#2A3357
Closest named color: Prussian Blue (#1D3557). oklch(33.1% 0.065 271.8), rgb(42, 51, 87).
Aa
White text reads best on this color (12.28:1).
About this color
#2A3357 is a dark, muted blue. In OKLCH its lightness is 33%, its chroma 0.065 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.017 away. White text reads best on it, at 12.28:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.70:1 |
| White text | 12.28:1 |
Values
| HEX | #2A3357 |
| RGB | rgb(42, 51, 87) |
| HSL | hsl(228, 35%, 25%) |
| OKLCH | oklch(33.1% 0.065 271.8) |
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 #2A3357 | 12.28:1 | AAA | Lc -101.4 | Preferred for body text |
| Black text on #2A3357 | 1.70:1 | Fails | Lc 0.0 | Not readable |
| #2A3357 text on white | 12.28:1 | AAA | Lc 97.9 | Preferred for body text |
| #2A3357 text on black | 1.70:1 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6E9F4
oklch(93.5% 0.015 273.8)
-
Step 200
200
#D2D9EC
oklch(88.6% 0.027 269.6)
-
Step 300
300
#B5BFE1
oklch(80.8% 0.049 272.4)
-
Step 400
400
#8F9ED2
oklch(70.7% 0.078 271.8)
-
Step 500
500
#7485C6
oklch(63% 0.1 272.1)
-
Step 600
600
#5D6EB3
oklch(55.6% 0.109 272)
-
Step 700
700
#4D5C9A
oklch(49.2% 0.101 272)
-
Step 800
800
#3F4B7D
oklch(42.7% 0.084 272.2)
-
Step 900
900 (this color)
#2A3357
oklch(33.1% 0.065 271.8)
-
Step 950
950
#1F253B
oklch(27% 0.042 271.7)
#2A3357 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) | #253758 | 0.013 |
| Deuteranopia (no green cones) | #213356 | 0.013 |
| Tritanopia (no blue cones) | #193B40 | 0.059 |
| Achromatopsia (no color) | #353535 | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A3357
#2A3357
oklch(33.1% 0.065 271.8)
- #423404
#423404
oklch(33.1% 0.065 91.2)
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 #2A3357, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.017
- Dark Blue Grey #1F3B4D ΔE 0.037
- Space Cadet #2B2D42 ΔE 0.038
- Gunmetal #293241 ΔE 0.040
- Marine Blue #01386A ΔE 0.047
- Marine #042E60 ΔE 0.048
- Midnight Green #073B4C ΔE 0.049
- Onyx #343A40 ΔE 0.055
Use #2A3357 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.