#2A457C
Closest named color: Twilight Blue (#0A437A). oklch(39.9% 0.099 263), rgb(42, 69, 124).
Aa
White text reads best on this color (9.37:1).
About this color
#2A457C is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.099 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.027 away. White text reads best on it, at 9.37:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.24:1 |
| White text | 9.37:1 |
Values
| HEX | #2A457C |
| RGB | rgb(42, 69, 124) |
| HSL | hsl(220, 49%, 33%) |
| OKLCH | oklch(39.9% 0.099 263) |
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 #2A457C | 9.37:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #2A457C | 2.24:1 | Fails | Lc 12.5 | Not readable |
| #2A457C text on white | 9.37:1 | AAA | Lc 91.4 | Preferred for body text |
| #2A457C text on black | 2.24:1 | Fails | Lc -10.9 | 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 900.
-
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
#CBDAF5
oklch(88.6% 0.041 262.3)
-
Step 300
300
#A8C1F1
oklch(80.9% 0.074 263.3)
-
Step 400
400
#79A0EB
oklch(70.8% 0.119 262.7)
-
Step 500
500
#5786E4
oklch(63.1% 0.151 262.8)
-
Step 600
600
#3D6DD2
oklch(55.5% 0.165 263)
-
Step 700
700
#2F5BB6
oklch(49.2% 0.153 262.7)
-
Step 800
800
#284B93
oklch(42.8% 0.126 262.8)
-
Step 900
900 (this color)
#2A457C
oklch(39.9% 0.099 263)
-
Step 950
950
#162545
oklch(27% 0.063 263.8)
#2A457C 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) | #2C4B7E | 0.018 |
| Deuteranopia (no green cones) | #1F437B | 0.014 |
| Tritanopia (no blue cones) | #00525A | 0.084 |
| Achromatopsia (no color) | #464646 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A457C
#2A457C
oklch(39.9% 0.099 263)
- #5D4200
#5D4200
oklch(39.8% 0.082 82.1)
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 #2A457C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.027
- Cobalt #1E488F ΔE 0.032
- Light Navy #155084 ΔE 0.034
- Dusk Blue #26538D ΔE 0.045
- Deep Sea Blue #015482 ΔE 0.046
- Dark Slate Blue #483D8B ΔE 0.054
- Dark Grey Blue #29465B ΔE 0.058
- Blueberry #464196 ΔE 0.060
Use #2A457C 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.