#333B43
Closest named color: Onyx (#343A40). oklch(34.8% 0.018 248.3), rgb(51, 59, 67).
Aa
White text reads best on this color (11.36:1).
About this color
#333B43 is a dark close to neutral grey. In OKLCH its lightness is 35%, its chroma 0.018. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.005 away. White text reads best on it, at 11.36:1.
| Hue family | Neutrals |
| Lightness | dark (35%) |
| Chroma | close to neutral grey (0.018) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.84:1 |
| White text | 11.36:1 |
Values
| HEX | #333B43 |
| RGB | rgb(51, 59, 67) |
| HSL | hsl(210, 14%, 23%) |
| OKLCH | oklch(34.8% 0.018 248.3) |
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 #333B43 | 11.36:1 | AAA | Lc -100.0 | Preferred for body text |
| Black text on #333B43 | 1.84:1 | Fails | Lc 7.6 | Not readable |
| #333B43 text on white | 11.36:1 | AAA | Lc 96.2 | Preferred for body text |
| #333B43 text on black | 1.84:1 | 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
#F4F5F6
oklch(97% 0.002 247.8)
-
Step 100
100
#E8EAEC
oklch(93.6% 0.003 247.9)
-
Step 200
200
#D5DADE
oklch(88.6% 0.008 241.7)
-
Step 300
300
#BAC1C9
oklch(80.8% 0.014 251.6)
-
Step 400
400
#97A2AE
oklch(70.7% 0.022 250.5)
-
Step 500
500
#7D8B9A
oklch(63.1% 0.028 250.1)
-
Step 600
600
#667584
oklch(55.5% 0.029 248.4)
-
Step 700
700
#556270
oklch(49% 0.028 250.3)
-
Step 800
800
#45505B
oklch(42.6% 0.023 248.4)
-
Step 900
900 (this color)
#333B43
oklch(34.8% 0.018 248.3)
-
Step 950
950
#22272C
oklch(27% 0.012 248.3)
#333B43 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) | #383B43 | 0.008 |
| Deuteranopia (no green cones) | #363943 | 0.008 |
| Tritanopia (no blue cones) | #2F3D3E | 0.014 |
| Achromatopsia (no color) | #3A3A3A | 0.018 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333B43
#333B43
oklch(34.8% 0.018 248.3)
- #403830
#403830
oklch(34.6% 0.018 67.2)
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 #333B43, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.005
- Charcoal Grey #3C4142 ΔE 0.026
- Dark Blue Grey #1F3B4D ΔE 0.031
- Gunmetal #293241 ΔE 0.035
- Charcoal #264653 ΔE 0.039
- Dark Grey Blue #29465B ΔE 0.046
- Midnight Green #073B4C ΔE 0.047
- Space Cadet #2B2D42 ΔE 0.050
Use #333B43 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.