#37577F
Closest named color: Light Navy Blue (#2E5A88). oklch(45.1% 0.076 254.6), rgb(55, 87, 127).
Aa
White text reads best on this color (7.41:1).
About this color
#37577F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.076 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Light Navy Blue (#2E5A88), ΔE 0.017 away. White text reads best on it, at 7.41:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Light Navy Blue (#2E5A88) |
| Black text | 2.83:1 |
| White text | 7.41:1 |
Values
| HEX | #37577F |
| RGB | rgb(55, 87, 127) |
| HSL | hsl(213, 40%, 36%) |
| OKLCH | oklch(45.1% 0.076 254.6) |
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 #37577F | 7.41:1 | AAA | Lc -90.5 | Preferred for body text |
| Black text on #37577F | 2.83:1 | Fails | Lc 18.4 | Dividers and decoration only |
| #37577F text on white | 7.41:1 | AAA | Lc 85.6 | Fine for body text |
| #37577F text on black | 2.83:1 | Fails | Lc -16.4 | 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
#E4EAF3
oklch(93.5% 0.014 258.3)
-
Step 200
200
#CEDAEA
oklch(88.4% 0.026 255.6)
-
Step 300
300
#AEC3DE
oklch(81% 0.045 254.8)
-
Step 400
400
#82A3CD
oklch(70.6% 0.072 254.7)
-
Step 500
500
#638CC0
oklch(63.1% 0.091 254.8)
-
Step 600
600
#4975AC
oklch(55.5% 0.099 254.7)
-
Step 700
700
#3A6294
oklch(49% 0.093 254.8)
-
Step 800
800 (this color)
#37577F
oklch(45.1% 0.076 254.6)
-
Step 900
900
#2B4361
oklch(37.8% 0.06 254.6)
-
Step 950
950
#1A2739
oklch(27% 0.038 256.7)
#37577F 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) | #475981 | 0.022 |
| Deuteranopia (no green cones) | #3E527E | 0.016 |
| Tritanopia (no blue cones) | #096065 | 0.067 |
| Achromatopsia (no color) | #555555 | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37577F
#37577F
oklch(45.1% 0.076 254.6)
- #6E4F1F
#6E4F1F
oklch(45.1% 0.076 75.4)
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 #37577F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Navy Blue #2E5A88 ΔE 0.017
- YInMn Blue #415A77 ΔE 0.022
- Dusk #4E5481 ΔE 0.031
- Denim Blue #3B5B92 ΔE 0.032
- Dusk Blue #26538D ΔE 0.033
- Denim #3B638C ΔE 0.039
- Deep Sea Blue #015482 ΔE 0.039
- Light Navy #155084 ΔE 0.041
Use #37577F 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.