#2B4155
Closest named color: Dark Grey Blue (#29465B). oklch(36.6% 0.044 246.8), rgb(43, 65, 85).
Aa
White text reads best on this color (10.55:1).
About this color
#2B4155 is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.044 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.017 away. White text reads best on it, at 10.55:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.044) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.99:1 |
| White text | 10.55:1 |
Values
| HEX | #2B4155 |
| RGB | rgb(43, 65, 85) |
| HSL | hsl(209, 33%, 25%) |
| OKLCH | oklch(36.6% 0.044 246.8) |
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 #2B4155 | 10.55:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #2B4155 | 1.99:1 | Fails | Lc 9.5 | Not readable |
| #2B4155 text on white | 10.55:1 | AAA | Lc 94.4 | Preferred for body text |
| #2B4155 text on black | 1.99:1 | Fails | Lc -8.2 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EBF0
oklch(93.7% 0.009 242.8)
-
Step 200
200
#D0DBE5
oklch(88.6% 0.018 245.4)
-
Step 300
300
#B0C3D5
oklch(80.8% 0.033 246.8)
-
Step 400
400
#86A4C1
oklch(70.6% 0.054 247.7)
-
Step 500
500
#678EB1
oklch(63.1% 0.068 246.2)
-
Step 600
600
#4E779D
oklch(55.5% 0.075 247.5)
-
Step 700
700
#3F6486
oklch(49% 0.069 247.4)
-
Step 800
800
#34526D
oklch(42.7% 0.058 246.8)
-
Step 900
900 (this color)
#2B4155
oklch(36.6% 0.044 246.8)
-
Step 950
950
#1B2834
oklch(27.1% 0.029 246.9)
#2B4155 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) | #394156 | 0.020 |
| Deuteranopia (no green cones) | #333D55 | 0.016 |
| Tritanopia (no blue cones) | #1A4648 | 0.037 |
| Achromatopsia (no color) | #3F3F3F | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B4155
#2B4155
oklch(36.6% 0.044 246.8)
- #4F3A25
#4F3A25
oklch(36.6% 0.044 65.7)
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 #2B4155, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.017
- Charcoal #264653 ΔE 0.018
- Dark Blue Grey #1F3B4D ΔE 0.028
- Onyx #343A40 ΔE 0.037
- Charcoal Grey #3C4142 ΔE 0.039
- Midnight Green #073B4C ΔE 0.044
- Prussian Blue #1D3557 ΔE 0.046
- Dark Slate Gray #2F4F4F ΔE 0.051
Use #2B4155 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.