#2A539B
Closest named color: Dusk Blue (#26538D). oklch(45.2% 0.126 260.8), rgb(42, 83, 155).
Aa
White text reads best on this color (7.47:1).
About this color
#2A539B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.126 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.024 away. White text reads best on it, at 7.47:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.80:1 |
| White text | 7.47:1 |
Values
| HEX | #2A539B |
| RGB | rgb(42, 83, 155) |
| HSL | hsl(218, 57%, 39%) |
| OKLCH | oklch(45.2% 0.126 260.8) |
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 #2A539B | 7.47:1 | AAA | Lc -90.5 | Preferred for body text |
| Black text on #2A539B | 2.80:1 | Fails | Lc 18.4 | Dividers and decoration only |
| #2A539B text on white | 7.47:1 | AAA | Lc 85.7 | Fine for body text |
| #2A539B text on black | 2.80:1 | Fails | Lc -16.4 | 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
#CADAF5
oklch(88.5% 0.041 260.9)
-
Step 300
300
#A6C2F1
oklch(81% 0.073 260.7)
-
Step 400
400
#76A1EA
oklch(70.8% 0.117 260.6)
-
Step 500
500
#5287E4
oklch(63.1% 0.151 260.8)
-
Step 600
600
#366FD2
oklch(55.7% 0.164 260.6)
-
Step 700
700
#295CB6
oklch(49.1% 0.153 260.8)
-
Step 800
800 (this color)
#2A539B
oklch(45.2% 0.126 260.8)
-
Step 900
900
#214075
oklch(37.7% 0.098 260.4)
-
Step 950
950
#142645
oklch(27.1% 0.063 260.6)
#2A539B 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) | #2E5A9E | 0.021 |
| Deuteranopia (no green cones) | #16509A | 0.019 |
| Tritanopia (no blue cones) | #00646F | 0.101 |
| Achromatopsia (no color) | #555555 | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A539B
#2A539B
oklch(45.2% 0.126 260.8)
- #704F00
#704F00
oklch(45.2% 0.093 80.8)
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 #2A539B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.024
- Denim Blue #3B5B92 ΔE 0.036
- Cobalt #1E488F ΔE 0.039
- Light Navy Blue #2E5A88 ΔE 0.041
- Light Navy #155084 ΔE 0.043
- Twilight #4E518B ΔE 0.049
- Deep Sea Blue #015482 ΔE 0.050
- Dusky Blue #475F94 ΔE 0.053
Use #2A539B 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.