#37517B
Closest named color: Light Navy Blue (#2E5A88). oklch(43.4% 0.077 259.6), rgb(55, 81, 123).
Aa
White text reads best on this color (7.99:1).
About this color
#37517B is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.077 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Light Navy Blue (#2E5A88), ΔE 0.030 away. White text reads best on it, at 7.99:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Light Navy Blue (#2E5A88) |
| Black text | 2.62:1 |
| White text | 7.99:1 |
Values
| HEX | #37517B |
| RGB | rgb(55, 81, 123) |
| HSL | hsl(217, 38%, 35%) |
| OKLCH | oklch(43.4% 0.077 259.6) |
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 #37517B | 7.99:1 | AAA | Lc -92.3 | Preferred for body text |
| Black text on #37517B | 2.62:1 | Fails | Lc 16.4 | Dividers and decoration only |
| #37517B text on white | 7.99:1 | AAA | Lc 87.6 | Fine for body text |
| #37517B text on black | 2.62:1 | Fails | Lc -14.5 | Not readable |
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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E5EAF3
oklch(93.6% 0.013 262.4)
-
Step 200
200
#D0DAEA
oklch(88.6% 0.025 259.8)
-
Step 300
300
#B0C2DE
oklch(80.9% 0.044 259.2)
-
Step 400
400
#86A2CE
oklch(70.7% 0.072 259.3)
-
Step 500
500
#688AC1
oklch(63% 0.092 259.8)
-
Step 600
600
#4F73AD
oklch(55.5% 0.1 259.6)
-
Step 700
700
#406195
oklch(49.2% 0.092 259.2)
-
Step 800
800 (this color)
#37517B
oklch(43.4% 0.077 259.6)
-
Step 900
900
#2E4261
oklch(37.7% 0.059 258.9)
-
Step 950
950
#1B2739
oklch(27.1% 0.038 258.3)
#37517B 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) | #40547D | 0.016 |
| Deuteranopia (no green cones) | #384E7A | 0.009 |
| Tritanopia (no blue cones) | #125A60 | 0.068 |
| Achromatopsia (no color) | #515151 | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37517B
#37517B
oklch(43.4% 0.077 259.6)
- #674B18
#674B18
oklch(43.3% 0.076 78.9)
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 #37517B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Navy Blue #2E5A88 ΔE 0.030
- Dusk Blue #26538D ΔE 0.032
- Light Navy #155084 ΔE 0.034
- YInMn Blue #415A77 ΔE 0.034
- Dusk #4E5481 ΔE 0.035
- Deep Sea Blue #015482 ΔE 0.037
- Twilight #4E518B ΔE 0.043
- Denim Blue #3B5B92 ΔE 0.044
Use #37517B 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.