#37538F
Closest named color: Dusk Blue (#26538D). oklch(45.1% 0.104 263.9), rgb(55, 83, 143).
Aa
White text reads best on this color (7.50:1).
About this color
#37538F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.104 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.018 away. White text reads best on it, at 7.50:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.79:1 |
| White text | 7.50:1 |
Values
| HEX | #37538F |
| RGB | rgb(55, 83, 143) |
| HSL | hsl(221, 44%, 39%) |
| OKLCH | oklch(45.1% 0.104 263.9) |
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 #37538F | 7.50:1 | AAA | Lc -90.7 | Preferred for body text |
| Black text on #37538F | 2.79:1 | Fails | Lc 18.1 | Dividers and decoration only |
| #37538F text on white | 7.50:1 | AAA | Lc 85.9 | Fine for body text |
| #37538F text on black | 2.79:1 | Fails | Lc -16.1 | 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
#ADC1E9
oklch(80.9% 0.061 264.2)
-
Step 400
400
#81A0DE
oklch(70.7% 0.098 263.6)
-
Step 500
500
#6287D5
oklch(63.1% 0.125 263.9)
-
Step 600
600
#4970C2
oklch(55.7% 0.135 263.5)
-
Step 700
700
#3B5DA7
oklch(49.1% 0.125 263.8)
-
Step 800
800 (this color)
#37538F
oklch(45.1% 0.104 263.9)
-
Step 900
900
#2B406D
oklch(37.7% 0.082 264)
-
Step 950
950
#192640
oklch(27.1% 0.052 263.2)
#37538F 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) | #395991 | 0.018 |
| Deuteranopia (no green cones) | #2D518E | 0.013 |
| Tritanopia (no blue cones) | #00606A | 0.089 |
| Achromatopsia (no color) | #555555 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37538F
#37538F
oklch(45.1% 0.104 263.9)
- #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 #37538F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.018
- Denim Blue #3B5B92 ΔE 0.024
- Light Navy Blue #2E5A88 ΔE 0.027
- Twilight #4E518B ΔE 0.031
- Dusk #4E5481 ΔE 0.038
- Light Navy #155084 ΔE 0.038
- Dusky Blue #475F94 ΔE 0.042
- Cobalt #1E488F ΔE 0.044
Use #37538F 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.