#31738C
Closest named color: Sea Blue (#047495). oklch(52.4% 0.077 226.1), rgb(49, 115, 140).
Aa
White text reads best on this color (5.30:1).
About this color
#31738C is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 52%, its chroma 0.077 and its hue 226°. Its hue sits on the cool side of the wheel. The nearest named color is Sea Blue (#047495), ΔE 0.022 away. White text reads best on it, at 5.30:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Sea Blue (#047495) |
| Black text | 3.96:1 |
| White text | 5.30:1 |
Values
| HEX | #31738C |
| RGB | rgb(49, 115, 140) |
| HSL | hsl(196, 48%, 37%) |
| OKLCH | oklch(52.4% 0.077 226.1) |
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 #31738C | 5.30:1 | AA | Lc -81.5 | Fine for body text |
| Black text on #31738C | 3.96:1 | AA large text | Lc 27.9 | Dividers and decoration only |
| #31738C text on white | 5.30:1 | AA | Lc 76.1 | Fine for body text |
| #31738C text on black | 3.96:1 | AA large text | Lc -25.6 | 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
#E3EBEF
oklch(93.5% 0.01 228.9)
-
Step 200
200
#CDDCE3
oklch(88.5% 0.019 227.3)
-
Step 300
300
#AAC6D2
oklch(81% 0.035 225.6)
-
Step 400
400
#7CA8BB
oklch(70.7% 0.055 226.4)
-
Step 500
500
#5893AA
oklch(63.2% 0.071 225)
-
Step 600
600 (this color)
#31738C
oklch(52.4% 0.077 226.1)
-
Step 700
700
#2D6980
oklch(49.1% 0.072 226.3)
-
Step 800
800
#265668
oklch(42.8% 0.06 225.4)
-
Step 900
900
#244754
oklch(37.7% 0.046 224.4)
-
Step 950
950
#162931
oklch(26.8% 0.029 226.7)
#31738C 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) | #65718D | 0.058 |
| Deuteranopia (no green cones) | #59678C | 0.052 |
| Tritanopia (no blue cones) | #007A7B | 0.045 |
| Achromatopsia (no color) | #6B6B6B | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31738C
#31738C
oklch(52.4% 0.077 226.1)
- #8F5C43
#8F5C43
oklch(52.5% 0.077 46.7)
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 #31738C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Blue #047495 ΔE 0.022
- Ocean #017B92 ΔE 0.027
- Metallic Blue #4F738E ΔE 0.030
- Ocean Blue #03719C ΔE 0.034
- Muted Blue #3B719F ΔE 0.035
- Deep Aqua #08787F ΔE 0.036
- Dull Blue #49759C ΔE 0.036
- Cerulean #457B9D ΔE 0.039
Use #31738C 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.