#333D5E
Closest named color: Dark Grey Blue (#29465B). oklch(36.7% 0.059 270.5), rgb(51, 61, 94).
Aa
White text reads best on this color (10.66:1).
About this color
#333D5E is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.059 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.032 away. White text reads best on it, at 10.66:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.96:1 |
| White text | 10.66:1 |
Values
| HEX | #333D5E |
| RGB | rgb(51, 61, 94) |
| HSL | hsl(226, 30%, 28%) |
| OKLCH | oklch(36.7% 0.059 270.5) |
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 #333D5E | 10.66:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #333D5E | 1.96:1 | Fails | Lc 9.2 | Not readable |
| #333D5E text on white | 10.66:1 | AAA | Lc 94.7 | Preferred for body text |
| #333D5E text on black | 1.96:1 | Fails | Lc -7.9 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D3D9EA
oklch(88.6% 0.024 270.3)
-
Step 300
300
#B6C0DE
oklch(81% 0.044 270.8)
-
Step 400
400
#909FCD
oklch(70.7% 0.07 270.5)
-
Step 500
500
#7587C0
oklch(63.2% 0.089 270.3)
-
Step 600
600
#5E70AD
oklch(55.7% 0.097 270.5)
-
Step 700
700
#4D5D94
oklch(49% 0.091 270.5)
-
Step 800
800
#3F4C78
oklch(42.6% 0.075 270.5)
-
Step 900
900 (this color)
#333D5E
oklch(36.7% 0.059 270.5)
-
Step 950
950
#1F2539
oklch(26.9% 0.038 270.9)
#333D5E 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) | #31405F | 0.009 |
| Deuteranopia (no green cones) | #2E3D5D | 0.008 |
| Tritanopia (no blue cones) | #244449 | 0.053 |
| Achromatopsia (no color) | #3E3E3E | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333D5E
#333D5E
oklch(36.7% 0.059 270.5)
- #4B3D16
#4B3D16
oklch(36.6% 0.059 89.4)
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 #333D5E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.032
- Charcoal #264653 ΔE 0.042
- Dark Blue Grey #1F3B4D ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.043
- Onyx #343A40 ΔE 0.051
- Charcoal Grey #3C4142 ΔE 0.056
- Marine Blue #01386A ΔE 0.056
- Twilight Blue #0A437A ΔE 0.057
Use #333D5E 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.