#333C60
Closest named color: Dark Grey Blue (#29465B). oklch(36.5% 0.063 272.3), rgb(51, 60, 96).
Aa
White text reads best on this color (10.73:1).
About this color
#333C60 is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.063 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.036 away. White text reads best on it, at 10.73:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.063) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.95:1 |
| White text | 10.73:1 |
Values
| HEX | #333C60 |
| RGB | rgb(51, 60, 96) |
| HSL | hsl(228, 31%, 29%) |
| OKLCH | oklch(36.5% 0.063 272.3) |
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 #333C60 | 10.73:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #333C60 | 1.95:1 | Fails | Lc 9.1 | Not readable |
| #333C60 text on white | 10.73:1 | AAA | Lc 94.8 | Preferred for body text |
| #333C60 text on black | 1.95:1 | Fails | Lc -7.8 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6E9F3
oklch(93.5% 0.014 272.7)
-
Step 200
200
#D3D8EB
oklch(88.4% 0.027 274.1)
-
Step 300
300
#B6BFE0
oklch(80.8% 0.048 273.3)
-
Step 400
400
#909ED1
oklch(70.7% 0.077 272.4)
-
Step 500
500
#7585C5
oklch(63% 0.098 272.6)
-
Step 600
600
#5E6EB1
oklch(55.5% 0.106 272.4)
-
Step 700
700
#4E5C98
oklch(49.1% 0.098 272.4)
-
Step 800
800
#404B7B
oklch(42.6% 0.081 272.8)
-
Step 900
900 (this color)
#333C60
oklch(36.5% 0.063 272.3)
-
Step 950
950
#20253A
oklch(27% 0.04 273.2)
#333C60 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) | #2F4061 | 0.013 |
| Deuteranopia (no green cones) | #2B3C5F | 0.012 |
| Tritanopia (no blue cones) | #234349 | 0.056 |
| Achromatopsia (no color) | #3E3E3E | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333C60
#333C60
oklch(36.5% 0.063 272.3)
- #4A3D11
#4A3D11
oklch(36.4% 0.063 92.3)
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 #333C60, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.036
- Prussian Blue #1D3557 ΔE 0.042
- Dark Blue Grey #1F3B4D ΔE 0.045
- Charcoal #264653 ΔE 0.047
- Marine Blue #01386A ΔE 0.054
- Twilight Blue #0A437A ΔE 0.055
- Onyx #343A40 ΔE 0.055
- Midnight Green #073B4C ΔE 0.060
Use #333C60 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.