#37738F
Closest named color: Metallic Blue (#4F738E). oklch(52.8% 0.076 230.8), rgb(55, 115, 143).
Aa
White text reads best on this color (5.23:1).
About this color
#37738F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.076 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.024 away. White text reads best on it, at 5.23:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 4.01:1 |
| White text | 5.23:1 |
Values
| HEX | #37738F |
| RGB | rgb(55, 115, 143) |
| HSL | hsl(199, 44%, 39%) |
| OKLCH | oklch(52.8% 0.076 230.8) |
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 #37738F | 5.23:1 | AA | Lc -81.2 | Fine for body text |
| Black text on #37738F | 4.01:1 | AA large text | Lc 28.3 | Dividers and decoration only |
| #37738F text on white | 5.23:1 | AA | Lc 75.8 | Fine for body text |
| #37738F text on black | 4.01:1 | AA large text | Lc -25.9 | 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 600.
-
Step 50
50
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E4EBEF
oklch(93.6% 0.009 232.4)
-
Step 200
200
#CDDCE4
oklch(88.6% 0.02 230.7)
-
Step 300
300
#ABC5D3
oklch(80.8% 0.034 231.3)
-
Step 400
400
#7EA7BD
oklch(70.6% 0.055 231.9)
-
Step 500
500
#5B92AC
oklch(63.2% 0.07 229.7)
-
Step 600
600 (this color)
#37738F
oklch(52.8% 0.076 230.8)
-
Step 700
700
#316882
oklch(49.1% 0.071 231.2)
-
Step 800
800
#2A5569
oklch(42.8% 0.058 230.3)
-
Step 900
900
#274655
oklch(37.7% 0.045 230.6)
-
Step 950
950
#172932
oklch(27% 0.029 231)
#37738F 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) | #657190 | 0.053 |
| Deuteranopia (no green cones) | #59688F | 0.047 |
| Tritanopia (no blue cones) | #007B7C | 0.052 |
| Achromatopsia (no color) | #6C6C6C | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37738F
#37738F
oklch(52.8% 0.076 230.8)
- #8E5E42
#8E5E42
oklch(52.7% 0.075 50.7)
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 #37738F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.024
- Sea Blue #047495 ΔE 0.025
- Muted Blue #3B719F ΔE 0.029
- Dull Blue #49759C ΔE 0.029
- Ocean #017B92 ΔE 0.030
- Ocean Blue #03719C ΔE 0.033
- Cerulean #457B9D ΔE 0.034
- Stormy Blue #507B9C ΔE 0.041
Use #37738F 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.