#333577
Closest named color: Twilight Blue (#0A437A). oklch(36.6% 0.11 278.1), rgb(51, 53, 119).
Aa
White text reads best on this color (10.95:1).
About this color
#333577 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.110 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 10.95:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.91:1 |
| White text | 10.95:1 |
Values
| HEX | #333577 |
| RGB | rgb(51, 53, 119) |
| HSL | hsl(238, 40%, 33%) |
| OKLCH | oklch(36.6% 0.11 278.1) |
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 #333577 | 10.95:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #333577 | 1.91:1 | Fails | Lc 8.8 | Not readable |
| #333577 text on white | 10.95:1 | AAA | Lc 95.1 | Preferred for body text |
| #333577 text on black | 1.91:1 | Fails | Lc -7.5 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E6E9FA
oklch(93.7% 0.023 277.9)
-
Step 200
200
#D1D7F8
oklch(88.5% 0.046 277.3)
-
Step 300
300
#B4BCF6
oklch(80.9% 0.082 278.3)
-
Step 400
400
#8E97F2
oklch(70.7% 0.133 278.1)
-
Step 500
500
#747AED
oklch(63% 0.17 278.1)
-
Step 600
600
#5F60DB
oklch(55.6% 0.184 278.3)
-
Step 700
700
#4F4EBE
oklch(49% 0.171 278.4)
-
Step 800
800
#40419A
oklch(42.7% 0.142 278.1)
-
Step 900
900 (this color)
#333577
oklch(36.6% 0.11 278.1)
-
Step 950
950
#1F2148
oklch(26.9% 0.071 278.2)
#333577 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) | #0F3F79 | 0.043 |
| Deuteranopia (no green cones) | #023A76 | 0.046 |
| Tritanopia (no blue cones) | #124450 | 0.097 |
| Achromatopsia (no color) | #3C3C3C | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333577
#333577
oklch(36.6% 0.11 278.1)
- #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 #333577, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.053
- Marine Blue #01386A ΔE 0.055
- Cobalt #1E488F ΔE 0.063
- Prussian Blue #1D3557 ΔE 0.065
- Blueberry #464196 ΔE 0.068
- Marine #042E60 ΔE 0.072
- Light Navy #155084 ΔE 0.078
Use #333577 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.