#333756
Closest named color: Prussian Blue (#1D3557). oklch(34.8% 0.054 277.6), rgb(51, 55, 86).
Aa
White text reads best on this color (11.52:1).
About this color
#333756 is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.054 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.032 away. White text reads best on it, at 11.52:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.054) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.82:1 |
| White text | 11.52:1 |
Values
| HEX | #333756 |
| RGB | rgb(51, 55, 86) |
| HSL | hsl(233, 26%, 27%) |
| OKLCH | oklch(34.8% 0.054 277.6) |
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 #333756 | 11.52:1 | AAA | Lc -100.2 | Preferred for body text |
| Black text on #333756 | 1.82:1 | Fails | Lc 7.4 | Not readable |
| #333756 text on white | 11.52:1 | AAA | Lc 96.5 | Preferred for body text |
| #333756 text on black | 1.82:1 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E8E9F2
oklch(93.6% 0.012 281.1)
-
Step 200
200
#D5D8E8
oklch(88.5% 0.022 277.5)
-
Step 300
300
#BABFDB
oklch(81% 0.04 277.5)
-
Step 400
400
#969DCA
oklch(70.7% 0.066 277.7)
-
Step 500
500
#7D85BC
oklch(63.2% 0.083 277.4)
-
Step 600
600
#666EA8
oklch(55.6% 0.09 277)
-
Step 700
700
#555C90
oklch(49.2% 0.084 277)
-
Step 800
800
#464B75
oklch(42.7% 0.07 277.8)
-
Step 900
900 (this color)
#333756
oklch(34.8% 0.054 277.6)
-
Step 950
950
#222537
oklch(27% 0.034 276.6)
#333756 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) | #2D3B57 | 0.014 |
| Deuteranopia (no green cones) | #2B3855 | 0.013 |
| Tritanopia (no blue cones) | #293D42 | 0.048 |
| Achromatopsia (no color) | #393939 | 0.054 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333756
#333756
oklch(34.8% 0.054 277.6)
- #423A16
#423A16
oklch(34.8% 0.054 96.9)
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 #333756, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.032
- Dark Blue Grey #1F3B4D ΔE 0.036
- Gunmetal #293241 ΔE 0.042
- Onyx #343A40 ΔE 0.043
- Space Cadet #2B2D42 ΔE 0.046
- Dark Grey Blue #29465B ΔE 0.047
- Charcoal #264653 ΔE 0.052
- Midnight Green #073B4C ΔE 0.053
Use #333756 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.