#2A5381
Closest named color: Dusk Blue (#26538D). oklch(43.5% 0.089 252.9), rgb(42, 83, 129).
Aa
White text reads best on this color (7.91:1).
About this color
#2A5381 is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.089 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.020 away. White text reads best on it, at 7.91:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.65:1 |
| White text | 7.91:1 |
Values
| HEX | #2A5381 |
| RGB | rgb(42, 83, 129) |
| HSL | hsl(212, 51%, 34%) |
| OKLCH | oklch(43.5% 0.089 252.9) |
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 #2A5381 | 7.91:1 | AAA | Lc -92.0 | Preferred for body text |
| Black text on #2A5381 | 2.65:1 | Fails | Lc 16.8 | Dividers and decoration only |
| #2A5381 text on white | 7.91:1 | AAA | Lc 87.2 | Fine for body text |
| #2A5381 text on black | 2.65:1 | Fails | Lc -14.9 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF4
oklch(93.7% 0.015 251.2)
-
Step 200
200
#CCDBEC
oklch(88.5% 0.029 251.5)
-
Step 300
300
#A9C3E2
oklch(80.8% 0.052 253)
-
Step 400
400
#7BA4D4
oklch(70.7% 0.084 252.9)
-
Step 500
500
#588DC8
oklch(63.2% 0.106 252.2)
-
Step 600
600
#3D76B5
oklch(55.7% 0.115 252.6)
-
Step 700
700
#2F639C
oklch(49.2% 0.107 252.7)
-
Step 800
800 (this color)
#2A5381
oklch(43.5% 0.089 252.9)
-
Step 900
900
#254366
oklch(37.7% 0.07 253.4)
-
Step 950
950
#16273B
oklch(26.8% 0.044 253.3)
#2A5381 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) | #3F5683 | 0.027 |
| Deuteranopia (no green cones) | #334D80 | 0.019 |
| Tritanopia (no blue cones) | #005E64 | 0.071 |
| Achromatopsia (no color) | #515151 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A5381
#2A5381
oklch(43.5% 0.089 252.9)
- #6F4807
#6F4807
oklch(43.6% 0.09 72.5)
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 #2A5381, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.020
- Light Navy #155084 ΔE 0.021
- Deep Sea Blue #015482 ΔE 0.023
- Light Navy Blue #2E5A88 ΔE 0.023
- Denim Blue #3B5B92 ΔE 0.041
- YInMn Blue #415A77 ΔE 0.041
- Cobalt #1E488F ΔE 0.045
- Dusk #4E5481 ΔE 0.045
Use #2A5381 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.