#2B3357
Closest named color: Prussian Blue (#1D3557). oklch(33.2% 0.065 272.9), rgb(43, 51, 87).
Aa
White text reads best on this color (12.25:1).
About this color
#2B3357 is a dark, muted blue. In OKLCH its lightness is 33%, its chroma 0.065 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.019 away. White text reads best on it, at 12.25:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.71:1 |
| White text | 12.25:1 |
Values
| HEX | #2B3357 |
| RGB | rgb(43, 51, 87) |
| HSL | hsl(229, 34%, 25%) |
| OKLCH | oklch(33.2% 0.065 272.9) |
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 #2B3357 | 12.25:1 | AAA | Lc -101.4 | Preferred for body text |
| Black text on #2B3357 | 1.71:1 | Fails | Lc 0.0 | Not readable |
| #2B3357 text on white | 12.25:1 | AAA | Lc 97.9 | Preferred for body text |
| #2B3357 text on black | 1.71:1 | 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
#D3D8EB
oklch(88.4% 0.027 274.1)
-
Step 300
300
#B6BFE1
oklch(80.9% 0.049 273.6)
-
Step 400
400
#909ED2
oklch(70.7% 0.078 272.6)
-
Step 500
500
#7685C6
oklch(63.1% 0.1 273.3)
-
Step 600
600
#5F6EB2
oklch(55.7% 0.107 273)
-
Step 700
700
#4E5C99
oklch(49.2% 0.099 272.5)
-
Step 800
800
#404B7C
oklch(42.7% 0.083 272.9)
-
Step 900
900 (this color)
#2B3357
oklch(33.2% 0.065 272.9)
-
Step 950
950
#20253A
oklch(27% 0.04 273.2)
#2B3357 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) | #263758 | 0.013 |
| Deuteranopia (no green cones) | #223356 | 0.013 |
| Tritanopia (no blue cones) | #1B3A40 | 0.057 |
| Achromatopsia (no color) | #353535 | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3357
#2B3357
oklch(33.2% 0.065 272.9)
- #413504
#413504
oklch(33.3% 0.065 94.1)
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 #2B3357, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.019
- Dark Blue Grey #1F3B4D ΔE 0.038
- Space Cadet #2B2D42 ΔE 0.038
- Gunmetal #293241 ΔE 0.040
- Marine Blue #01386A ΔE 0.048
- Marine #042E60 ΔE 0.049
- Midnight Green #073B4C ΔE 0.050
- Onyx #343A40 ΔE 0.054
Use #2B3357 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.