#333C68
Closest named color: Dark Grey Blue (#29465B). oklch(37% 0.076 273.4), rgb(51, 60, 104).
Aa
White text reads best on this color (10.56:1).
About this color
#333C68 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.076 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.044 away. White text reads best on it, at 10.56:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.98:1 |
| White text | 10.56:1 |
Values
| HEX | #333C68 |
| RGB | rgb(51, 60, 104) |
| HSL | hsl(230, 34%, 30%) |
| OKLCH | oklch(37% 0.076 273.4) |
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 #333C68 | 10.56:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #333C68 | 1.98:1 | Fails | Lc 9.5 | Not readable |
| #333C68 text on white | 10.56:1 | AAA | Lc 94.4 | Preferred for body text |
| #333C68 text on black | 1.98:1 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D2D8EF
oklch(88.5% 0.032 274.1)
-
Step 300
300
#B4BFE6
oklch(80.9% 0.056 272.7)
-
Step 400
400
#8E9DDA
oklch(70.8% 0.091 273.2)
-
Step 500
500
#7383D0
oklch(63% 0.117 273.7)
-
Step 600
600
#5C6CBD
oklch(55.7% 0.127 273.2)
-
Step 700
700
#4C59A3
oklch(49% 0.119 273.7)
-
Step 800
800
#3E4984
oklch(42.6% 0.098 273.6)
-
Step 900
900 (this color)
#333C68
oklch(37% 0.076 273.4)
-
Step 950
950
#1F243E
oklch(26.9% 0.049 274.4)
#333C68 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) | #2B416A | 0.017 |
| Deuteranopia (no green cones) | #263D67 | 0.018 |
| Tritanopia (no blue cones) | #1F454D | 0.067 |
| Achromatopsia (no color) | #3F3F3F | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333C68
#333C68
oklch(37% 0.076 273.4)
- #4D3E00
#4D3E00
oklch(36.9% 0.076 93.4)
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 #333C68, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.044
- Twilight Blue #0A437A ΔE 0.047
- Prussian Blue #1D3557 ΔE 0.048
- Marine Blue #01386A ΔE 0.051
- Dark Blue Grey #1F3B4D ΔE 0.056
- Charcoal #264653 ΔE 0.057
- Dark Slate Blue #483D8B ΔE 0.069
- Onyx #343A40 ΔE 0.069
Use #333C68 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.