#333C4F
Closest named color: Onyx (#343A40). oklch(35.6% 0.035 264.9), rgb(51, 60, 79).
Aa
White text reads best on this color (11.05:1).
About this color
#333C4F is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.035 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.025 away. White text reads best on it, at 11.05:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.90:1 |
| White text | 11.05:1 |
Values
| HEX | #333C4F |
| RGB | rgb(51, 60, 79) |
| HSL | hsl(221, 22%, 25%) |
| OKLCH | oklch(35.6% 0.035 264.9) |
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 #333C4F | 11.05:1 | AAA | Lc -99.4 | Preferred for body text |
| Black text on #333C4F | 1.90:1 | Fails | Lc 8.3 | Not readable |
| #333C4F text on white | 11.05:1 | AAA | Lc 95.6 | Preferred for body text |
| #333C4F text on black | 1.90:1 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAEF
oklch(93.6% 0.007 260.7)
-
Step 200
200
#D4D9E3
oklch(88.4% 0.015 264.5)
-
Step 300
300
#B8C1D2
oklch(80.9% 0.026 263.3)
-
Step 400
400
#94A1BC
oklch(70.8% 0.042 265)
-
Step 500
500
#7989AB
oklch(63% 0.055 265.1)
-
Step 600
600
#627396
oklch(55.5% 0.058 264.4)
-
Step 700
700
#516080
oklch(49% 0.055 265)
-
Step 800
800
#434F68
oklch(42.8% 0.044 264.6)
-
Step 900
900 (this color)
#333C4F
oklch(35.6% 0.035 264.9)
-
Step 950
950
#212632
oklch(26.9% 0.024 267.1)
#333C4F 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) | #363D50 | 0.006 |
| Deuteranopia (no green cones) | #333B4F | 0.003 |
| Tritanopia (no blue cones) | #2B4042 | 0.033 |
| Achromatopsia (no color) | #3C3C3C | 0.035 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333C4F
#333C4F
oklch(35.6% 0.035 264.9)
- #453B26
#453B26
oklch(35.7% 0.036 85.2)
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 #333C4F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.025
- Dark Blue Grey #1F3B4D ΔE 0.028
- Charcoal #264653 ΔE 0.033
- Dark Grey Blue #29465B ΔE 0.034
- Charcoal Grey #3C4142 ΔE 0.035
- Gunmetal #293241 ΔE 0.041
- Prussian Blue #1D3557 ΔE 0.044
- Midnight Green #073B4C ΔE 0.047
Use #333C4F 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.