#37417D
Closest named color: Dark Slate Blue (#483D8B). oklch(39.9% 0.101 273.8), rgb(55, 65, 125).
Aa
White text reads best on this color (9.48:1).
About this color
#37417D is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.101 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.037 away. White text reads best on it, at 9.48:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.21:1 |
| White text | 9.48:1 |
Values
| HEX | #37417D |
| RGB | rgb(55, 65, 125) |
| HSL | hsl(231, 39%, 35%) |
| OKLCH | oklch(39.9% 0.101 273.8) |
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 #37417D | 9.48:1 | AAA | Lc -96.0 | Preferred for body text |
| Black text on #37417D | 2.21:1 | Fails | Lc 12.2 | Not readable |
| #37417D text on white | 9.48:1 | AAA | Lc 91.8 | Preferred for body text |
| #37417D text on black | 2.21:1 | Fails | Lc -10.6 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9F9
oklch(93.6% 0.022 274.7)
-
Step 200
200
#D0D8F6
oklch(88.6% 0.042 273.7)
-
Step 300
300
#B1BEF2
oklch(81% 0.075 273.7)
-
Step 400
400
#899AEC
oklch(70.7% 0.122 274)
-
Step 500
500
#6D7FE6
oklch(63.1% 0.155 273.7)
-
Step 600
600
#5766D4
oklch(55.6% 0.168 273.8)
-
Step 700
700
#4754B8
oklch(49.1% 0.157 273.6)
-
Step 800
800
#3A4595
oklch(42.7% 0.131 273.6)
-
Step 900
900 (this color)
#37417D
oklch(39.9% 0.101 273.8)
-
Step 950
950
#1D2345
oklch(27% 0.063 273.9)
#37417D 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) | #26497F | 0.028 |
| Deuteranopia (no green cones) | #1E437C | 0.029 |
| Tritanopia (no blue cones) | #154E59 | 0.089 |
| Achromatopsia (no color) | #464646 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37417D
#37417D
oklch(39.9% 0.101 273.8)
- #564600
#564600
oklch(39.9% 0.082 94)
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 #37417D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.037
- Cobalt #1E488F ΔE 0.040
- Twilight Blue #0A437A ΔE 0.043
- Blueberry #464196 ΔE 0.048
- Light Navy #155084 ΔE 0.049
- Dusk Blue #26538D ΔE 0.054
- Deep Sea Blue #015482 ΔE 0.062
- Twilight #4E518B ΔE 0.062
Use #37417D 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.