#31DDFB
Closest named color: Aqua Blue (#02D8E9). oklch(82.8% 0.136 213), rgb(49, 221, 251).
Aa
Black text reads best on this color (12.86:1).
About this color
#31DDFB is a light, moderately saturated teal or cyan. In OKLCH its lightness is 83%, its chroma 0.136 and its hue 213°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Blue (#02D8E9), ΔE 0.030 away. Black text reads best on it, at 12.86:1.
| Hue family | Teals and cyans |
| Lightness | light (83%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Aqua Blue (#02D8E9) |
| Black text | 12.86:1 |
| White text | 1.63:1 |
Values
| HEX | #31DDFB |
| RGB | rgb(49, 221, 251) |
| HSL | hsl(189, 96%, 59%) |
| OKLCH | oklch(82.8% 0.136 213) |
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 #31DDFB | 1.63:1 | Fails | Lc -31.2 | Non-text elements, placeholder text |
| Black text on #31DDFB | 12.86:1 | AAA | Lc 76.1 | Fine for body text |
| #31DDFB text on white | 1.63:1 | Fails | Lc 27.7 | Dividers and decoration only |
| #31DDFB text on black | 12.86:1 | AAA | Lc -75.3 | Fine for body text |
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 300.
-
Step 50
50
#E8F9FD
oklch(97.1% 0.019 213.4)
-
Step 100
100
#CDF1FA
oklch(93.5% 0.039 214.5)
-
Step 200
200
#9EE7F7
oklch(88.5% 0.075 212.9)
-
Step 300
300 (this color)
#31DDFB
oklch(82.8% 0.136 213)
-
Step 400
400
#00B4CE
oklch(70.7% 0.124 212.8)
-
Step 500
500
#009AB1
oklch(63% 0.11 213.1)
-
Step 600
600
#008295
oklch(55.7% 0.097 212.5)
-
Step 700
700
#006D7E
oklch(49.1% 0.086 213.3)
-
Step 800
800
#005967
oklch(42.6% 0.075 213)
-
Step 900
900
#004A56
oklch(37.6% 0.066 213)
-
Step 950
950
#002C34
oklch(26.9% 0.047 213.2)
#31DDFB 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) | #C7D5FD | 0.125 |
| Deuteranopia (no green cones) | #ACC2FB | 0.113 |
| Tritanopia (no blue cones) | #00E9E6 | 0.052 |
| Achromatopsia (no color) | #CACACA | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31DDFB
#31DDFB
oklch(82.8% 0.136 213)
- #FFB09E
#FFB09E
oklch(82.8% 0.097 33.3)
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 #31DDFB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Blue #02D8E9 ΔE 0.030
- Bright Sky Blue #02CCFE ΔE 0.051
- Vivid Sky Blue #4CC9F0 ΔE 0.052
- Robin's Egg #6DEDFD ΔE 0.058
- Sky Blue #87CEEB ΔE 0.061
- Light Sky Blue #87CEFA ΔE 0.063
- Turquoise #40E0D0 ΔE 0.065
- Lightblue #7BC8F6 ΔE 0.065
Use #31DDFB 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.