#333A42
Closest named color: Onyx (#343A40). oklch(34.5% 0.017 251.8), rgb(51, 58, 66).
Aa
White text reads best on this color (11.50:1).
About this color
#333A42 is a dark close to neutral grey. In OKLCH its lightness is 35%, its chroma 0.017. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.004 away. White text reads best on it, at 11.50:1.
| Hue family | Neutrals |
| Lightness | dark (35%) |
| Chroma | close to neutral grey (0.017) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.82:1 |
| White text | 11.50:1 |
Values
| HEX | #333A42 |
| RGB | rgb(51, 58, 66) |
| HSL | hsl(212, 13%, 23%) |
| OKLCH | oklch(34.5% 0.017 251.8) |
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 #333A42 | 11.50:1 | AAA | Lc -100.2 | Preferred for body text |
| Black text on #333A42 | 1.82:1 | Fails | Lc 7.4 | Not readable |
| #333A42 text on white | 11.50:1 | AAA | Lc 96.5 | Preferred for body text |
| #333A42 text on black | 1.82:1 | 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
#F5F5F6
oklch(97% 0.001 286.4)
-
Step 100
100
#E8EAEC
oklch(93.6% 0.003 247.9)
-
Step 200
200
#D6D9DE
oklch(88.4% 0.008 260.7)
-
Step 300
300
#BBC1C9
oklch(80.9% 0.013 255.5)
-
Step 400
400
#98A2AD
oklch(70.8% 0.02 250.7)
-
Step 500
500
#7E8B99
oklch(63.1% 0.026 250.2)
-
Step 600
600
#687584
oklch(55.7% 0.028 252.1)
-
Step 700
700
#566270
oklch(49.1% 0.027 252.4)
-
Step 800
800
#47505B
oklch(42.7% 0.022 253.5)
-
Step 900
900 (this color)
#333A42
oklch(34.5% 0.017 251.8)
-
Step 950
950
#23272C
oklch(27.1% 0.011 254)
#333A42 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) | #373A42 | 0.006 |
| Deuteranopia (no green cones) | #353942 | 0.004 |
| Tritanopia (no blue cones) | #2F3C3D | 0.014 |
| Achromatopsia (no color) | #393939 | 0.017 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333A42
#333A42
oklch(34.5% 0.017 251.8)
- #3F3830
#3F3830
oklch(34.5% 0.017 70.9)
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 #333A42, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.004
- Charcoal Grey #3C4142 ΔE 0.029
- Dark Blue Grey #1F3B4D ΔE 0.031
- Gunmetal #293241 ΔE 0.033
- Charcoal #264653 ΔE 0.042
- Midnight Green #073B4C ΔE 0.047
- Space Cadet #2B2D42 ΔE 0.047
- Dark Grey Blue #29465B ΔE 0.049
Use #333A42 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.