#31738E
Closest named color: Sea Blue (#047495). oklch(52.5% 0.079 228), rgb(49, 115, 142).
Aa
White text reads best on this color (5.28:1).
About this color
#31738E is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 52%, its chroma 0.079 and its hue 228°. Its hue sits on the cool side of the wheel. The nearest named color is Sea Blue (#047495), ΔE 0.021 away. White text reads best on it, at 5.28:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Sea Blue (#047495) |
| Black text | 3.97:1 |
| White text | 5.28:1 |
Values
| HEX | #31738E |
| RGB | rgb(49, 115, 142) |
| HSL | hsl(197, 49%, 37%) |
| OKLCH | oklch(52.5% 0.079 228) |
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 #31738E | 5.28:1 | AA | Lc -81.4 | Fine for body text |
| Black text on #31738E | 3.97:1 | AA large text | Lc 28.0 | Dividers and decoration only |
| #31738E text on white | 5.28:1 | AA | Lc 76.1 | Fine for body text |
| #31738E text on black | 3.97:1 | AA large text | Lc -25.7 | 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
#CCDCE3
oklch(88.5% 0.02 225.7)
-
Step 300
300
#AAC6D3
oklch(81% 0.035 227.5)
-
Step 400
400
#7BA8BD
oklch(70.7% 0.057 228.4)
-
Step 500
500
#5892AC
oklch(63% 0.072 228.5)
-
Step 600
600 (this color)
#31738E
oklch(52.5% 0.079 228)
-
Step 700
700
#2C6981
oklch(49.1% 0.073 227.1)
-
Step 800
800
#265569
oklch(42.6% 0.061 228.5)
-
Step 900
900
#244755
oklch(37.8% 0.047 226.2)
-
Step 950
950
#162932
oklch(26.9% 0.03 229.7)
#31738E 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) | #65718F | 0.057 |
| Deuteranopia (no green cones) | #58678E | 0.051 |
| Tritanopia (no blue cones) | #007B7C | 0.048 |
| Achromatopsia (no color) | #6C6C6C | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31738E
#31738E
oklch(52.5% 0.079 228)
- #8F5C41
#8F5C41
oklch(52.4% 0.078 48.4)
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 #31738E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Blue #047495 ΔE 0.021
- Ocean #017B92 ΔE 0.027
- Metallic Blue #4F738E ΔE 0.029
- Ocean Blue #03719C ΔE 0.031
- Muted Blue #3B719F ΔE 0.032
- Dull Blue #49759C ΔE 0.034
- Cerulean #457B9D ΔE 0.038
- Deep Aqua #08787F ΔE 0.038
Use #31738E 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.