#373979
Closest named color: Dark Slate Blue (#483D8B). oklch(37.9% 0.107 278.7), rgb(55, 57, 121).
Aa
White text reads best on this color (10.37:1).
About this color
#373979 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.107 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.043 away. White text reads best on it, at 10.37:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.02:1 |
| White text | 10.37:1 |
Values
| HEX | #373979 |
| RGB | rgb(55, 57, 121) |
| HSL | hsl(238, 37%, 35%) |
| OKLCH | oklch(37.9% 0.107 278.7) |
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 #373979 | 10.37:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #373979 | 2.02:1 | Fails | Lc 10.0 | Not readable |
| #373979 text on white | 10.37:1 | AAA | Lc 93.9 | Preferred for body text |
| #373979 text on black | 2.02:1 | Fails | Lc -8.7 | 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
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E6E9FA
oklch(93.7% 0.023 277.9)
-
Step 200
200
#D2D7F7
oklch(88.5% 0.044 278.4)
-
Step 300
300
#B5BCF4
oklch(80.9% 0.079 278.9)
-
Step 400
400
#8F97EF
oklch(70.6% 0.128 278.6)
-
Step 500
500
#767BEA
oklch(63.2% 0.164 278.7)
-
Step 600
600
#6061D8
oklch(55.6% 0.178 278.5)
-
Step 700
700
#504FBB
oklch(49% 0.166 278.8)
-
Step 800
800
#414297
oklch(42.7% 0.136 278.4)
-
Step 900
900 (this color)
#373979
oklch(37.9% 0.107 278.7)
-
Step 950
950
#202247
oklch(27.1% 0.068 278.5)
#373979 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) | #19437B | 0.041 |
| Deuteranopia (no green cones) | #113D78 | 0.042 |
| Tritanopia (no blue cones) | #1B4753 | 0.093 |
| Achromatopsia (no color) | #404040 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373979
#373979
oklch(37.9% 0.107 278.7)
- #4D4200
#4D4200
oklch(37.9% 0.078 98.5)
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 #373979, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.043
- Twilight Blue #0A437A ΔE 0.048
- Cobalt #1E488F ΔE 0.055
- Blueberry #464196 ΔE 0.058
- Marine Blue #01386A ΔE 0.062
- Light Navy #155084 ΔE 0.069
- Prussian Blue #1D3557 ΔE 0.071
- Dark Grey Blue #29465B ΔE 0.073
Use #373979 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.