#2B4057
Closest named color: Dark Grey Blue (#29465B). oklch(36.4% 0.048 251.4), rgb(43, 64, 87).
Aa
White text reads best on this color (10.63:1).
About this color
#2B4057 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.048 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.019 away. White text reads best on it, at 10.63:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.048) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.97:1 |
| White text | 10.63:1 |
Values
| HEX | #2B4057 |
| RGB | rgb(43, 64, 87) |
| HSL | hsl(211, 34%, 25%) |
| OKLCH | oklch(36.4% 0.048 251.4) |
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 #2B4057 | 10.63:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #2B4057 | 1.97:1 | Fails | Lc 9.3 | Not readable |
| #2B4057 text on white | 10.63:1 | AAA | Lc 94.6 | Preferred for body text |
| #2B4057 text on black | 1.97:1 | Fails | Lc -8.0 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF1
oklch(93.5% 0.011 256.7)
-
Step 200
200
#D0DAE6
oklch(88.4% 0.02 252.9)
-
Step 300
300
#B0C3D8
oklch(80.9% 0.036 250.9)
-
Step 400
400
#87A4C4
oklch(70.8% 0.057 251.1)
-
Step 500
500
#688DB5
oklch(63.2% 0.073 251)
-
Step 600
600
#4F76A1
oklch(55.5% 0.081 251.7)
-
Step 700
700
#40638A
oklch(49% 0.075 252)
-
Step 800
800
#355170
oklch(42.7% 0.062 251.8)
-
Step 900
900 (this color)
#2B4057
oklch(36.4% 0.048 251.4)
-
Step 950
950
#1B2835
oklch(27.1% 0.03 249)
#2B4057 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) | #374158 | 0.018 |
| Deuteranopia (no green cones) | #313C57 | 0.014 |
| Tritanopia (no blue cones) | #184548 | 0.041 |
| Achromatopsia (no color) | #3E3E3E | 0.048 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B4057
#2B4057
oklch(36.4% 0.048 251.4)
- #4E3A21
#4E3A21
oklch(36.4% 0.048 71.6)
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 #2B4057, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.019
- Charcoal #264653 ΔE 0.023
- Dark Blue Grey #1F3B4D ΔE 0.028
- Onyx #343A40 ΔE 0.040
- Prussian Blue #1D3557 ΔE 0.042
- Charcoal Grey #3C4142 ΔE 0.044
- Midnight Green #073B4C ΔE 0.044
- Gunmetal #293241 ΔE 0.053
Use #2B4057 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.