#31708D
Closest named color: Sea Blue (#047495). oklch(51.7% 0.079 230.9), rgb(49, 112, 141).
Aa
White text reads best on this color (5.47:1).
About this color
#31708D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.079 and its hue 231°. 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 5.47:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Sea Blue (#047495) |
| Black text | 3.83:1 |
| White text | 5.47:1 |
Values
| HEX | #31708D |
| RGB | rgb(49, 112, 141) |
| HSL | hsl(199, 48%, 37%) |
| OKLCH | oklch(51.7% 0.079 230.9) |
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 #31708D | 5.47:1 | AA | Lc -82.5 | Fine for body text |
| Black text on #31708D | 3.83:1 | AA large text | Lc 26.9 | Dividers and decoration only |
| #31708D text on white | 5.47:1 | AA | Lc 77.1 | Fine for body text |
| #31708D text on black | 3.83:1 | AA large text | Lc -24.6 | 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 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
#CCDCE5
oklch(88.5% 0.021 232.2)
-
Step 300
300
#A9C6D5
oklch(81% 0.038 230.3)
-
Step 400
400
#79A8C0
oklch(70.7% 0.061 230.9)
-
Step 500
500
#5592B0
oklch(63% 0.078 231.1)
-
Step 600
600
#377C9C
oklch(55.6% 0.085 231.1)
-
Step 700
700 (this color)
#31708D
oklch(51.7% 0.079 230.9)
-
Step 800
800
#24556C
oklch(42.6% 0.065 231.4)
-
Step 900
900
#224658
oklch(37.6% 0.052 232.2)
-
Step 950
950
#152933
oklch(26.9% 0.032 231.4)
#31708D 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) | #616E8E | 0.053 |
| Deuteranopia (no green cones) | #55658D | 0.047 |
| Tritanopia (no blue cones) | #00787A | 0.050 |
| Achromatopsia (no color) | #696969 | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31708D
#31708D
oklch(51.7% 0.079 230.9)
- #8C5A3D
#8C5A3D
oklch(51.6% 0.079 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 #31708D, 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 Blue #03719C ΔE 0.029
- Muted Blue #3B719F ΔE 0.031
- Metallic Blue #4F738E ΔE 0.033
- Ocean #017B92 ΔE 0.034
- Dull Blue #49759C ΔE 0.037
- Denim #3B638C ΔE 0.039
- Peacock Blue #016795 ΔE 0.042
Use #31708D 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.