#37306B
Closest named color: Prussian Blue (#1D3557). oklch(35% 0.099 285.5), rgb(55, 48, 107).
Aa
White text reads best on this color (11.68:1).
About this color
#37306B is a dark, moderately saturated purple. In OKLCH its lightness is 35%, its chroma 0.099 and its hue 285°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.055 away. White text reads best on it, at 11.68:1.
| Hue family | Purples |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.79:1 |
| White text | 11.68:1 |
Values
| HEX | #37306B |
| RGB | rgb(55, 48, 107) |
| HSL | hsl(247, 38%, 30%) |
| OKLCH | oklch(35% 0.099 285.5) |
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 #37306B | 11.68:1 | AAA | Lc -100.3 | Preferred for body text |
| Black text on #37306B | 1.79:1 | Fails | Lc 0.0 | Not readable |
| #37306B text on white | 11.68:1 | AAA | Lc 96.7 | Preferred for body text |
| #37306B text on black | 1.79:1 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E8E8F8
oklch(93.6% 0.022 286)
-
Step 200
200
#D6D6F4
oklch(88.5% 0.041 285.5)
-
Step 300
300
#BBBAEF
oklch(80.8% 0.074 285.5)
-
Step 400
400
#9A95E7
oklch(70.7% 0.118 285.7)
-
Step 500
500
#8279E0
oklch(63.1% 0.151 285.2)
-
Step 600
600
#6D5FCE
oklch(55.5% 0.165 285.4)
-
Step 700
700
#5C4EB2
oklch(49.1% 0.153 285.7)
-
Step 800
800
#4B4090
oklch(42.6% 0.127 285.9)
-
Step 900
900 (this color)
#37306B
oklch(35% 0.099 285.5)
-
Step 950
950
#242143
oklch(27% 0.062 285.5)
#37306B 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) | #143A6D | 0.049 |
| Deuteranopia (no green cones) | #12376A | 0.049 |
| Tritanopia (no blue cones) | #263D48 | 0.085 |
| Achromatopsia (no color) | #383838 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37306B
#37306B
oklch(35% 0.099 285.5)
- #403C00
#403C00
oklch(34.9% 0.074 105.4)
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 #37306B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.055
- Marine Blue #01386A ΔE 0.058
- Marine #042E60 ΔE 0.066
- Twilight Blue #0A437A ΔE 0.067
- Dark Slate Blue #483D8B ΔE 0.070
- Space Cadet #2B2D42 ΔE 0.076
- Dark Blue Grey #1F3B4D ΔE 0.076
- Dark Grey Blue #29465B ΔE 0.079
Use #37306B 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.