Twilight #4E518B ΔE 0.055
- Deep Sea Blue #015482 ΔE 0.058
Use #2B4F9F 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.