#333C55
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.9% 0.045 268.8), rgb(51, 60, 85).
Aa
White text reads best on this color (10.94:1).
About this color
#333C55 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.045 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.032 away. White text reads best on it, at 10.94:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.91:1 |
| White text | 10.94:1 |
Values
| HEX | #333C55 |
| RGB | rgb(51, 60, 85) |
| HSL | hsl(224, 25%, 27%) |
| OKLCH | oklch(35.9% 0.045 268.8) |
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 #333C55 | 10.94:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #333C55 | 1.91:1 | Fails | Lc 8.6 | Not readable |
| #333C55 text on white | 10.94:1 | AAA | Lc 95.3 | Preferred for body text |
| #333C55 text on black | 1.91:1 | Fails | Lc -7.3 | 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
#E7EAF1
oklch(93.7% 0.01 267.4)
-
Step 200
200
#D4D9E6
oklch(88.5% 0.019 269.1)
-
Step 300
300
#B7C0D7
oklch(80.8% 0.034 268.6)
-
Step 400
400
#92A0C3
oklch(70.7% 0.054 267.9)
-
Step 500
500
#7888B4
oklch(63.1% 0.069 268.9)
-
Step 600
600
#6172A0
oklch(55.7% 0.075 268.4)
-
Step 700
700
#505F89
oklch(49.1% 0.07 268.7)
-
Step 800
800
#424E6F
oklch(42.8% 0.057 268.6)
-
Step 900
900 (this color)
#333C55
oklch(35.9% 0.045 268.8)
-
Step 950
950
#212635
oklch(27.1% 0.029 270.1)
#333C55 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) | #343E56 | 0.007 |
| Deuteranopia (no green cones) | #313B54 | 0.005 |
| Tritanopia (no blue cones) | #294145 | 0.040 |
| Achromatopsia (no color) | #3C3C3C | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333C55
#333C55
oklch(35.9% 0.045 268.8)
- #473C20
#473C20
oklch(36% 0.046 88.6)
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 #333C55, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.032
- Dark Grey Blue #29465B ΔE 0.032
- Onyx #343A40 ΔE 0.036
- Charcoal #264653 ΔE 0.036
- Prussian Blue #1D3557 ΔE 0.040
- Charcoal Grey #3C4142 ΔE 0.044
- Gunmetal #293241 ΔE 0.047
- Midnight Green #073B4C ΔE 0.050
Use #333C55 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.