#37566C
Closest named color: YInMn Blue (#415A77). oklch(43.8% 0.052 240.4), rgb(55, 86, 108).
Aa
White text reads best on this color (7.74:1).
About this color
#37566C is a dark, muted blue. In OKLCH its lightness is 44%, its chroma 0.052 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.025 away. White text reads best on it, at 7.74:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | muted (0.052) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.71:1 |
| White text | 7.74:1 |
Values
| HEX | #37566C |
| RGB | rgb(55, 86, 108) |
| HSL | hsl(205, 33%, 32%) |
| OKLCH | oklch(43.8% 0.052 240.4) |
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 #37566C | 7.74:1 | AAA | Lc -91.6 | Preferred for body text |
| Black text on #37566C | 2.71:1 | Fails | Lc 17.2 | Dividers and decoration only |
| #37566C text on white | 7.74:1 | AAA | Lc 86.8 | Fine for body text |
| #37566C text on black | 2.71:1 | Fails | Lc -15.3 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EBEF
oklch(93.7% 0.008 236.6)
-
Step 200
200
#D0DBE3
oklch(88.5% 0.016 239.1)
-
Step 300
300
#B0C4D3
oklch(81% 0.03 240.3)
-
Step 400
400
#86A5BC
oklch(70.7% 0.048 240.5)
-
Step 500
500
#678FAC
oklch(63.2% 0.062 240.5)
-
Step 600
600
#4E7997
oklch(55.7% 0.067 240)
-
Step 700
700
#3E6581
oklch(49% 0.063 241)
-
Step 800
800 (this color)
#37566C
oklch(43.8% 0.052 240.4)
-
Step 900
900
#2E4555
oklch(37.8% 0.04 239.5)
-
Step 950
950
#1B2832
oklch(27% 0.026 242)
#37566C 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) | #4C566D | 0.028 |
| Deuteranopia (no green cones) | #45506C | 0.024 |
| Tritanopia (no blue cones) | #1F5B5D | 0.041 |
| Achromatopsia (no color) | #535353 | 0.052 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37566C
#37566C
oklch(43.8% 0.052 240.4)
- #674B34
#674B34
oklch(43.7% 0.052 60.3)
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 #37566C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.025
- Petrol #005F6A ΔE 0.043
- Dusty Grape #545775 ΔE 0.044
- Light Navy Blue #2E5A88 ΔE 0.045
- Dusk #4E5481 ΔE 0.050
- Dark Slate Gray #2F4F4F ΔE 0.051
- Deep Sea Blue #015482 ΔE 0.052
- Deep Teal #00555A ΔE 0.053
Use #37566C 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.