#2B3D57
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.7% 0.051 257.5), rgb(43, 61, 87).
Aa
White text reads best on this color (11.00:1).
About this color
#2B3D57 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.051 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.025 away. White text reads best on it, at 11.00:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.90:1 |
| White text | 11.00:1 |
Values
| HEX | #2B3D57 |
| RGB | rgb(43, 61, 87) |
| HSL | hsl(215, 34%, 25%) |
| OKLCH | oklch(35.7% 0.051 257.5) |
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 #2B3D57 | 11.00:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #2B3D57 | 1.90:1 | Fails | Lc 8.5 | Not readable |
| #2B3D57 text on white | 11.00:1 | AAA | Lc 95.4 | Preferred for body text |
| #2B3D57 text on black | 1.90:1 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF1
oklch(93.5% 0.011 256.7)
-
Step 200
200
#D1DAE8
oklch(88.6% 0.022 259.2)
-
Step 300
300
#B1C2DA
oklch(80.9% 0.039 257)
-
Step 400
400
#89A2C7
oklch(70.6% 0.061 258.1)
-
Step 500
500
#6B8BB9
oklch(63.1% 0.079 257.4)
-
Step 600
600
#5375A5
oklch(55.7% 0.085 257.1)
-
Step 700
700
#43628D
oklch(49.1% 0.079 256.7)
-
Step 800
800
#385073
oklch(42.8% 0.066 257.7)
-
Step 900
900 (this color)
#2B3D57
oklch(35.7% 0.051 257.5)
-
Step 950
950
#1C2736
oklch(27% 0.032 256.3)
#2B3D57 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) | #333E58 | 0.012 |
| Deuteranopia (no green cones) | #2E3A56 | 0.010 |
| Tritanopia (no blue cones) | #194346 | 0.046 |
| Achromatopsia (no color) | #3C3C3C | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3D57
#2B3D57
oklch(35.7% 0.051 257.5)
- #4B391B
#4B391B
oklch(35.7% 0.052 78.7)
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 #2B3D57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.025
- Dark Grey Blue #29465B ΔE 0.028
- Charcoal #264653 ΔE 0.032
- Prussian Blue #1D3557 ΔE 0.034
- Onyx #343A40 ΔE 0.040
- Midnight Green #073B4C ΔE 0.041
- Gunmetal #293241 ΔE 0.047
- Charcoal Grey #3C4142 ΔE 0.049
Use #2B3D57 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.