#37538D
Closest named color: Dusk Blue (#26538D). oklch(45% 0.101 263.4), rgb(55, 83, 141).
Aa
White text reads best on this color (7.54:1).
About this color
#37538D is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.101 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.017 away. White text reads best on it, at 7.54:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.78:1 |
| White text | 7.54:1 |
Values
| HEX | #37538D |
| RGB | rgb(55, 83, 141) |
| HSL | hsl(220, 44%, 38%) |
| OKLCH | oklch(45% 0.101 263.4) |
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 #37538D | 7.54:1 | AAA | Lc -90.8 | Preferred for body text |
| Black text on #37538D | 2.78:1 | Fails | Lc 18.0 | Dividers and decoration only |
| #37538D text on white | 7.54:1 | AAA | Lc 86.0 | Fine for body text |
| #37538D text on black | 2.78:1 | Fails | Lc -16.0 | Dividers and decoration only |
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 800.
-
Step 50
50
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CEDAF0
oklch(88.6% 0.033 262.7)
-
Step 300
300
#ADC1E8
oklch(80.9% 0.06 263.7)
-
Step 400
400
#82A0DC
oklch(70.7% 0.095 263.7)
-
Step 500
500
#6388D3
oklch(63.2% 0.121 263.4)
-
Step 600
600
#4A70C0
oklch(55.6% 0.132 263.5)
-
Step 700
700
#3B5DA5
oklch(49% 0.122 263.5)
-
Step 800
800 (this color)
#37538D
oklch(45% 0.101 263.4)
-
Step 900
900
#2B406B
oklch(37.6% 0.079 263.4)
-
Step 950
950
#19263F
oklch(27% 0.05 262.6)
#37538D 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) | #3A598F | 0.018 |
| Deuteranopia (no green cones) | #2E518C | 0.012 |
| Tritanopia (no blue cones) | #006069 | 0.088 |
| Achromatopsia (no color) | #545454 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37538D
#37538D
oklch(45% 0.101 263.4)
- #6E5000
#6E5000
oklch(45.1% 0.093 83.5)
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 #37538D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.017
- Denim Blue #3B5B92 ΔE 0.025
- Light Navy Blue #2E5A88 ΔE 0.025
- Twilight #4E518B ΔE 0.030
- Dusk #4E5481 ΔE 0.036
- Light Navy #155084 ΔE 0.037
- Dusky Blue #475F94 ΔE 0.043
- Deep Sea Blue #015482 ΔE 0.043
Use #37538D 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.