#31B7EB
Closest named color: Deep Sky Blue (#00BFFF). oklch(73.2% 0.133 229.6), rgb(49, 183, 235).
Aa
Black text reads best on this color (9.10:1).
About this color
#31B7EB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 73%, its chroma 0.133 and its hue 230°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.031 away. Black text reads best on it, at 9.10:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.10:1 |
| White text | 2.30:1 |
Values
| HEX | #31B7EB |
| RGB | rgb(49, 183, 235) |
| HSL | hsl(197, 82%, 56%) |
| OKLCH | oklch(73.2% 0.133 229.6) |
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 #31B7EB | 2.30:1 | Fails | Lc -49.9 | Large or bold text, headings |
| Black text on #31B7EB | 9.10:1 | AAA | Lc 58.9 | Large or bold text, headings |
| #31B7EB text on white | 2.30:1 | Fails | Lc 45.0 | Large or bold text, headings |
| #31B7EB text on black | 9.10:1 | AAA | Lc -57.1 | 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
#EEF7FC
oklch(97.1% 0.012 231.7)
-
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
#87CBEC
oklch(80.9% 0.083 230.1)
-
Step 400
400 (this color)
#31B7EB
oklch(73.2% 0.133 229.6)
-
Step 500
500
#0096C6
oklch(63% 0.126 229.9)
-
Step 600
600
#007EA7
oklch(55.5% 0.111 230)
-
Step 700
700
#006A8D
oklch(49.1% 0.098 229.8)
-
Step 800
800
#005774
oklch(42.7% 0.085 229.4)
-
Step 900
900
#004861
oklch(37.6% 0.075 229.8)
-
Step 950
950
#002B3B
oklch(27% 0.053 228.8)
#31B7EB 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) | #9CB4EE | 0.092 |
| Deuteranopia (no green cones) | #84A3EA | 0.079 |
| Tritanopia (no blue cones) | #00C5C8 | 0.075 |
| Achromatopsia (no color) | #ABABAB | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31B7EB
#31B7EB
oklch(73.2% 0.133 229.6)
- #EA8D58
#EA8D58
oklch(73.1% 0.132 49.3)
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 #31B7EB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.031
- Vivid Sky Blue #4CC9F0 ΔE 0.054
- Bright Sky Blue #02CCFE ΔE 0.057
- Turquoise Blue #06B1C4 ΔE 0.060
- Lightblue #7BC8F6 ΔE 0.076
- Carolina Blue #8AB8FE ΔE 0.078
- Dark Turquoise #00CED1 ΔE 0.085
- Sky #82CAFC ΔE 0.087
Use #31B7EB 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.