#2A3B77
Closest named color: Twilight Blue (#0A437A). oklch(37.2% 0.104 269), rgb(42, 59, 119).
Aa
White text reads best on this color (10.55:1).
About this color
#2A3B77 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.104 and its hue 269°. 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 10.55:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.99:1 |
| White text | 10.55:1 |
Values
| HEX | #2A3B77 |
| RGB | rgb(42, 59, 119) |
| HSL | hsl(227, 48%, 32%) |
| OKLCH | oklch(37.2% 0.104 269) |
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 #2A3B77 | 10.55:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #2A3B77 | 1.99:1 | Fails | Lc 9.7 | Not readable |
| #2A3B77 text on white | 10.55:1 | AAA | Lc 94.2 | Preferred for body text |
| #2A3B77 text on black | 1.99:1 | Fails | Lc -8.3 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFA
oklch(93.6% 0.023 266.9)
-
Step 200
200
#CDD9F7
oklch(88.6% 0.043 268.2)
-
Step 300
300
#ACBFF4
oklch(80.9% 0.078 269.3)
-
Step 400
400
#819CEF
oklch(70.7% 0.126 269.3)
-
Step 500
500
#6281E9
oklch(63% 0.16 269)
-
Step 600
600
#4B68D8
oklch(55.6% 0.175 269.1)
-
Step 700
700
#3C56BB
oklch(49.1% 0.162 268.8)
-
Step 800
800
#324797
oklch(42.7% 0.133 269)
-
Step 900
900 (this color)
#2A3B77
oklch(37.2% 0.104 269)
-
Step 950
950
#192447
oklch(27.1% 0.067 268.5)
#2A3B77 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) | #1C4379 | 0.025 |
| Deuteranopia (no green cones) | #0D3C76 | 0.027 |
| Tritanopia (no blue cones) | #004953 | 0.090 |
| Achromatopsia (no color) | #3F3F3F | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A3B77
#2A3B77
oklch(37.2% 0.104 269)
- #513E00
#513E00
oklch(37.4% 0.076 89.1)
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 #2A3B77, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.031
- Marine Blue #01386A ΔE 0.044
- Cobalt #1E488F ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.058
- Prussian Blue #1D3557 ΔE 0.060
- Light Navy #155084 ΔE 0.061
- Dark Grey Blue #29465B ΔE 0.065
- Blueberry #464196 ΔE 0.069
Use #2A3B77 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.