#37718B
Closest named color: Sea Blue (#047495). oklch(52.1% 0.073 229.6), rgb(55, 113, 139).
Aa
White text reads best on this color (5.38:1).
About this color
#37718B is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 52%, its chroma 0.073 and its hue 230°. Its hue sits on the cool side of the wheel. The nearest named color is Sea Blue (#047495), ΔE 0.027 away. White text reads best on it, at 5.38:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Sea Blue (#047495) |
| Black text | 3.89:1 |
| White text | 5.38:1 |
Values
| HEX | #37718B |
| RGB | rgb(55, 113, 139) |
| HSL | hsl(199, 43%, 38%) |
| OKLCH | oklch(52.1% 0.073 229.6) |
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 #37718B | 5.38:1 | AA | Lc -82.0 | Fine for body text |
| Black text on #37718B | 3.89:1 | AA large text | Lc 27.4 | Dividers and decoration only |
| #37718B text on white | 5.38:1 | AA | Lc 76.7 | Fine for body text |
| #37718B text on black | 3.89:1 | AA large text | Lc -25.1 | 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 700.
-
Step 50
50
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E3EBEF
oklch(93.5% 0.01 228.9)
-
Step 200
200
#CDDCE4
oklch(88.6% 0.02 230.7)
-
Step 300
300
#AAC5D3
oklch(80.8% 0.035 230.3)
-
Step 400
400
#7CA8BD
oklch(70.7% 0.056 229)
-
Step 500
500
#5992AD
oklch(63.1% 0.072 229.9)
-
Step 600
600
#3C7C98
oklch(55.6% 0.078 229.1)
-
Step 700
700 (this color)
#37718B
oklch(52.1% 0.073 229.6)
-
Step 800
800
#27556A
oklch(42.7% 0.061 230.2)
-
Step 900
900
#254656
oklch(37.6% 0.047 230.9)
-
Step 950
950
#162932
oklch(26.9% 0.03 229.7)
#37718B 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) | #646F8C | 0.052 |
| Deuteranopia (no green cones) | #58668B | 0.046 |
| Tritanopia (no blue cones) | #007879 | 0.049 |
| Achromatopsia (no color) | #6A6A6A | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37718B
#37718B
oklch(52.1% 0.073 229.6)
- #8B5C42
#8B5C42
oklch(52% 0.073 49.5)
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 #37718B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Blue #047495 ΔE 0.027
- Metallic Blue #4F738E ΔE 0.027
- Muted Blue #3B719F ΔE 0.033
- Ocean #017B92 ΔE 0.034
- Dull Blue #49759C ΔE 0.035
- Ocean Blue #03719C ΔE 0.035
- Deep Aqua #08787F ΔE 0.041
- Cerulean #457B9D ΔE 0.041
Use #37718B 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.