#333F5E
Closest named color: Dark Grey Blue (#29465B). oklch(37.1% 0.056 267.5), rgb(51, 63, 94).
Aa
White text reads best on this color (10.43:1).
About this color
#333F5E is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.056 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.026 away. White text reads best on it, at 10.43:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.01:1 |
| White text | 10.43:1 |
Values
| HEX | #333F5E |
| RGB | rgb(51, 63, 94) |
| HSL | hsl(223, 30%, 28%) |
| OKLCH | oklch(37.1% 0.056 267.5) |
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 #333F5E | 10.43:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #333F5E | 2.01:1 | Fails | Lc 9.8 | Not readable |
| #333F5E text on white | 10.43:1 | AAA | Lc 94.2 | Preferred for body text |
| #333F5E text on black | 2.01:1 | Fails | Lc -8.4 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D2D9E9
oklch(88.5% 0.023 266.9)
-
Step 300
300
#B5C0DD
oklch(80.9% 0.043 269)
-
Step 400
400
#8EA0CB
oklch(70.7% 0.066 267)
-
Step 500
500
#7388BE
oklch(63.2% 0.085 267.6)
-
Step 600
600
#5B71AA
oklch(55.6% 0.093 267.3)
-
Step 700
700
#4B5E92
oklch(49% 0.087 267.9)
-
Step 800
800
#3E4D77
oklch(42.7% 0.073 268.3)
-
Step 900
900 (this color)
#333F5E
oklch(37.1% 0.056 267.5)
-
Step 950
950
#1F2638
oklch(27.1% 0.035 267.7)
#333F5E 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) | #34425F | 0.010 |
| Deuteranopia (no green cones) | #303E5D | 0.006 |
| Tritanopia (no blue cones) | #24454A | 0.050 |
| Achromatopsia (no color) | #404040 | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333F5E
#333F5E
oklch(37.1% 0.056 267.5)
- #4D3E1A
#4D3E1A
oklch(37.1% 0.056 86.8)
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 #333F5E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.026
- Charcoal #264653 ΔE 0.037
- Dark Blue Grey #1F3B4D ΔE 0.043
- Prussian Blue #1D3557 ΔE 0.047
- Onyx #343A40 ΔE 0.051
- Charcoal Grey #3C4142 ΔE 0.052
- Twilight Blue #0A437A ΔE 0.057
- Midnight Green #073B4C ΔE 0.059
Use #333F5E 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.