#2A4279
Closest named color: Twilight Blue (#0A437A). oklch(39% 0.098 264.5), rgb(42, 66, 121).
Aa
White text reads best on this color (9.75:1).
About this color
#2A4279 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.098 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.025 away. White text reads best on it, at 9.75:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.15:1 |
| White text | 9.75:1 |
Values
| HEX | #2A4279 |
| RGB | rgb(42, 66, 121) |
| HSL | hsl(222, 48%, 32%) |
| OKLCH | oklch(39% 0.098 264.5) |
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 #2A4279 | 9.75:1 | AAA | Lc -96.6 | Preferred for body text |
| Black text on #2A4279 | 2.15:1 | Fails | Lc 11.6 | Not readable |
| #2A4279 text on white | 9.75:1 | AAA | Lc 92.4 | Preferred for body text |
| #2A4279 text on black | 2.15:1 | Fails | Lc -10.0 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CCD9F5
oklch(88.4% 0.041 265.7)
-
Step 300
300
#A9C1F1
oklch(81% 0.073 264)
-
Step 400
400
#7C9FEA
oklch(70.7% 0.117 264.5)
-
Step 500
500
#5B85E4
oklch(63.1% 0.151 264.5)
-
Step 600
600
#426CD2
oklch(55.6% 0.164 264.8)
-
Step 700
700
#345AB6
oklch(49.2% 0.152 264.5)
-
Step 800
800
#2B4A93
oklch(42.7% 0.126 264.4)
-
Step 900
900 (this color)
#2A4279
oklch(39% 0.098 264.5)
-
Step 950
950
#172545
oklch(27% 0.063 264.7)
#2A4279 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) | #29487B | 0.017 |
| Deuteranopia (no green cones) | #1C4178 | 0.015 |
| Tritanopia (no blue cones) | #004E57 | 0.083 |
| Achromatopsia (no color) | #444444 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A4279
#2A4279
oklch(39% 0.098 264.5)
- #594100
#594100
oklch(39.1% 0.08 84.7)
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 #2A4279, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.025
- Cobalt #1E488F ΔE 0.039
- Light Navy #155084 ΔE 0.042
- Deep Sea Blue #015482 ΔE 0.054
- Marine Blue #01386A ΔE 0.055
- Dusk Blue #26538D ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.055
- Dark Grey Blue #29465B ΔE 0.056
Use #2A4279 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.