#2A4775
Closest named color: Twilight Blue (#0A437A). oklch(39.9% 0.086 259.3), rgb(42, 71, 117).
Aa
White text reads best on this color (9.30:1).
About this color
#2A4775 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.086 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.031 away. White text reads best on it, at 9.30:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.25:1 |
| White text | 9.30:1 |
Values
| HEX | #2A4775 |
| RGB | rgb(42, 71, 117) |
| HSL | hsl(217, 47%, 31%) |
| OKLCH | oklch(39.9% 0.086 259.3) |
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 #2A4775 | 9.30:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #2A4775 | 2.25:1 | Fails | Lc 12.7 | Not readable |
| #2A4775 text on white | 9.30:1 | AAA | Lc 91.3 | Preferred for body text |
| #2A4775 text on black | 2.25:1 | Fails | Lc -11.0 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CBDAF1
oklch(88.4% 0.036 258.9)
-
Step 300
300
#A8C2EB
oklch(80.9% 0.065 259.4)
-
Step 400
400
#7AA2E1
oklch(70.8% 0.103 259.2)
-
Step 500
500
#5789D8
oklch(63.1% 0.131 259.2)
-
Step 600
600
#3C71C5
oklch(55.5% 0.143 259.3)
-
Step 700
700
#2E5FAB
oklch(49.2% 0.133 259)
-
Step 800
800
#274E8A
oklch(42.8% 0.109 258.8)
-
Step 900
900 (this color)
#2A4775
oklch(39.9% 0.086 259.3)
-
Step 950
950
#162641
oklch(27% 0.055 260.3)
#2A4775 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) | #334B77 | 0.017 |
| Deuteranopia (no green cones) | #294474 | 0.009 |
| Tritanopia (no blue cones) | #005158 | 0.072 |
| Achromatopsia (no color) | #474747 | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A4775
#2A4775
oklch(39.9% 0.086 259.3)
- #5F4100
#5F4100
oklch(39.9% 0.083 79)
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 #2A4775, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.031
- Light Navy #155084 ΔE 0.034
- Deep Sea Blue #015482 ΔE 0.043
- Cobalt #1E488F ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.045
- Dusk Blue #26538D ΔE 0.048
- Charcoal #264653 ΔE 0.059
- Light Navy Blue #2E5A88 ΔE 0.061
Use #2A4775 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.