#373E85
Closest named color: Dark Slate Blue (#483D8B). oklch(39.8% 0.118 275.5), rgb(55, 62, 133).
Aa
White text reads best on this color (9.58:1).
About this color
#373E85 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.118 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.029 away. White text reads best on it, at 9.58:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.19:1 |
| White text | 9.58:1 |
Values
| HEX | #373E85 |
| RGB | rgb(55, 62, 133) |
| HSL | hsl(235, 41%, 37%) |
| OKLCH | oklch(39.8% 0.118 275.5) |
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 #373E85 | 9.58:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #373E85 | 2.19:1 | Fails | Lc 12.0 | Not readable |
| #373E85 text on white | 9.58:1 | AAA | Lc 92.0 | Preferred for body text |
| #373E85 text on black | 2.19:1 | Fails | Lc -10.4 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E5E9FB
oklch(93.6% 0.025 275.9)
-
Step 200
200
#CFD7FA
oklch(88.4% 0.049 275.2)
-
Step 300
300
#B0BCFA
oklch(80.8% 0.089 275.8)
-
Step 400
400
#8897F8
oklch(70.6% 0.142 275.5)
-
Step 500
500
#6D7AF4
oklch(63% 0.181 275.4)
-
Step 600
600
#5860E3
oklch(55.7% 0.196 275.4)
-
Step 700
700
#494EC5
oklch(49.2% 0.182 275.6)
-
Step 800
800
#3B419F
oklch(42.7% 0.15 275.3)
-
Step 900
900 (this color)
#373E85
oklch(39.8% 0.118 275.5)
-
Step 950
950
#1D214A
oklch(26.9% 0.075 275.9)
#373E85 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) | #174888 | 0.039 |
| Deuteranopia (no green cones) | #074284 | 0.044 |
| Tritanopia (no blue cones) | #084E5B | 0.103 |
| Achromatopsia (no color) | #454545 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373E85
#373E85
oklch(39.8% 0.118 275.5)
- #554600
#554600
oklch(39.8% 0.082 95)
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 #373E85, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.029
- Cobalt #1E488F ΔE 0.037
- Blueberry #464196 ΔE 0.038
- Twilight Blue #0A437A ΔE 0.048
- Light Navy #155084 ΔE 0.057
- Dusk Blue #26538D ΔE 0.059
- Twilight #4E518B ΔE 0.067
- Sapphire #2138AB ΔE 0.070
Use #373E85 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.