#2A4873
Closest named color: Twilight Blue (#0A437A). oklch(40% 0.081 257.5), rgb(42, 72, 115).
Aa
White text reads best on this color (9.23:1).
About this color
#2A4873 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.081 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.034 away. White text reads best on it, at 9.23:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.081) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.27:1 |
| White text | 9.23:1 |
Values
| HEX | #2A4873 |
| RGB | rgb(42, 72, 115) |
| HSL | hsl(215, 46%, 31%) |
| OKLCH | oklch(40% 0.081 257.5) |
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 #2A4873 | 9.23:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #2A4873 | 2.27:1 | Fails | Lc 12.8 | Not readable |
| #2A4873 text on white | 9.23:1 | AAA | Lc 91.1 | Preferred for body text |
| #2A4873 text on black | 2.27:1 | Fails | Lc -11.2 | 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 900.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EBF6
oklch(93.7% 0.017 256.3)
-
Step 200
200
#CBDAF0
oklch(88.4% 0.034 257.9)
-
Step 300
300
#A8C3E8
oklch(81% 0.06 256.3)
-
Step 400
400
#7AA2DD
oklch(70.6% 0.098 258)
-
Step 500
500
#578AD4
oklch(63.1% 0.125 257.7)
-
Step 600
600
#3B73C1
oklch(55.6% 0.135 257.2)
-
Step 700
700
#2D60A7
oklch(49.1% 0.126 257.3)
-
Step 800
800
#274F87
oklch(42.8% 0.104 257.3)
-
Step 900
900 (this color)
#2A4873
oklch(40% 0.081 257.5)
-
Step 950
950
#16273F
oklch(27.1% 0.05 257.1)
#2A4873 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) | #364B75 | 0.018 |
| Deuteranopia (no green cones) | #2C4472 | 0.012 |
| Tritanopia (no blue cones) | #005258 | 0.069 |
| Achromatopsia (no color) | #474747 | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A4873
#2A4873
oklch(40% 0.081 257.5)
- #604104
#604104
oklch(40% 0.081 77.1)
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 #2A4873, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.034
- Light Navy #155084 ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.041
- Deep Sea Blue #015482 ΔE 0.042
- Cobalt #1E488F ΔE 0.048
- Dusk Blue #26538D ΔE 0.049
- Charcoal #264653 ΔE 0.055
- Light Navy Blue #2E5A88 ΔE 0.060
Use #2A4873 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.