#37577B
Closest named color: YInMn Blue (#415A77). oklch(44.9% 0.07 252.3), rgb(55, 87, 123).
Aa
White text reads best on this color (7.46:1).
About this color
#37577B is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.070 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.018 away. White text reads best on it, at 7.46:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.070) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.81:1 |
| White text | 7.46:1 |
Values
| HEX | #37577B |
| RGB | rgb(55, 87, 123) |
| HSL | hsl(212, 38%, 35%) |
| OKLCH | oklch(44.9% 0.07 252.3) |
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 #37577B | 7.46:1 | AAA | Lc -90.7 | Preferred for body text |
| Black text on #37577B | 2.81:1 | Fails | Lc 18.2 | Dividers and decoration only |
| #37577B text on white | 7.46:1 | AAA | Lc 85.8 | Fine for body text |
| #37577B text on black | 2.81:1 | Fails | Lc -16.2 | 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 800.
-
Step 50
50
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EBF2
oklch(93.7% 0.012 248)
-
Step 200
200
#CFDAE8
oklch(88.4% 0.023 254.4)
-
Step 300
300
#AEC3DB
oklch(80.9% 0.041 251.8)
-
Step 400
400
#83A4C9
oklch(70.8% 0.066 251.6)
-
Step 500
500
#648DBB
oklch(63.2% 0.083 252)
-
Step 600
600
#4A76A8
oklch(55.6% 0.092 252.6)
-
Step 700
700
#3B6390
oklch(49.1% 0.086 252.5)
-
Step 800
800 (this color)
#37577B
oklch(44.9% 0.07 252.3)
-
Step 900
900
#2C435E
oklch(37.7% 0.055 253.1)
-
Step 950
950
#1A2737
oklch(26.9% 0.035 254.1)
#37577B 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) | #48597D | 0.023 |
| Deuteranopia (no green cones) | #40527A | 0.017 |
| Tritanopia (no blue cones) | #105F64 | 0.061 |
| Achromatopsia (no color) | #555555 | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37577B
#37577B
oklch(44.9% 0.07 252.3)
- #6D4E25
#6D4E25
oklch(44.8% 0.07 71.9)
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 #37577B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.018
- Light Navy Blue #2E5A88 ΔE 0.022
- Dusk #4E5481 ΔE 0.034
- Denim Blue #3B5B92 ΔE 0.038
- Dusk Blue #26538D ΔE 0.038
- Dusty Grape #545775 ΔE 0.040
- Deep Sea Blue #015482 ΔE 0.040
- Denim #3B638C ΔE 0.042
Use #37577B 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.