#37659E
Closest named color: Dusky Blue (#475F94). oklch(50.2% 0.105 254.8), rgb(55, 101, 158).
Aa
White text reads best on this color (5.96:1).
About this color
#37659E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.105 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.025 away. White text reads best on it, at 5.96:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.51:1 |
| White text | 5.96:1 |
Values
| HEX | #37659E |
| RGB | rgb(55, 101, 158) |
| HSL | hsl(213, 48%, 42%) |
| OKLCH | oklch(50.2% 0.105 254.8) |
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 #37659E | 5.96:1 | AA | Lc -84.8 | Fine for body text |
| Black text on #37659E | 3.51:1 | AA large text | Lc 24.4 | Dividers and decoration only |
| #37659E text on white | 5.96:1 | AA | Lc 79.6 | Fine for body text |
| #37659E text on black | 3.51:1 | AA large text | Lc -22.2 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF4
oklch(93.7% 0.015 251.2)
-
Step 200
200
#CDDAEC
oklch(88.4% 0.029 256.5)
-
Step 300
300
#ABC3E1
oklch(80.9% 0.05 254.1)
-
Step 400
400
#7EA3D3
oklch(70.6% 0.082 255.2)
-
Step 500
500
#5D8CC7
oklch(63.2% 0.103 254.7)
-
Step 600
600
#4275B4
oklch(55.6% 0.113 254.7)
-
Step 700
700 (this color)
#37659E
oklch(50.2% 0.105 254.8)
-
Step 800
800
#2C507D
oklch(42.7% 0.086 254.9)
-
Step 900
900
#284365
oklch(37.8% 0.067 254.9)
-
Step 950
950
#18273B
oklch(27% 0.043 255.9)
#37659E 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) | #4C69A0 | 0.027 |
| Deuteranopia (no green cones) | #3E5F9D | 0.017 |
| Tritanopia (no blue cones) | #00727A | 0.084 |
| Achromatopsia (no color) | #636363 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37659E
#37659E
oklch(50.2% 0.105 254.8)
- #865903
#865903
oklch(50.1% 0.105 74.6)
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 #37659E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.025
- Denim #3B638C ΔE 0.028
- Denim Blue #3B5B92 ΔE 0.031
- French Blue #436BAD ΔE 0.031
- Mid Blue #276AB3 ΔE 0.034
- Peacock Blue #016795 ΔE 0.034
- Muted Blue #3B719F ΔE 0.036
- Ocean Blue #03719C ΔE 0.041
Use #37659E 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.