#37559E
Closest named color: Denim Blue (#3B5B92). oklch(46.5% 0.124 265.1), rgb(55, 85, 158).
Aa
White text reads best on this color (7.10:1).
About this color
#37559E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 47%, its chroma 0.124 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.029 away. White text reads best on it, at 7.10:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 2.95:1 |
| White text | 7.10:1 |
Values
| HEX | #37559E |
| RGB | rgb(55, 85, 158) |
| HSL | hsl(223, 48%, 42%) |
| OKLCH | oklch(46.5% 0.124 265.1) |
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 #37559E | 7.10:1 | AAA | Lc -89.3 | Fine for body text |
| Black text on #37559E | 2.95:1 | Fails | Lc 19.6 | Dividers and decoration only |
| #37559E text on white | 7.10:1 | AAA | Lc 84.4 | Fine for body text |
| #37559E text on black | 2.95:1 | Fails | Lc -17.6 | 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 700.
-
Step 50
50
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CED9F0
oklch(88.4% 0.034 265.2)
-
Step 300
300
#AEC1E8
oklch(81% 0.059 264.6)
-
Step 400
400
#84A0DD
oklch(70.8% 0.095 265.1)
-
Step 500
500
#6587D3
oklch(63.1% 0.121 264.9)
-
Step 600
600
#4D6FC1
oklch(55.6% 0.133 265.4)
-
Step 700
700 (this color)
#37559E
oklch(46.5% 0.124 265.1)
-
Step 800
800
#334C87
oklch(42.7% 0.103 265.1)
-
Step 900
900
#2D406C
oklch(37.8% 0.079 265.2)
-
Step 950
950
#1A263F
oklch(27.1% 0.05 263.9)
#37559E 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) | #325DA1 | 0.022 |
| Deuteranopia (no green cones) | #20549C | 0.022 |
| Tritanopia (no blue cones) | #006672 | 0.104 |
| Achromatopsia (no color) | #585858 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37559E
#37559E
oklch(46.5% 0.124 265.1)
- #725400
#725400
oklch(46.5% 0.095 84.6)
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 #37559E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.029
- Dusk Blue #26538D ΔE 0.034
- Twilight #4E518B ΔE 0.041
- Dusky Blue #475F94 ΔE 0.042
- Light Navy Blue #2E5A88 ΔE 0.043
- Cobalt #1E488F ΔE 0.052
- Blueberry #464196 ΔE 0.054
- Dusk #4E5481 ΔE 0.054
Use #37559E 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.