#333B80
Closest named color: Dark Slate Blue (#483D8B). oklch(38.5% 0.115 274.7), rgb(51, 59, 128).
Aa
White text reads best on this color (10.10:1).
About this color
#333B80 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.115 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.039 away. White text reads best on it, at 10.10:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.07:1 |
| White text | 10.10:1 |
Values
| HEX | #333B80 |
| RGB | rgb(51, 59, 128) |
| HSL | hsl(234, 43%, 35%) |
| OKLCH | oklch(38.5% 0.115 274.7) |
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 #333B80 | 10.10:1 | AAA | Lc -97.3 | Preferred for body text |
| Black text on #333B80 | 2.07:1 | Fails | Lc 10.7 | Not readable |
| #333B80 text on white | 10.10:1 | AAA | Lc 93.2 | Preferred for body text |
| #333B80 text on black | 2.07:1 | Fails | Lc -9.3 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E4E9FB
oklch(93.6% 0.025 273.5)
-
Step 200
200
#CFD7FA
oklch(88.4% 0.049 275.2)
-
Step 300
300
#B0BDF9
oklch(81% 0.086 274.8)
-
Step 400
400
#8798F6
oklch(70.6% 0.139 274.5)
-
Step 500
500
#6C7BF2
oklch(63% 0.177 274.7)
-
Step 600
600
#5661E1
oklch(55.6% 0.192 274.6)
-
Step 700
700
#474FC3
oklch(49% 0.178 274.7)
-
Step 800
800
#3A429E
oklch(42.8% 0.148 274.5)
-
Step 900
900 (this color)
#333B80
oklch(38.5% 0.115 274.7)
-
Step 950
950
#1C2249
oklch(27% 0.072 274)
#333B80 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) | #144582 | 0.038 |
| Deuteranopia (no green cones) | #023E7F | 0.042 |
| Tritanopia (no blue cones) | #004B57 | 0.103 |
| Achromatopsia (no color) | #424242 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333B80
#333B80
oklch(38.5% 0.115 274.7)
- #514300
#514300
oklch(38.6% 0.079 95.5)
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 #333B80, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.039
- Twilight Blue #0A437A ΔE 0.043
- Cobalt #1E488F ΔE 0.043
- Blueberry #464196 ΔE 0.050
- Light Navy #155084 ΔE 0.061
- Marine Blue #01386A ΔE 0.063
- Dusk Blue #26538D ΔE 0.067
- Sapphire #2138AB ΔE 0.074
Use #333B80 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.