#37407F
Closest named color: Dark Slate Blue (#483D8B). oklch(39.8% 0.106 274.5), rgb(55, 64, 127).
Aa
White text reads best on this color (9.53:1).
About this color
#37407F is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.106 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.034 away. White text reads best on it, at 9.53:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.20:1 |
| White text | 9.53:1 |
Values
| HEX | #37407F |
| RGB | rgb(55, 64, 127) |
| HSL | hsl(233, 40%, 36%) |
| OKLCH | oklch(39.8% 0.106 274.5) |
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 #37407F | 9.53:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #37407F | 2.20:1 | Fails | Lc 12.1 | Not readable |
| #37407F text on white | 9.53:1 | AAA | Lc 91.9 | Preferred for body text |
| #37407F text on black | 2.20:1 | Fails | Lc -10.5 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FA
oklch(93.6% 0.023 275.4)
-
Step 200
200
#D0D8F7
oklch(88.6% 0.044 274)
-
Step 300
300
#B1BDF4
oklch(80.8% 0.079 274.9)
-
Step 400
400
#8999EF
oklch(70.6% 0.127 274.7)
-
Step 500
500
#6E7EEA
oklch(63.2% 0.162 274.5)
-
Step 600
600
#5764D8
oklch(55.6% 0.176 274.3)
-
Step 700
700
#4852BB
oklch(49% 0.164 274.6)
-
Step 800
800
#3B4498
oklch(42.8% 0.136 274.5)
-
Step 900
900 (this color)
#37407F
oklch(39.8% 0.106 274.5)
-
Step 950
950
#1D2347
oklch(27.1% 0.067 274)
#37407F 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) | #224981 | 0.032 |
| Deuteranopia (no green cones) | #19427E | 0.033 |
| Tritanopia (no blue cones) | #124E59 | 0.094 |
| Achromatopsia (no color) | #454545 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37407F
#37407F
oklch(39.8% 0.106 274.5)
- #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 #37407F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.034
- Cobalt #1E488F ΔE 0.039
- Twilight Blue #0A437A ΔE 0.044
- Blueberry #464196 ΔE 0.045
- Light Navy #155084 ΔE 0.051
- Dusk Blue #26538D ΔE 0.055
- Twilight #4E518B ΔE 0.064
- Deep Sea Blue #015482 ΔE 0.065
Use #37407F 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.