#33397E
Closest named color: Dark Slate Blue (#483D8B). oklch(37.9% 0.115 275.7), rgb(51, 57, 126).
Aa
White text reads best on this color (10.35:1).
About this color
#33397E is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.115 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.042 away. White text reads best on it, at 10.35:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.02:1 |
| White text | 10.35:1 |
Values
| HEX | #33397E |
| RGB | rgb(51, 57, 126) |
| HSL | hsl(235, 42%, 35%) |
| OKLCH | oklch(37.9% 0.115 275.7) |
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 #33397E | 10.35:1 | AAA | Lc -97.8 | Preferred for body text |
| Black text on #33397E | 2.02:1 | Fails | Lc 10.1 | Not readable |
| #33397E text on white | 10.35:1 | AAA | Lc 93.8 | Preferred for body text |
| #33397E text on black | 2.02:1 | Fails | Lc -8.7 | 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
#E5E9FB
oklch(93.6% 0.025 275.9)
-
Step 200
200
#D0D7FA
oklch(88.5% 0.049 276.4)
-
Step 300
300
#B1BCF9
oklch(80.8% 0.087 276.4)
-
Step 400
400
#8998F6
oklch(70.8% 0.138 275.4)
-
Step 500
500
#6E7BF2
oklch(63.1% 0.176 275.5)
-
Step 600
600
#5960E1
oklch(55.6% 0.193 275.8)
-
Step 700
700
#494EC3
oklch(49% 0.179 275.7)
-
Step 800
800
#3C419E
oklch(42.7% 0.148 275.8)
-
Step 900
900 (this color)
#33397E
oklch(37.9% 0.115 275.7)
-
Step 950
950
#1D2249
oklch(27% 0.072 275)
#33397E 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) | #104380 | 0.041 |
| Deuteranopia (no green cones) | #003D7D | 0.044 |
| Tritanopia (no blue cones) | #044955 | 0.102 |
| Achromatopsia (no color) | #404040 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #33397E
#33397E
oklch(37.9% 0.115 275.7)
- #4F4100
#4F4100
oklch(37.9% 0.078 95.1)
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 #33397E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.042
- Twilight Blue #0A437A ΔE 0.045
- Cobalt #1E488F ΔE 0.049
- Blueberry #464196 ΔE 0.054
- Marine Blue #01386A ΔE 0.061
- Light Navy #155084 ΔE 0.066
- Dusk Blue #26538D ΔE 0.073
- Prussian Blue #1D3557 ΔE 0.076
Use #33397E 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.