#333C45
Closest named color: Onyx (#343A40). oklch(35.2% 0.02 248.4), rgb(51, 60, 69).
Aa
White text reads best on this color (11.21:1).
About this color
#333C45 is a dark close to neutral grey. In OKLCH its lightness is 35%, its chroma 0.020. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.009 away. White text reads best on it, at 11.21:1.
| Hue family | Neutrals |
| Lightness | dark (35%) |
| Chroma | close to neutral grey (0.020) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.87:1 |
| White text | 11.21:1 |
Values
| HEX | #333C45 |
| RGB | rgb(51, 60, 69) |
| HSL | hsl(210, 15%, 24%) |
| OKLCH | oklch(35.2% 0.02 248.4) |
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 #333C45 | 11.21:1 | AAA | Lc -99.7 | Preferred for body text |
| Black text on #333C45 | 1.87:1 | Fails | Lc 8.0 | Not readable |
| #333C45 text on white | 11.21:1 | AAA | Lc 95.9 | Preferred for body text |
| #333C45 text on black | 1.87:1 | 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
#D5DADE
oklch(88.6% 0.008 241.7)
-
Step 300
300
#B9C2CA
oklch(80.9% 0.015 244.8)
-
Step 400
400
#95A2AF
oklch(70.6% 0.024 248.2)
-
Step 500
500
#7C8B9B
oklch(63% 0.03 250)
-
Step 600
600
#657586
oklch(55.5% 0.033 250)
-
Step 700
700
#536372
oklch(49.2% 0.031 246.7)
-
Step 800
800
#44505D
oklch(42.6% 0.027 250.5)
-
Step 900
900 (this color)
#333C45
oklch(35.2% 0.02 248.4)
-
Step 950
950
#22272C
oklch(27% 0.012 248.3)
#333C45 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) | #393C45 | 0.010 |
| Deuteranopia (no green cones) | #363A45 | 0.008 |
| Tritanopia (no blue cones) | #2E3E3F | 0.016 |
| Achromatopsia (no color) | #3B3B3B | 0.020 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333C45
#333C45
oklch(35.2% 0.02 248.4)
- #423930
#423930
oklch(35.1% 0.02 67.1)
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 #333C45, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.009
- Charcoal Grey #3C4142 ΔE 0.025
- Dark Blue Grey #1F3B4D ΔE 0.030
- Charcoal #264653 ΔE 0.036
- Gunmetal #293241 ΔE 0.038
- Dark Grey Blue #29465B ΔE 0.042
- Midnight Green #073B4C ΔE 0.047
- Space Cadet #2B2D42 ΔE 0.052
Use #333C45 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.