#31B8EB
Closest named color: Deep Sky Blue (#00BFFF). oklch(73.5% 0.132 229), rgb(49, 184, 235).
Aa
Black text reads best on this color (9.18:1).
About this color
#31B8EB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 73%, its chroma 0.132 and its hue 229°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.030 away. Black text reads best on it, at 9.18:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.18:1 |
| White text | 2.28:1 |
Values
| HEX | #31B8EB |
| RGB | rgb(49, 184, 235) |
| HSL | hsl(196, 82%, 56%) |
| OKLCH | oklch(73.5% 0.132 229) |
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 #31B8EB | 2.28:1 | Fails | Lc -49.5 | Large or bold text, headings |
| Black text on #31B8EB | 9.18:1 | AAA | Lc 59.3 | Large or bold text, headings |
| #31B8EB text on white | 2.28:1 | Fails | Lc 44.6 | Non-text elements, placeholder text |
| #31B8EB text on black | 9.18:1 | AAA | Lc -57.5 | Large or bold text, headings |
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 400.
-
Step 50
50
#EEF7FB
oklch(97.1% 0.011 226)
-
Step 100
100
#DAEDF7
oklch(93.5% 0.024 230.4)
-
Step 200
200
#BBE0F2
oklch(88.6% 0.046 228.9)
-
Step 300
300
#87CBEB
oklch(80.8% 0.082 229.2)
-
Step 400
400 (this color)
#31B8EB
oklch(73.5% 0.132 229)
-
Step 500
500
#0097C5
oklch(63.2% 0.124 228.7)
-
Step 600
600
#007EA6
oklch(55.5% 0.11 229.3)
-
Step 700
700
#006A8C
oklch(49% 0.097 229.1)
-
Step 800
800
#005773
oklch(42.7% 0.084 228.5)
-
Step 900
900
#004861
oklch(37.6% 0.075 229.8)
-
Step 950
950
#002B3B
oklch(27% 0.053 228.8)
#31B8EB 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) | #9DB5ED | 0.092 |
| Deuteranopia (no green cones) | #85A4EA | 0.080 |
| Tritanopia (no blue cones) | #00C6C9 | 0.074 |
| Achromatopsia (no color) | #ABABAB | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31B8EB
#31B8EB
oklch(73.5% 0.132 229)
- #EB8E5A
#EB8E5A
oklch(73.4% 0.132 48.9)
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 #31B8EB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.030
- Vivid Sky Blue #4CC9F0 ΔE 0.051
- Bright Sky Blue #02CCFE ΔE 0.054
- Turquoise Blue #06B1C4 ΔE 0.061
- Lightblue #7BC8F6 ΔE 0.074
- Carolina Blue #8AB8FE ΔE 0.078
- Dark Turquoise #00CED1 ΔE 0.082
- Sky #82CAFC ΔE 0.085
Use #31B8EB 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.