#37537B
Closest named color: Light Navy Blue (#2E5A88). oklch(43.9% 0.075 257.3), rgb(55, 83, 123).
Aa
White text reads best on this color (7.81:1).
About this color
#37537B is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.075 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Light Navy Blue (#2E5A88), ΔE 0.026 away. White text reads best on it, at 7.81:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Light Navy Blue (#2E5A88) |
| Black text | 2.68:1 |
| White text | 7.81:1 |
Values
| HEX | #37537B |
| RGB | rgb(55, 83, 123) |
| HSL | hsl(215, 38%, 35%) |
| OKLCH | oklch(43.9% 0.075 257.3) |
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 #37537B | 7.81:1 | AAA | Lc -91.8 | Preferred for body text |
| Black text on #37537B | 2.68:1 | Fails | Lc 17.0 | Dividers and decoration only |
| #37537B text on white | 7.81:1 | AAA | Lc 87.0 | Fine for body text |
| #37537B text on black | 2.68:1 | Fails | Lc -15.1 | 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
#E5EAF2
oklch(93.6% 0.012 259.8)
-
Step 200
200
#CFDAE9
oklch(88.5% 0.024 256.1)
-
Step 300
300
#AFC2DD
oklch(80.8% 0.044 257.1)
-
Step 400
400
#85A2CC
oklch(70.6% 0.07 257.6)
-
Step 500
500
#678BBF
oklch(63.1% 0.089 257.5)
-
Step 600
600
#4E74AB
oklch(55.5% 0.096 257.6)
-
Step 700
700
#3F6193
oklch(49% 0.09 257.9)
-
Step 800
800 (this color)
#37537B
oklch(43.9% 0.075 257.3)
-
Step 900
900
#2D4260
oklch(37.6% 0.058 257.3)
-
Step 950
950
#1B2738
oklch(27% 0.036 257.1)
#37537B 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) | #43567D | 0.019 |
| Deuteranopia (no green cones) | #3B4F7A | 0.012 |
| Tritanopia (no blue cones) | #125C61 | 0.067 |
| Achromatopsia (no color) | #525252 | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37537B
#37537B
oklch(43.9% 0.075 257.3)
- #694C1C
#694C1C
oklch(43.8% 0.075 77)
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 #37537B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Navy Blue #2E5A88 ΔE 0.026
- YInMn Blue #415A77 ΔE 0.028
- Dusk Blue #26538D ΔE 0.033
- Dusk #4E5481 ΔE 0.034
- Light Navy #155084 ΔE 0.036
- Deep Sea Blue #015482 ΔE 0.037
- Denim Blue #3B5B92 ΔE 0.041
- Twilight #4E518B ΔE 0.043
Use #37537B 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.