#37588E
Closest named color: Denim Blue (#3B5B92). oklch(46.2% 0.097 259.8), rgb(55, 88, 142).
Aa
White text reads best on this color (7.12:1).
About this color
#37588E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.097 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.012 away. White text reads best on it, at 7.12:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 2.94:1 |
| White text | 7.12:1 |
Values
| HEX | #37588E |
| RGB | rgb(55, 88, 142) |
| HSL | hsl(217, 44%, 39%) |
| OKLCH | oklch(46.2% 0.097 259.8) |
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 #37588E | 7.12:1 | AAA | Lc -89.5 | Fine for body text |
| Black text on #37588E | 2.94:1 | Fails | Lc 19.5 | Dividers and decoration only |
| #37588E text on white | 7.12:1 | AAA | Lc 84.5 | Fine for body text |
| #37588E text on black | 2.94:1 | Fails | Lc -17.5 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E5EAF3
oklch(93.6% 0.013 262.4)
-
Step 200
200
#CFDAEB
oklch(88.5% 0.026 259)
-
Step 300
300
#AFC2DF
oklch(80.9% 0.046 258.8)
-
Step 400
400
#85A2D0
oklch(70.7% 0.075 259.5)
-
Step 500
500
#678AC3
oklch(63.1% 0.095 259.9)
-
Step 600
600
#4E73B0
oklch(55.6% 0.104 260)
-
Step 700
700 (this color)
#37588E
oklch(46.2% 0.097 259.8)
-
Step 800
800
#344F7B
oklch(42.7% 0.081 259.8)
-
Step 900
900
#2E4263
oklch(37.8% 0.062 260.1)
-
Step 950
950
#1B273A
oklch(27.1% 0.039 259.4)
#37588E 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) | #415C90 | 0.018 |
| Deuteranopia (no green cones) | #36548D | 0.012 |
| Tritanopia (no blue cones) | #00646C | 0.083 |
| Achromatopsia (no color) | #585858 | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37588E
#37588E
oklch(46.2% 0.097 259.8)
- #745100
#745100
oklch(46.1% 0.096 79.8)
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 #37588E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.012
- Light Navy Blue #2E5A88 ΔE 0.016
- Dusk Blue #26538D ΔE 0.024
- Dusky Blue #475F94 ΔE 0.031
- Twilight #4E518B ΔE 0.033
- Dusk #4E5481 ΔE 0.034
- Denim #3B638C ΔE 0.035
- YInMn Blue #415A77 ΔE 0.041
Use #37588E 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.