#37597B
Closest named color: YInMn Blue (#415A77). oklch(45.3% 0.069 249.6), rgb(55, 89, 123).
Aa
White text reads best on this color (7.29:1).
About this color
#37597B is a medium-dark, muted blue. In OKLCH its lightness is 45%, its chroma 0.069 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.014 away. White text reads best on it, at 7.29:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.87:1 |
| White text | 7.29:1 |
Values
| HEX | #37597B |
| RGB | rgb(55, 89, 123) |
| HSL | hsl(210, 38%, 35%) |
| OKLCH | oklch(45.3% 0.069 249.6) |
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 #37597B | 7.29:1 | AAA | Lc -90.1 | Preferred for body text |
| Black text on #37597B | 2.87:1 | Fails | Lc 18.8 | Dividers and decoration only |
| #37597B text on white | 7.29:1 | AAA | Lc 85.2 | Fine for body text |
| #37597B text on black | 2.87:1 | Fails | Lc -16.8 | 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
#E4EBF1
oklch(93.6% 0.011 243.7)
-
Step 200
200
#CEDBE8
oklch(88.6% 0.023 248.1)
-
Step 300
300
#AEC3DA
oklch(80.9% 0.04 250.7)
-
Step 400
400
#82A4C8
oklch(70.6% 0.065 250.2)
-
Step 500
500
#628DB9
oklch(63% 0.082 249.8)
-
Step 600
600
#4877A6
oklch(55.6% 0.09 249.7)
-
Step 700
700
#39648E
oklch(49.1% 0.083 249.3)
-
Step 800
800 (this color)
#37597B
oklch(45.3% 0.069 249.6)
-
Step 900
900
#2B445D
oklch(37.8% 0.053 249.4)
-
Step 950
950
#192836
oklch(27% 0.033 247.4)
#37597B 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) | #4B5A7D | 0.026 |
| Deuteranopia (no green cones) | #42537A | 0.021 |
| Tritanopia (no blue cones) | #0F6165 | 0.059 |
| Achromatopsia (no color) | #565656 | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37597B
#37597B
oklch(45.3% 0.069 249.6)
- #6F4F29
#6F4F29
oklch(45.4% 0.069 69.3)
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 #37597B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.014
- Light Navy Blue #2E5A88 ΔE 0.022
- Dusk #4E5481 ΔE 0.035
- Denim #3B638C ΔE 0.037
- Denim Blue #3B5B92 ΔE 0.038
- Dusty Grape #545775 ΔE 0.038
- Dusk Blue #26538D ΔE 0.042
- Deep Sea Blue #015482 ΔE 0.043
Use #37597B 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.