#37557E
Closest named color: Light Navy Blue (#2E5A88). oklch(44.5% 0.077 256.5), rgb(55, 85, 126).
Aa
White text reads best on this color (7.60:1).
About this color
#37557E is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.077 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Light Navy Blue (#2E5A88), ΔE 0.020 away. White text reads best on it, at 7.60:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Light Navy Blue (#2E5A88) |
| Black text | 2.76:1 |
| White text | 7.60:1 |
Values
| HEX | #37557E |
| RGB | rgb(55, 85, 126) |
| HSL | hsl(215, 39%, 35%) |
| OKLCH | oklch(44.5% 0.077 256.5) |
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 #37557E | 7.60:1 | AAA | Lc -91.1 | Preferred for body text |
| Black text on #37557E | 2.76:1 | Fails | Lc 17.7 | Dividers and decoration only |
| #37557E text on white | 7.60:1 | AAA | Lc 86.3 | Fine for body text |
| #37557E text on black | 2.76:1 | Fails | Lc -15.8 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF3
oklch(93.5% 0.014 258.3)
-
Step 200
200
#CFDAEA
oklch(88.5% 0.025 257.6)
-
Step 300
300
#AEC2DE
oklch(80.8% 0.045 256.8)
-
Step 400
400
#84A3CD
oklch(70.8% 0.071 256.1)
-
Step 500
500
#648BC1
oklch(63% 0.093 256.7)
-
Step 600
600
#4B75AD
oklch(55.7% 0.1 256)
-
Step 700
700
#3C6295
oklch(49.2% 0.093 256.2)
-
Step 800
800 (this color)
#37557E
oklch(44.5% 0.077 256.5)
-
Step 900
900
#2C4261
oklch(37.6% 0.06 257)
-
Step 950
950
#1A2739
oklch(27% 0.038 256.7)
#37557E 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) | #455880 | 0.021 |
| Deuteranopia (no green cones) | #3C517D | 0.012 |
| Tritanopia (no blue cones) | #0C5E64 | 0.067 |
| Achromatopsia (no color) | #545454 | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37557E
#37557E
oklch(44.5% 0.077 256.5)
- #6C4E1C
#6C4E1C
oklch(44.6% 0.077 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 #37557E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Navy Blue #2E5A88 ΔE 0.020
- YInMn Blue #415A77 ΔE 0.025
- Dusk #4E5481 ΔE 0.031
- Dusk Blue #26538D ΔE 0.031
- Denim Blue #3B5B92 ΔE 0.035
- Light Navy #155084 ΔE 0.037
- Deep Sea Blue #015482 ΔE 0.038
- Twilight #4E518B ΔE 0.041
Use #37557E 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.