#31718D
Closest named color: Sea Blue (#047495). oklch(51.9% 0.078 229.7), rgb(49, 113, 141).
Aa
White text reads best on this color (5.41:1).
About this color
#31718D is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 52%, its chroma 0.078 and its hue 230°. 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 5.41:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Sea Blue (#047495) |
| Black text | 3.87:1 |
| White text | 5.41:1 |
Values
| HEX | #31718D |
| RGB | rgb(49, 113, 141) |
| HSL | hsl(198, 48%, 37%) |
| OKLCH | oklch(51.9% 0.078 229.7) |
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 #31718D | 5.41:1 | AA | Lc -82.1 | Fine for body text |
| Black text on #31718D | 3.87:1 | AA large text | Lc 27.3 | Dividers and decoration only |
| #31718D text on white | 5.41:1 | AA | Lc 76.8 | Fine for body text |
| #31718D text on black | 3.87:1 | AA large text | Lc -25.0 | 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
#E3EBF0
oklch(93.5% 0.011 234.8)
-
Step 200
200
#CCDCE4
oklch(88.5% 0.02 229.1)
-
Step 300
300
#A8C6D5
oklch(80.9% 0.039 229.5)
-
Step 400
400
#79A8BF
oklch(70.6% 0.06 229.8)
-
Step 500
500
#5492AF
oklch(63% 0.078 229.9)
-
Step 600
600
#367C9B
oklch(55.5% 0.085 230)
-
Step 700
700 (this color)
#31718D
oklch(51.9% 0.078 229.7)
-
Step 800
800
#23556C
oklch(42.6% 0.065 231)
-
Step 900
900
#224757
oklch(37.8% 0.05 228.4)
-
Step 950
950
#152933
oklch(26.9% 0.032 231.4)
#31718D 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) | #636F8E | 0.056 |
| Deuteranopia (no green cones) | #56668D | 0.048 |
| Tritanopia (no blue cones) | #00797A | 0.050 |
| Achromatopsia (no color) | #6A6A6A | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31718D
#31718D
oklch(51.9% 0.078 229.7)
- #8D5B3E
#8D5B3E
oklch(51.9% 0.078 50.4)
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 #31718D, 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 Blue #03719C ΔE 0.030
- Metallic Blue #4F738E ΔE 0.031
- Muted Blue #3B719F ΔE 0.031
- Ocean #017B92 ΔE 0.032
- Dull Blue #49759C ΔE 0.036
- Deep Aqua #08787F ΔE 0.040
- Denim #3B638C ΔE 0.042
Use #31718D 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.