#284151
Closest named color: Charcoal (#264653). oklch(36.2% 0.042 237.6), rgb(40, 65, 81).
Aa
White text reads best on this color (10.68:1).
About this color
#284151 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.042 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Charcoal (#264653), ΔE 0.016 away. White text reads best on it, at 10.68:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | Charcoal (#264653) |
| Black text | 1.96:1 |
| White text | 10.68:1 |
Values
| HEX | #284151 |
| RGB | rgb(40, 65, 81) |
| HSL | hsl(203, 34%, 24%) |
| OKLCH | oklch(36.2% 0.042 237.6) |
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 #284151 | 10.68:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #284151 | 1.96:1 | Fails | Lc 9.2 | Not readable |
| #284151 text on white | 10.68:1 | AAA | Lc 94.7 | Preferred for body text |
| #284151 text on black | 1.96:1 | Fails | Lc -7.9 | 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
#E5EBEF
oklch(93.7% 0.008 236.6)
-
Step 200
200
#CFDBE3
oklch(88.5% 0.017 236.7)
-
Step 300
300
#AFC4D3
oklch(80.9% 0.031 238.9)
-
Step 400
400
#84A6BC
oklch(70.8% 0.049 236.8)
-
Step 500
500
#6490AC
oklch(63.2% 0.064 237.1)
-
Step 600
600
#4A7997
oklch(55.5% 0.069 237.8)
-
Step 700
700
#3B6681
oklch(49.1% 0.065 237.6)
-
Step 800
800
#315369
oklch(42.6% 0.054 238.2)
-
Step 900
900 (this color)
#284151
oklch(36.2% 0.042 237.6)
-
Step 950
950
#1A2832
oklch(26.9% 0.027 240.1)
#284151 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) | #3A4152 | 0.025 |
| Deuteranopia (no green cones) | #343C51 | 0.022 |
| Tritanopia (no blue cones) | #164546 | 0.033 |
| Achromatopsia (no color) | #3E3E3E | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284151
#284151
oklch(36.2% 0.042 237.6)
- #4E3828
#4E3828
oklch(36.1% 0.041 57.1)
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 #284151, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal #264653 ΔE 0.016
- Dark Grey Blue #29465B ΔE 0.021
- Dark Blue Grey #1F3B4D ΔE 0.024
- Onyx #343A40 ΔE 0.033
- Charcoal Grey #3C4142 ΔE 0.037
- Midnight Green #073B4C ΔE 0.039
- Prussian Blue #1D3557 ΔE 0.047
- Dark Teal #014D4E ΔE 0.047
Use #284151 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.