#33397B
Closest named color: Twilight Blue (#0A437A). oklch(37.7% 0.111 275.8), rgb(51, 57, 123).
Aa
White text reads best on this color (10.43:1).
About this color
#33397B is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.111 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 10.43:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.01:1 |
| White text | 10.43:1 |
Values
| HEX | #33397B |
| RGB | rgb(51, 57, 123) |
| HSL | hsl(235, 41%, 34%) |
| OKLCH | oklch(37.7% 0.111 275.8) |
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 #33397B | 10.43:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #33397B | 2.01:1 | Fails | Lc 9.9 | Not readable |
| #33397B text on white | 10.43:1 | AAA | Lc 94.0 | Preferred for body text |
| #33397B text on black | 2.01:1 | Fails | Lc -8.6 | 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
#B1BDF7
oklch(81% 0.083 275.3)
-
Step 400
400
#8A98F3
oklch(70.7% 0.134 275.8)
-
Step 500
500
#6F7CEE
oklch(63.1% 0.17 275.5)
-
Step 600
600
#5A62DC
oklch(55.7% 0.183 275.9)
-
Step 700
700
#4A50BF
oklch(49.1% 0.171 275.8)
-
Step 800
800
#3C429B
oklch(42.7% 0.143 275.6)
-
Step 900
900 (this color)
#33397B
oklch(37.7% 0.111 275.8)
-
Step 950
950
#1E2248
oklch(27% 0.07 276.2)
#33397B 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) | #15437D | 0.039 |
| Deuteranopia (no green cones) | #073D7A | 0.042 |
| Tritanopia (no blue cones) | #0A4854 | 0.097 |
| Achromatopsia (no color) | #404040 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #33397B
#33397B
oklch(37.7% 0.111 275.8)
- #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 #33397B, 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 0.045
- Cobalt #1E488F ΔE 0.052
- Marine Blue #01386A ΔE 0.058
- Blueberry #464196 ΔE 0.058
- Light Navy #155084 ΔE 0.067
- Prussian Blue #1D3557 ΔE 0.071
- Dusk Blue #26538D ΔE 0.075
Use #33397B 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.