#333B65
Closest named color: Dark Grey Blue (#29465B). oklch(36.6% 0.073 274.1), rgb(51, 59, 101).
Aa
White text reads best on this color (10.74:1).
About this color
#333B65 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.073 and its hue 274°. 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 10.74:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.95:1 |
| White text | 10.74:1 |
Values
| HEX | #333B65 |
| RGB | rgb(51, 59, 101) |
| HSL | hsl(230, 33%, 30%) |
| OKLCH | oklch(36.6% 0.073 274.1) |
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 #333B65 | 10.74:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #333B65 | 1.95:1 | Fails | Lc 9.1 | Not readable |
| #333B65 text on white | 10.74:1 | AAA | Lc 94.8 | Preferred for body text |
| #333B65 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D2D8EE
oklch(88.4% 0.031 273.6)
-
Step 300
300
#B5BFE5
oklch(81% 0.055 273.5)
-
Step 400
400
#8F9DD8
oklch(70.7% 0.088 273.7)
-
Step 500
500
#7584CD
oklch(63.2% 0.111 274)
-
Step 600
600
#5E6CBA
oklch(55.6% 0.122 274.1)
-
Step 700
700
#4E5AA0
oklch(49.2% 0.112 274.2)
-
Step 800
800
#404A82
oklch(42.8% 0.093 274.2)
-
Step 900
900 (this color)
#333B65
oklch(36.6% 0.073 274.1)
-
Step 950
950
#1F243D
oklch(26.8% 0.047 274.2)
#333B65 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) | #2B4067 | 0.017 |
| Deuteranopia (no green cones) | #273C64 | 0.017 |
| Tritanopia (no blue cones) | #21444B | 0.065 |
| Achromatopsia (no color) | #3E3E3E | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333B65
#333B65
oklch(36.6% 0.073 274.1)
- #4B3E03
#4B3E03
oklch(36.7% 0.073 95.2)
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 #333B65, 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
- Prussian Blue #1D3557 ΔE 0.044
- Twilight Blue #0A437A ΔE 0.051
- Marine Blue #01386A ΔE 0.051
- Dark Blue Grey #1F3B4D ΔE 0.052
- Charcoal #264653 ΔE 0.055
- Onyx #343A40 ΔE 0.065
- Midnight Green #073B4C ΔE 0.067
Use #333B65 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.