#333C65
Closest named color: Dark Grey Blue (#29465B). oklch(36.8% 0.072 273), rgb(51, 60, 101).
Aa
White text reads best on this color (10.63:1).
About this color
#333C65 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.072 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.041 away. White text reads best on it, at 10.63:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.97:1 |
| White text | 10.63:1 |
Values
| HEX | #333C65 |
| RGB | rgb(51, 60, 101) |
| HSL | hsl(229, 33%, 30%) |
| OKLCH | oklch(36.8% 0.072 273) |
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 #333C65 | 10.63:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #333C65 | 1.97:1 | Fails | Lc 9.3 | Not readable |
| #333C65 text on white | 10.63:1 | AAA | Lc 94.6 | Preferred for body text |
| #333C65 text on black | 1.97:1 | Fails | Lc -8.0 | 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
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D2D8ED
oklch(88.4% 0.03 273.1)
-
Step 300
300
#B5BFE4
oklch(80.9% 0.053 273.3)
-
Step 400
400
#8F9DD7
oklch(70.7% 0.087 273.5)
-
Step 500
500
#7484CC
oklch(63.1% 0.11 273.3)
-
Step 600
600
#5D6DB9
oklch(55.7% 0.119 273)
-
Step 700
700
#4D5A9F
oklch(49% 0.111 273.6)
-
Step 800
800
#3F4A81
oklch(42.7% 0.092 273.4)
-
Step 900
900 (this color)
#333C65
oklch(36.8% 0.072 273)
-
Step 950
950
#1F253D
oklch(27.1% 0.046 272.4)
#333C65 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) | #2D4167 | 0.016 |
| Deuteranopia (no green cones) | #283C64 | 0.015 |
| Tritanopia (no blue cones) | #21454B | 0.065 |
| Achromatopsia (no color) | #3E3E3E | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333C65
#333C65
oklch(36.8% 0.072 273)
- #4C3E06
#4C3E06
oklch(36.8% 0.072 93.6)
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 #333C65, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.041
- Prussian Blue #1D3557 ΔE 0.045
- Twilight Blue #0A437A ΔE 0.050
- Marine Blue #01386A ΔE 0.052
- Dark Blue Grey #1F3B4D ΔE 0.052
- Charcoal #264653 ΔE 0.053
- Onyx #343A40 ΔE 0.064
- Midnight Green #073B4C ΔE 0.066
Use #333C65 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.