#333A4E
Closest named color: Onyx (#343A40). oklch(35.1% 0.036 269.5), rgb(51, 58, 78).
Aa
White text reads best on this color (11.31:1).
About this color
#333A4E is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.036 and its hue 270°. 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 11.31:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.036) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.85:1 |
| White text | 11.31:1 |
Values
| HEX | #333A4E |
| RGB | rgb(51, 58, 78) |
| HSL | hsl(224, 21%, 25%) |
| OKLCH | oklch(35.1% 0.036 269.5) |
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 #333A4E | 11.31:1 | AAA | Lc -99.9 | Preferred for body text |
| Black text on #333A4E | 1.85:1 | Fails | Lc 7.8 | Not readable |
| #333A4E text on white | 11.31:1 | AAA | Lc 96.1 | Preferred for body text |
| #333A4E text on black | 1.85:1 | 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
#E8EAEF
oklch(93.7% 0.007 268.5)
-
Step 200
200
#D5D9E3
oklch(88.5% 0.014 268.5)
-
Step 300
300
#B9C0D3
oklch(80.8% 0.028 269.6)
-
Step 400
400
#96A0BD
oklch(70.8% 0.044 270.3)
-
Step 500
500
#7C88AC
oklch(63% 0.056 270.4)
-
Step 600
600
#657297
oklch(55.6% 0.06 269.4)
-
Step 700
700
#545F81
oklch(49% 0.056 270.4)
-
Step 800
800
#454E69
oklch(42.7% 0.046 270.1)
-
Step 900
900 (this color)
#333A4E
oklch(35.1% 0.036 269.5)
-
Step 950
950
#222632
oklch(27% 0.023 270.4)
#333A4E 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) | #343C4F | 0.007 |
| Deuteranopia (no green cones) | #31394E | 0.005 |
| Tritanopia (no blue cones) | #2C3E41 | 0.032 |
| Achromatopsia (no color) | #3A3A3A | 0.036 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333A4E
#333A4E
oklch(35.1% 0.036 269.5)
- #423A24
#423A24
oklch(35.1% 0.037 90.3)
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 #333A4E, 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 0.027
- Gunmetal #293241 ΔE 0.036
- Charcoal Grey #3C4142 ΔE 0.039
- Charcoal #264653 ΔE 0.039
- Dark Grey Blue #29465B ΔE 0.039
- Prussian Blue #1D3557 ΔE 0.040
- Space Cadet #2B2D42 ΔE 0.046
Use #333A4E 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.