#2B4153
Closest named color: Charcoal (#264653). oklch(36.5% 0.042 244), rgb(43, 65, 83).
Aa
White text reads best on this color (10.58:1).
About this color
#2B4153 is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.042 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Charcoal (#264653), ΔE 0.017 away. White text reads best on it, at 10.58:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | Charcoal (#264653) |
| Black text | 1.98:1 |
| White text | 10.58:1 |
Values
| HEX | #2B4153 |
| RGB | rgb(43, 65, 83) |
| HSL | hsl(207, 32%, 25%) |
| OKLCH | oklch(36.5% 0.042 244) |
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 #2B4153 | 10.58:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #2B4153 | 1.98:1 | Fails | Lc 9.4 | Not readable |
| #2B4153 text on white | 10.58:1 | AAA | Lc 94.5 | Preferred for body text |
| #2B4153 text on black | 1.98:1 | Fails | Lc -8.1 | 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
#D0DBE4
oklch(88.6% 0.017 242.5)
-
Step 300
300
#B0C3D4
oklch(80.8% 0.032 245.2)
-
Step 400
400
#87A5BE
oklch(70.8% 0.05 243.7)
-
Step 500
500
#688EAE
oklch(63.1% 0.064 244.5)
-
Step 600
600
#4F7899
oklch(55.6% 0.069 243.7)
-
Step 700
700
#3F6583
oklch(49.1% 0.065 243.5)
-
Step 800
800
#35526A
oklch(42.6% 0.053 244.5)
-
Step 900
900 (this color)
#2B4153
oklch(36.5% 0.042 244)
-
Step 950
950
#1B2833
oklch(27% 0.027 244.6)
#2B4153 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) | #394154 | 0.020 |
| Deuteranopia (no green cones) | #343D53 | 0.017 |
| Tritanopia (no blue cones) | #1B4547 | 0.034 |
| Achromatopsia (no color) | #3F3F3F | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B4153
#2B4153
oklch(36.5% 0.042 244)
- #4E3A27
#4E3A27
oklch(36.5% 0.041 64.5)
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 #2B4153, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal #264653 ΔE 0.017
- Dark Grey Blue #29465B ΔE 0.018
- Dark Blue Grey #1F3B4D ΔE 0.027
- Onyx #343A40 ΔE 0.035
- Charcoal Grey #3C4142 ΔE 0.037
- Midnight Green #073B4C ΔE 0.043
- Prussian Blue #1D3557 ΔE 0.047
- Dark Slate Gray #2F4F4F ΔE 0.050
Use #2B4153 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.