#33397A
Closest named color: Twilight Blue (#0A437A). oklch(37.6% 0.109 275.9), rgb(51, 57, 122).
Aa
White text reads best on this color (10.46:1).
About this color
#33397A is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.109 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.044 away. White text reads best on it, at 10.46:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.00:1 |
| White text | 10.46:1 |
Values
| HEX | #33397A |
| RGB | rgb(51, 57, 122) |
| HSL | hsl(235, 41%, 34%) |
| OKLCH | oklch(37.6% 0.109 275.9) |
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 #33397A | 10.46:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #33397A | 2.00:1 | Fails | Lc 9.9 | Not readable |
| #33397A text on white | 10.46:1 | AAA | Lc 94.1 | Preferred for body text |
| #33397A text on black | 2.00:1 | Fails | Lc -8.5 | 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
#E5E9FA
oklch(93.6% 0.023 275.4)
-
Step 200
200
#D0D7F8
oklch(88.4% 0.046 276)
-
Step 300
300
#B2BDF6
oklch(81% 0.082 275.9)
-
Step 400
400
#8B98F1
oklch(70.6% 0.131 276.2)
-
Step 500
500
#707CED
oklch(63.1% 0.168 275.9)
-
Step 600
600
#5A62DB
oklch(55.6% 0.182 275.9)
-
Step 700
700
#4A50BE
oklch(49% 0.17 275.8)
-
Step 800
800
#3D429A
oklch(42.7% 0.141 276.2)
-
Step 900
900 (this color)
#33397A
oklch(37.6% 0.109 275.9)
-
Step 950
950
#1E2248
oklch(27% 0.07 276.2)
#33397A 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) | #16427C | 0.037 |
| Deuteranopia (no green cones) | #0A3D79 | 0.040 |
| Tritanopia (no blue cones) | #0C4854 | 0.096 |
| Achromatopsia (no color) | #3F3F3F | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #33397A
#33397A
oklch(37.6% 0.109 275.9)
- #4E4100
#4E4100
oklch(37.8% 0.078 96.2)
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 #33397A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.044
- Dark Slate Blue #483D8B ΔE 0.046
- Cobalt #1E488F ΔE 0.052
- Marine Blue #01386A ΔE 0.057
- Blueberry #464196 ΔE 0.059
- Light Navy #155084 ΔE 0.067
- Prussian Blue #1D3557 ΔE 0.070
- Dark Grey Blue #29465B ΔE 0.074
Use #33397A 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.