#373699
Closest named color: Blueberry (#464196). oklch(39.9% 0.157 277), rgb(55, 54, 153).
Aa
White text reads best on this color (9.76:1).
About this color
#373699 is a dark, vivid blue. In OKLCH its lightness is 40%, its chroma 0.157 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.039 away. White text reads best on it, at 9.76:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | vivid (0.157) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.15:1 |
| White text | 9.76:1 |
Values
| HEX | #373699 |
| RGB | rgb(55, 54, 153) |
| HSL | hsl(241, 48%, 41%) |
| OKLCH | oklch(39.9% 0.157 277) |
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 #373699 | 9.76:1 | AAA | Lc -96.4 | Preferred for body text |
| Black text on #373699 | 2.15:1 | Fails | Lc 11.8 | Not readable |
| #373699 text on white | 9.76:1 | AAA | Lc 92.1 | Preferred for body text |
| #373699 text on black | 2.15:1 | Fails | Lc -10.3 | 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
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E4E9FF
oklch(93.7% 0.03 275.6)
-
Step 200
200
#CFD6FF
oklch(88.4% 0.057 277.5)
-
Step 300
300
#B0BBFF
oklch(80.8% 0.097 276.9)
-
Step 400
400
#8995FF
oklch(70.7% 0.154 276.8)
-
Step 500
500
#6F76FF
oklch(63.2% 0.2 276.8)
-
Step 600
600
#5A50FF
oklch(55.6% 0.248 277.1)
-
Step 700
700
#4B3AE5
oklch(49.2% 0.243 277.1)
-
Step 800
800
#3C32B9
oklch(42.7% 0.202 276.9)
-
Step 900
900 (this color)
#373699
oklch(39.9% 0.157 277)
-
Step 950
950
#1D1D55
oklch(27% 0.099 277.5)
#373699 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) | #00489C | 0.056 |
| Deuteranopia (no green cones) | #004097 | 0.049 |
| Tritanopia (no blue cones) | #004F62 | 0.131 |
| Achromatopsia (no color) | #444444 | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373699
#373699
oklch(39.9% 0.157 277)
- #544700
#544700
oklch(39.9% 0.082 97.2)
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 #373699, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.039
- Sapphire #2138AB ΔE 0.040
- Dark Slate Blue #483D8B ΔE 0.042
- Cobalt #1E488F ΔE 0.053
- Indigo Blue #3A18B1 ΔE 0.059
- Imperial Purple #480CA8 ΔE 0.066
- Twilight Blue #0A437A ΔE 0.075
- Majorelle Blue #3F37C9 ΔE 0.079
Use #373699 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.