#373889
Closest named color: Dark Slate Blue (#483D8B). oklch(38.9% 0.132 277.8), rgb(55, 56, 137).
Aa
White text reads best on this color (10.05:1).
About this color
#373889 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.132 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.032 away. White text reads best on it, at 10.05:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.08:1 |
| White text | 10.05:1 |
Values
| HEX | #373889 |
| RGB | rgb(55, 56, 137) |
| HSL | hsl(239, 43%, 38%) |
| OKLCH | oklch(38.9% 0.132 277.8) |
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 #373889 | 10.05:1 | AAA | Lc -97.1 | Preferred for body text |
| Black text on #373889 | 2.08:1 | Fails | Lc 10.9 | Not readable |
| #373889 text on white | 10.05:1 | AAA | Lc 93.0 | Preferred for body text |
| #373889 text on black | 2.08:1 | Fails | Lc -9.5 | 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
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E5E9FD
oklch(93.7% 0.027 276.8)
-
Step 200
200
#D0D6FE
oklch(88.4% 0.055 278.5)
-
Step 300
300
#B1BBFF
oklch(80.9% 0.097 277.5)
-
Step 400
400
#8B94FF
oklch(70.6% 0.155 278)
-
Step 500
500
#7175FF
oklch(63.1% 0.201 277.7)
-
Step 600
600
#5C58EF
oklch(55.6% 0.22 277.7)
-
Step 700
700
#4D46D0
oklch(49% 0.205 277.9)
-
Step 800
800
#3F3BA8
oklch(42.7% 0.169 278.1)
-
Step 900
900 (this color)
#373889
oklch(38.9% 0.132 277.8)
-
Step 950
950
#1E204E
oklch(27.1% 0.083 277.4)
#373889 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) | #00458C | 0.052 |
| Deuteranopia (no green cones) | #003F87 | 0.049 |
| Tritanopia (no blue cones) | #014B5B | 0.114 |
| Achromatopsia (no color) | #424242 | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373889
#373889
oklch(38.9% 0.132 277.8)
- #504400
#504400
oklch(38.7% 0.08 97.7)
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 #373889, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.032
- Blueberry #464196 ΔE 0.040
- Cobalt #1E488F ΔE 0.047
- Twilight Blue #0A437A ΔE 0.057
- Sapphire #2138AB ΔE 0.062
- Light Navy #155084 ΔE 0.071
- Dusk Blue #26538D ΔE 0.073
- Marine Blue #01386A ΔE 0.077
Use #373889 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.