#333671
Closest named color: Twilight Blue (#0A437A). oklch(36.3% 0.1 278), rgb(51, 54, 113).
Aa
White text reads best on this color (11.01:1).
About this color
#333671 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.100 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.050 away. White text reads best on it, at 11.01:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.90:1 |
| White text | 11.01:1 |
Values
| HEX | #333671 |
| RGB | rgb(51, 54, 113) |
| HSL | hsl(237, 38%, 32%) |
| OKLCH | oklch(36.3% 0.1 278) |
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 #333671 | 11.01:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #333671 | 1.90:1 | Fails | Lc 8.6 | Not readable |
| #333671 text on white | 11.01:1 | AAA | Lc 95.3 | Preferred for body text |
| #333671 text on black | 1.90:1 | Fails | Lc -7.4 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E6E9F9
oklch(93.6% 0.022 277.5)
-
Step 200
200
#D2D7F5
oklch(88.5% 0.042 278)
-
Step 300
300
#B5BDF1
oklch(81% 0.074 277.8)
-
Step 400
400
#8F98EA
oklch(70.6% 0.12 278.1)
-
Step 500
500
#757DE4
oklch(63.1% 0.153 277.7)
-
Step 600
600
#6064D2
oklch(55.7% 0.166 278)
-
Step 700
700
#4F52B6
oklch(49.1% 0.155 277.8)
-
Step 800
800
#414493
oklch(42.8% 0.127 277.9)
-
Step 900
900 (this color)
#333671
oklch(36.3% 0.1 278)
-
Step 950
950
#202245
oklch(27% 0.064 278.7)
#333671 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) | #1A3F73 | 0.036 |
| Deuteranopia (no green cones) | #123A70 | 0.038 |
| Tritanopia (no blue cones) | #18434E | 0.087 |
| Achromatopsia (no color) | #3C3C3C | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333671
#333671
oklch(36.3% 0.1 278)
- #493E00
#493E00
oklch(36.4% 0.075 97.9)
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 #333671, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.050
- Marine Blue #01386A ΔE 0.051
- Prussian Blue #1D3557 ΔE 0.056
- Dark Slate Blue #483D8B ΔE 0.059
- Cobalt #1E488F ΔE 0.067
- Marine #042E60 ΔE 0.068
- Dark Grey Blue #29465B ΔE 0.069
- Blueberry #464196 ΔE 0.074
Use #333671 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.