#333F5D
Closest named color: Dark Grey Blue (#29465B). oklch(37.1% 0.054 267.1), rgb(51, 63, 93).
Aa
White text reads best on this color (10.44:1).
About this color
#333F5D is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.054 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.026 away. White text reads best on it, at 10.44:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.054) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.00:1 |
| White text | 10.44:1 |
Values
| HEX | #333F5D |
| RGB | rgb(51, 63, 93) |
| HSL | hsl(223, 29%, 28%) |
| OKLCH | oklch(37.1% 0.054 267.1) |
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 #333F5D | 10.44:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #333F5D | 2.00:1 | Fails | Lc 9.7 | Not readable |
| #333F5D text on white | 10.44:1 | AAA | Lc 94.2 | Preferred for body text |
| #333F5D text on black | 2.00:1 | Fails | Lc -8.4 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D2D9E9
oklch(88.5% 0.023 266.9)
-
Step 300
300
#B5C0DC
oklch(80.8% 0.041 268.5)
-
Step 400
400
#8EA0CA
oklch(70.7% 0.065 266.7)
-
Step 500
500
#7388BC
oklch(63.1% 0.082 267.1)
-
Step 600
600
#5B71A9
oklch(55.5% 0.091 267.1)
-
Step 700
700
#4B5F91
oklch(49.2% 0.084 266.7)
-
Step 800
800
#3E4D75
oklch(42.6% 0.07 267.7)
-
Step 900
900 (this color)
#333F5D
oklch(37.1% 0.054 267.1)
-
Step 950
950
#1F2637
oklch(27% 0.033 266.9)
#333F5D 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) | #34425E | 0.010 |
| Deuteranopia (no green cones) | #303E5C | 0.006 |
| Tritanopia (no blue cones) | #25454A | 0.048 |
| Achromatopsia (no color) | #404040 | 0.054 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333F5D
#333F5D
oklch(37.1% 0.054 267.1)
- #4C3E1C
#4C3E1C
oklch(37.1% 0.054 87.3)
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 #333F5D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.026
- Charcoal #264653 ΔE 0.036
- Dark Blue Grey #1F3B4D ΔE 0.041
- Prussian Blue #1D3557 ΔE 0.047
- Onyx #343A40 ΔE 0.049
- Charcoal Grey #3C4142 ΔE 0.051
- Midnight Green #073B4C ΔE 0.058
- Twilight Blue #0A437A ΔE 0.058
Use #333F5D 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.