#2A539D
Closest named color: Dusk Blue (#26538D). oklch(45.4% 0.129 261.1), rgb(42, 83, 157).
Aa
White text reads best on this color (7.43:1).
About this color
#2A539D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.129 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.027 away. White text reads best on it, at 7.43:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.82:1 |
| White text | 7.43:1 |
Values
| HEX | #2A539D |
| RGB | rgb(42, 83, 157) |
| HSL | hsl(219, 58%, 39%) |
| OKLCH | oklch(45.4% 0.129 261.1) |
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 #2A539D | 7.43:1 | AAA | Lc -90.4 | Preferred for body text |
| Black text on #2A539D | 2.82:1 | Fails | Lc 18.5 | Dividers and decoration only |
| #2A539D text on white | 7.43:1 | AAA | Lc 85.5 | Fine for body text |
| #2A539D text on black | 2.82:1 | Fails | Lc -16.5 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CADAF6
oklch(88.5% 0.042 261.7)
-
Step 300
300
#A5C2F2
oklch(80.9% 0.075 260.4)
-
Step 400
400
#75A0EC
oklch(70.6% 0.122 261.3)
-
Step 500
500
#5187E6
oklch(63.2% 0.155 260.9)
-
Step 600
600
#366ED4
oklch(55.6% 0.168 261.2)
-
Step 700
700
#295BB7
oklch(49% 0.156 261.3)
-
Step 800
800 (this color)
#2A539D
oklch(45.4% 0.129 261.1)
-
Step 900
900
#213F76
oklch(37.6% 0.101 261.4)
-
Step 950
950
#142645
oklch(27.1% 0.063 260.6)
#2A539D 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) | #2C5BA0 | 0.023 |
| Deuteranopia (no green cones) | #12509C | 0.021 |
| Tritanopia (no blue cones) | #006470 | 0.102 |
| Achromatopsia (no color) | #555555 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A539D
#2A539D
oklch(45.4% 0.129 261.1)
- #715000
#715000
oklch(45.5% 0.094 81.1)
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 #2A539D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.027
- Denim Blue #3B5B92 ΔE 0.037
- Cobalt #1E488F ΔE 0.040
- Light Navy Blue #2E5A88 ΔE 0.043
- Light Navy #155084 ΔE 0.046
- Twilight #4E518B ΔE 0.051
- Deep Sea Blue #015482 ΔE 0.053
- Blueberry #464196 ΔE 0.054
Use #2A539D 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.