#333A47
Closest named color: Onyx (#343A40). oklch(34.7% 0.025 262.8), rgb(51, 58, 71).
Aa
White text reads best on this color (11.43:1).
About this color
#333A47 is a dark close to neutral grey. In OKLCH its lightness is 35%, its chroma 0.025. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.012 away. White text reads best on it, at 11.43:1.
| Hue family | Neutrals |
| Lightness | dark (35%) |
| Chroma | close to neutral grey (0.025) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.83:1 |
| White text | 11.43:1 |
Values
| HEX | #333A47 |
| RGB | rgb(51, 58, 71) |
| HSL | hsl(219, 16%, 24%) |
| OKLCH | oklch(34.7% 0.025 262.8) |
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 #333A47 | 11.43:1 | AAA | Lc -100.1 | Preferred for body text |
| Black text on #333A47 | 1.83:1 | Fails | Lc 7.5 | Not readable |
| #333A47 text on white | 11.43:1 | AAA | Lc 96.4 | Preferred for body text |
| #333A47 text on black | 1.83:1 | Fails | Lc 0.0 | 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
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E8EAED
oklch(93.6% 0.005 258.3)
-
Step 200
200
#D5D9E0
oklch(88.4% 0.011 261.8)
-
Step 300
300
#BAC1CD
oklch(80.9% 0.019 261.3)
-
Step 400
400
#97A1B4
oklch(70.7% 0.03 263.4)
-
Step 500
500
#7D8AA1
oklch(63.1% 0.038 261.9)
-
Step 600
600
#67748C
oklch(55.7% 0.041 262.7)
-
Step 700
700
#556177
oklch(49.1% 0.038 262.5)
-
Step 800
800
#464F61
oklch(42.7% 0.032 264.1)
-
Step 900
900 (this color)
#333A47
oklch(34.7% 0.025 262.8)
-
Step 950
950
#22272E
oklch(27.1% 0.015 256.8)
#333A47 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) | #363B48 | 0.006 |
| Deuteranopia (no green cones) | #343947 | 0.004 |
| Tritanopia (no blue cones) | #2E3D3E | 0.023 |
| Achromatopsia (no color) | #3A3A3A | 0.025 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333A47
#333A47
oklch(34.7% 0.025 262.8)
- #40392B
#40392B
oklch(34.8% 0.025 84.5)
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 #333A47, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.012
- Dark Blue Grey #1F3B4D ΔE 0.027
- Charcoal Grey #3C4142 ΔE 0.032
- Gunmetal #293241 ΔE 0.032
- Charcoal #264653 ΔE 0.040
- Dark Grey Blue #29465B ΔE 0.044
- Space Cadet #2B2D42 ΔE 0.045
- Midnight Green #073B4C ΔE 0.045
Use #333A47 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.