#37577D
Closest named color: Light Navy Blue (#2E5A88). oklch(45% 0.073 253.5), rgb(55, 87, 125).
Aa
White text reads best on this color (7.44:1).
About this color
#37577D is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.073 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Light Navy Blue (#2E5A88), ΔE 0.019 away. White text reads best on it, at 7.44:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Light Navy Blue (#2E5A88) |
| Black text | 2.82:1 |
| White text | 7.44:1 |
Values
| HEX | #37577D |
| RGB | rgb(55, 87, 125) |
| HSL | hsl(213, 39%, 35%) |
| OKLCH | oklch(45% 0.073 253.5) |
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 #37577D | 7.44:1 | AAA | Lc -90.6 | Preferred for body text |
| Black text on #37577D | 2.82:1 | Fails | Lc 18.3 | Dividers and decoration only |
| #37577D text on white | 7.44:1 | AAA | Lc 85.7 | Fine for body text |
| #37577D text on black | 2.82:1 | Fails | Lc -16.3 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EAF2
oklch(93.5% 0.013 255.5)
-
Step 200
200
#CFDAE9
oklch(88.5% 0.024 256.1)
-
Step 300
300
#AEC3DC
oklch(80.9% 0.042 252.9)
-
Step 400
400
#83A3CB
oklch(70.6% 0.069 254.3)
-
Step 500
500
#638CBE
oklch(63% 0.089 253.9)
-
Step 600
600
#4A76AA
oklch(55.7% 0.095 253.5)
-
Step 700
700
#3B6392
oklch(49.2% 0.088 253.5)
-
Step 800
800 (this color)
#37577D
oklch(45% 0.073 253.5)
-
Step 900
900
#2B435F
oklch(37.6% 0.057 253)
-
Step 950
950
#1A2738
oklch(26.9% 0.037 255.4)
#37577D 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) | #48597F | 0.023 |
| Deuteranopia (no green cones) | #3F527C | 0.016 |
| Tritanopia (no blue cones) | #0D6064 | 0.065 |
| Achromatopsia (no color) | #555555 | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37577D
#37577D
oklch(45% 0.073 253.5)
- #6E4E22
#6E4E22
oklch(44.9% 0.074 72.6)
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 #37577D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Navy Blue #2E5A88 ΔE 0.019
- YInMn Blue #415A77 ΔE 0.020
- Dusk #4E5481 ΔE 0.032
- Denim Blue #3B5B92 ΔE 0.035
- Dusk Blue #26538D ΔE 0.036
- Deep Sea Blue #015482 ΔE 0.040
- Denim #3B638C ΔE 0.040
- Dusty Grape #545775 ΔE 0.040
Use #37577D 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.