#373965
Closest named color: Prussian Blue (#1D3557). oklch(36.5% 0.075 280), rgb(55, 57, 101).
Aa
White text reads best on this color (10.84:1).
About this color
#373965 is a dark, moderately saturated purple. In OKLCH its lightness is 36%, its chroma 0.075 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.047 away. White text reads best on it, at 10.84:1.
| Hue family | Purples |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.93:1 |
| White text | 10.84:1 |
Values
| HEX | #373965 |
| RGB | rgb(55, 57, 101) |
| HSL | hsl(237, 29%, 31%) |
| OKLCH | oklch(36.5% 0.075 280) |
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 #373965 | 10.84:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #373965 | 1.93:1 | Fails | Lc 8.9 | Not readable |
| #373965 text on white | 10.84:1 | AAA | Lc 95.0 | Preferred for body text |
| #373965 text on black | 1.93:1 | Fails | Lc -7.6 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F5
oklch(93.6% 0.016 278.5)
-
Step 200
200
#D4D7EE
oklch(88.4% 0.032 279.8)
-
Step 300
300
#B9BDE5
oklch(80.9% 0.056 280.6)
-
Step 400
400
#959BD8
oklch(70.8% 0.089 279.5)
-
Step 500
500
#7C81CE
oklch(63.2% 0.115 279.7)
-
Step 600
600
#6669BB
oklch(55.7% 0.126 279.9)
-
Step 700
700
#5557A1
oklch(49.1% 0.117 280)
-
Step 800
800
#454782
oklch(42.6% 0.097 280)
-
Step 900
900 (this color)
#373965
oklch(36.5% 0.075 280)
-
Step 950
950
#22243D
oklch(27.1% 0.046 279.3)
#373965 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) | #293F67 | 0.025 |
| Deuteranopia (no green cones) | #263B64 | 0.024 |
| Tritanopia (no blue cones) | #28424A | 0.066 |
| Achromatopsia (no color) | #3D3D3D | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373965
#373965
oklch(36.5% 0.075 280)
- #483F01
#483F01
oklch(36.6% 0.075 100.1)
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 #373965, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.047
- Dark Grey Blue #29465B ΔE 0.050
- Marine Blue #01386A ΔE 0.056
- Twilight Blue #0A437A ΔE 0.056
- Dark Blue Grey #1F3B4D ΔE 0.057
- Charcoal #264653 ΔE 0.062
- Onyx #343A40 ΔE 0.067
- Gunmetal #293241 ΔE 0.069
Use #373965 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.