#33317A
Closest named color: Dark Slate Blue (#483D8B). oklch(36% 0.121 279.7), rgb(51, 49, 122).
Aa
White text reads best on this color (11.28:1).
About this color
#33317A is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.121 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.056 away. White text reads best on it, at 11.28:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.86:1 |
| White text | 11.28:1 |
Values
| HEX | #33317A |
| RGB | rgb(51, 49, 122) |
| HSL | hsl(242, 43%, 34%) |
| OKLCH | oklch(36% 0.121 279.7) |
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 #33317A | 11.28:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #33317A | 1.86:1 | Fails | Lc 8.2 | Not readable |
| #33317A text on white | 11.28:1 | AAA | Lc 95.7 | Preferred for body text |
| #33317A text on black | 1.86:1 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E6E8FC
oklch(93.5% 0.027 281.3)
-
Step 200
200
#D2D6FB
oklch(88.5% 0.051 280.4)
-
Step 300
300
#B4BBFB
oklch(80.9% 0.091 279.3)
-
Step 400
400
#8F95F9
oklch(70.8% 0.145 279.4)
-
Step 500
500
#7676F5
oklch(63% 0.185 279.7)
-
Step 600
600
#615BE4
oklch(55.5% 0.201 279.5)
-
Step 700
700
#514AC6
oklch(49.1% 0.186 279.5)
-
Step 800
800
#423DA0
oklch(42.6% 0.155 279.8)
-
Step 900
900 (this color)
#33317A
oklch(36% 0.121 279.7)
-
Step 950
950
#20204A
oklch(26.9% 0.076 280)
#33317A 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) | #003D7C | 0.052 |
| Deuteranopia (no green cones) | #003878 | 0.050 |
| Tritanopia (no blue cones) | #0E4250 | 0.104 |
| Achromatopsia (no color) | #3B3B3B | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #33317A
#33317A
oklch(36% 0.121 279.7)
- #473D00
#473D00
oklch(35.9% 0.074 98.8)
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 #33317A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.056
- Twilight Blue #0A437A ΔE 0.058
- Marine Blue #01386A ΔE 0.059
- Cobalt #1E488F ΔE 0.068
- Blueberry #464196 ΔE 0.070
- Prussian Blue #1D3557 ΔE 0.071
- Marine #042E60 ΔE 0.073
- Midnight Blue #191970 ΔE 0.077
Use #33317A 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.