#333F52
Closest named color: Dark Grey Blue (#29465B). oklch(36.5% 0.037 259.5), rgb(51, 63, 82).
Aa
White text reads best on this color (10.64:1).
About this color
#333F52 is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.037 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.025 away. White text reads best on it, at 10.64:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.037) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.97:1 |
| White text | 10.64:1 |
Values
| HEX | #333F52 |
| RGB | rgb(51, 63, 82) |
| HSL | hsl(217, 23%, 26%) |
| OKLCH | oklch(36.5% 0.037 259.5) |
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 #333F52 | 10.64:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #333F52 | 1.97:1 | Fails | Lc 9.2 | Not readable |
| #333F52 text on white | 10.64:1 | AAA | Lc 94.7 | Preferred for body text |
| #333F52 text on black | 1.97:1 | Fails | Lc -7.9 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAEF
oklch(93.6% 0.007 260.7)
-
Step 200
200
#D3DAE3
oklch(88.6% 0.015 254.6)
-
Step 300
300
#B6C1D3
oklch(80.8% 0.028 260.3)
-
Step 400
400
#91A2BD
oklch(70.8% 0.044 259.6)
-
Step 500
500
#758BAC
oklch(63.2% 0.056 258.3)
-
Step 600
600
#5E7497
oklch(55.5% 0.061 259.5)
-
Step 700
700
#4D6181
oklch(48.9% 0.057 259.6)
-
Step 800
800
#405069
oklch(42.8% 0.046 259.2)
-
Step 900
900 (this color)
#333F52
oklch(36.5% 0.037 259.5)
-
Step 950
950
#202732
oklch(27.1% 0.023 259.3)
#333F52 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) | #384053 | 0.009 |
| Deuteranopia (no green cones) | #353D52 | 0.007 |
| Tritanopia (no blue cones) | #2A4345 | 0.033 |
| Achromatopsia (no color) | #3E3E3E | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333F52
#333F52
oklch(36.5% 0.037 259.5)
- #493C28
#493C28
oklch(36.4% 0.037 78)
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 #333F52, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.025
- Charcoal #264653 ΔE 0.026
- Onyx #343A40 ΔE 0.031
- Dark Blue Grey #1F3B4D ΔE 0.032
- Charcoal Grey #3C4142 ΔE 0.033
- Prussian Blue #1D3557 ΔE 0.049
- Midnight Green #073B4C ΔE 0.050
- Gunmetal #293241 ΔE 0.050
Use #333F52 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.