#333B4D
Closest named color: Onyx (#343A40). oklch(35.3% 0.033 266), rgb(51, 59, 77).
Aa
White text reads best on this color (11.20:1).
About this color
#333B4D is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.033 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.022 away. White text reads best on it, at 11.20:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.033) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.87:1 |
| White text | 11.20:1 |
Values
| HEX | #333B4D |
| RGB | rgb(51, 59, 77) |
| HSL | hsl(222, 20%, 25%) |
| OKLCH | oklch(35.3% 0.033 266) |
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 #333B4D | 11.20:1 | AAA | Lc -99.7 | Preferred for body text |
| Black text on #333B4D | 1.87:1 | Fails | Lc 8.0 | Not readable |
| #333B4D text on white | 11.20:1 | AAA | Lc 95.9 | Preferred for body text |
| #333B4D 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAEF
oklch(93.6% 0.007 260.7)
-
Step 200
200
#D5D9E3
oklch(88.5% 0.014 268.5)
-
Step 300
300
#B9C1D1
oklch(81% 0.024 264.4)
-
Step 400
400
#95A1BA
oklch(70.8% 0.039 265)
-
Step 500
500
#7B89A9
oklch(63% 0.051 266.4)
-
Step 600
600
#647395
oklch(55.6% 0.056 266.1)
-
Step 700
700
#53607F
oklch(49.1% 0.053 266.8)
-
Step 800
800
#444F67
oklch(42.8% 0.042 265.5)
-
Step 900
900 (this color)
#333B4D
oklch(35.3% 0.033 266)
-
Step 950
950
#222631
oklch(27% 0.021 269.3)
#333B4D 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) | #353C4E | 0.005 |
| Deuteranopia (no green cones) | #333A4D | 0.003 |
| Tritanopia (no blue cones) | #2C3F41 | 0.031 |
| Achromatopsia (no color) | #3B3B3B | 0.033 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333B4D
#333B4D
oklch(35.3% 0.033 266)
- #433A27
#433A27
oklch(35.2% 0.033 85.4)
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 #333B4D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.022
- Dark Blue Grey #1F3B4D ΔE 0.027
- Charcoal Grey #3C4142 ΔE 0.035
- Charcoal #264653 ΔE 0.036
- Dark Grey Blue #29465B ΔE 0.037
- Gunmetal #293241 ΔE 0.038
- Prussian Blue #1D3557 ΔE 0.043
- Midnight Green #073B4C ΔE 0.046
Use #333B4D 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.