#2A3761
Closest named color: Prussian Blue (#1D3557). oklch(34.7% 0.075 269.2), rgb(42, 55, 97).
Aa
White text reads best on this color (11.55:1).
About this color
#2A3761 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.075 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.026 away. White text reads best on it, at 11.55:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.81:1 |
| White text | 11.55:1 |
Values
| HEX | #2A3761 |
| RGB | rgb(42, 55, 97) |
| HSL | hsl(226, 40%, 27%) |
| OKLCH | oklch(34.7% 0.075 269.2) |
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 #2A3761 | 11.55:1 | AAA | Lc -100.2 | Preferred for body text |
| Black text on #2A3761 | 1.81:1 | Fails | Lc 7.4 | Not readable |
| #2A3761 text on white | 11.55:1 | AAA | Lc 96.5 | Preferred for body text |
| #2A3761 text on black | 1.81:1 | Fails | Lc 0.0 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D1D9EF
oklch(88.6% 0.031 269.8)
-
Step 300
300
#B2C0E6
oklch(81% 0.056 269.2)
-
Step 400
400
#8A9EDA
oklch(70.7% 0.091 269.8)
-
Step 500
500
#6D85D0
oklch(63.1% 0.117 269.4)
-
Step 600
600
#566EBD
oklch(55.7% 0.126 269.3)
-
Step 700
700
#465BA3
oklch(49% 0.118 269.4)
-
Step 800
800
#3A4B84
oklch(42.8% 0.097 269.5)
-
Step 900
900 (this color)
#2A3761
oklch(34.7% 0.075 269.2)
-
Step 950
950
#1D253E
oklch(27% 0.048 269.5)
#2A3761 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) | #263C63 | 0.015 |
| Deuteranopia (no green cones) | #203760 | 0.013 |
| Tritanopia (no blue cones) | #0F4047 | 0.067 |
| Achromatopsia (no color) | #393939 | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A3761
#2A3761
oklch(34.7% 0.075 269.2)
- #493700
#493700
oklch(34.7% 0.071 88.2)
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 #2A3761, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.026
- Marine Blue #01386A ΔE 0.038
- Dark Blue Grey #1F3B4D ΔE 0.044
- Marine #042E60 ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.051
- Twilight Blue #0A437A ΔE 0.054
- Midnight Green #073B4C ΔE 0.055
- Gunmetal #293241 ΔE 0.056
Use #2A3761 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.