#31748B
Closest named color: Sea Blue (#047495). oklch(52.6% 0.076 223.8), rgb(49, 116, 139).
Aa
White text reads best on this color (5.24:1).
About this color
#31748B is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 53%, its chroma 0.076 and its hue 224°. Its hue sits on the cool side of the wheel. The nearest named color is Sea Blue (#047495), ΔE 0.024 away. White text reads best on it, at 5.24:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Sea Blue (#047495) |
| Black text | 4.00:1 |
| White text | 5.24:1 |
Values
| HEX | #31748B |
| RGB | rgb(49, 116, 139) |
| HSL | hsl(195, 48%, 37%) |
| OKLCH | oklch(52.6% 0.076 223.8) |
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 #31748B | 5.24:1 | AA | Lc -81.2 | Fine for body text |
| Black text on #31748B | 4.00:1 | AA large text | Lc 28.2 | Dividers and decoration only |
| #31748B text on white | 5.24:1 | AA | Lc 75.8 | Fine for body text |
| #31748B text on black | 4.00:1 | AA large text | Lc -25.9 | 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
#CCDCE2
oklch(88.4% 0.019 222.2)
-
Step 300
300
#AAC6D1
oklch(80.9% 0.034 223.5)
-
Step 400
400
#7BA9BA
oklch(70.8% 0.055 222.8)
-
Step 500
500
#5893A9
oklch(63.1% 0.07 224)
-
Step 600
600 (this color)
#31748B
oklch(52.6% 0.076 223.8)
-
Step 700
700
#2C697E
oklch(49% 0.071 223.8)
-
Step 800
800
#265667
oklch(42.7% 0.059 224)
-
Step 900
900
#244754
oklch(37.7% 0.046 224.4)
-
Step 950
950
#162A31
oklch(27.1% 0.029 222.4)
#31748B 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) | #67718C | 0.060 |
| Deuteranopia (no green cones) | #5A688B | 0.053 |
| Tritanopia (no blue cones) | #007B7B | 0.044 |
| Achromatopsia (no color) | #6C6C6C | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31748B
#31748B
oklch(52.6% 0.076 223.8)
- #905C46
#905C46
oklch(52.7% 0.076 43.6)
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 #31748B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Blue #047495 ΔE 0.024
- Ocean #017B92 ΔE 0.025
- Metallic Blue #4F738E ΔE 0.030
- Deep Aqua #08787F ΔE 0.033
- Ocean Blue #03719C ΔE 0.036
- Dull Blue #49759C ΔE 0.037
- Muted Blue #3B719F ΔE 0.038
- Cerulean #457B9D ΔE 0.039
Use #31748B 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.