#2B3151
Closest named color: Prussian Blue (#1D3557). oklch(32.4% 0.058 274.7), rgb(43, 49, 81).
Aa
White text reads best on this color (12.64:1).
About this color
#2B3151 is a dark, muted blue. In OKLCH its lightness is 32%, its chroma 0.058 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.022 away. White text reads best on it, at 12.64:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.66:1 |
| White text | 12.64:1 |
Values
| HEX | #2B3151 |
| RGB | rgb(43, 49, 81) |
| HSL | hsl(231, 31%, 24%) |
| OKLCH | oklch(32.4% 0.058 274.7) |
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 #2B3151 | 12.64:1 | AAA | Lc -102.0 | Preferred for body text |
| Black text on #2B3151 | 1.66:1 | Fails | Lc 0.0 | Not readable |
| #2B3151 text on white | 12.64:1 | AAA | Lc 98.6 | Preferred for body text |
| #2B3151 text on black | 1.66:1 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7E9F2
oklch(93.5% 0.012 276.1)
-
Step 200
200
#D4D8E9
oklch(88.4% 0.024 275.3)
-
Step 300
300
#B8BFDD
oklch(80.9% 0.043 275)
-
Step 400
400
#939ECC
oklch(70.7% 0.069 274.1)
-
Step 500
500
#7985BF
oklch(63% 0.089 274.6)
-
Step 600
600
#636EAB
oklch(55.6% 0.096 275.1)
-
Step 700
700
#525C93
oklch(49.1% 0.089 274.8)
-
Step 800
800
#434B77
oklch(42.6% 0.074 275)
-
Step 900
900 (this color)
#2B3151
oklch(32.4% 0.058 274.7)
-
Step 950
950
#212538
oklch(27% 0.036 274.6)
#2B3151 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) | #263552 | 0.014 |
| Deuteranopia (no green cones) | #233250 | 0.012 |
| Tritanopia (no blue cones) | #1E373D | 0.050 |
| Achromatopsia (no color) | #333333 | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3151
#2B3151
oklch(32.4% 0.058 274.7)
- #3D330B
#3D330B
oklch(32.3% 0.057 94.7)
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 #2B3151, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.022
- Space Cadet #2B2D42 ΔE 0.027
- Gunmetal #293241 ΔE 0.031
- Dark Blue Grey #1F3B4D ΔE 0.037
- Midnight Green #073B4C ΔE 0.048
- Onyx #343A40 ΔE 0.051
- Marine #042E60 ΔE 0.051
- Marine Blue #01386A ΔE 0.055
Use #2B3151 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.