#31DEF5
Closest named color: Aqua Blue (#02D8E9). oklch(82.8% 0.134 208.9), rgb(49, 222, 245).
Aa
Black text reads best on this color (12.89:1).
About this color
#31DEF5 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 83%, its chroma 0.134 and its hue 209°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Blue (#02D8E9), ΔE 0.025 away. Black text reads best on it, at 12.89:1.
| Hue family | Teals and cyans |
| Lightness | light (83%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Aqua Blue (#02D8E9) |
| Black text | 12.89:1 |
| White text | 1.62:1 |
Values
| HEX | #31DEF5 |
| RGB | rgb(49, 222, 245) |
| HSL | hsl(187, 91%, 58%) |
| OKLCH | oklch(82.8% 0.134 208.9) |
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 #31DEF5 | 1.62:1 | Fails | Lc -31.1 | Non-text elements, placeholder text |
| Black text on #31DEF5 | 12.89:1 | AAA | Lc 76.3 | Fine for body text |
| #31DEF5 text on white | 1.62:1 | Fails | Lc 27.5 | Dividers and decoration only |
| #31DEF5 text on black | 12.89:1 | AAA | Lc -75.4 | 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
#E8F9FC
oklch(97% 0.018 209.4)
-
Step 100
100
#CDF2F8
oklch(93.7% 0.039 208.4)
-
Step 200
200
#9EE7F4
oklch(88.4% 0.074 209.8)
-
Step 300
300 (this color)
#31DEF5
oklch(82.8% 0.134 208.9)
-
Step 400
400
#00B5C9
oklch(70.8% 0.122 208.7)
-
Step 500
500
#009BAD
oklch(63.1% 0.109 209.2)
-
Step 600
600
#008291
oklch(55.5% 0.096 208.9)
-
Step 700
700
#006D7A
oklch(49% 0.084 209.1)
-
Step 800
800
#005A64
oklch(42.8% 0.073 207.9)
-
Step 900
900
#004B54
oklch(37.8% 0.065 208.5)
-
Step 950
950
#002C33
oklch(26.9% 0.047 211.1)
#31DEF5 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) | #C9D5F6 | 0.127 |
| Deuteranopia (no green cones) | #B0C3F5 | 0.116 |
| Tritanopia (no blue cones) | #00E9E5 | 0.044 |
| Achromatopsia (no color) | #CBCBCB | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31DEF5
#31DEF5
oklch(82.8% 0.134 208.9)
- #FFAFA3
#FFAFA3
oklch(82.8% 0.096 28.7)
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 #31DEF5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Blue #02D8E9 ΔE 0.025
- Turquoise #40E0D0 ΔE 0.055
- Robin's Egg #6DEDFD ΔE 0.056
- Vivid Sky Blue #4CC9F0 ΔE 0.056
- Bright Sky Blue #02CCFE ΔE 0.058
- Medium Turquoise #48D1CC ΔE 0.058
- Sky Blue #87CEEB ΔE 0.062
- Dark Turquoise #00CED1 ΔE 0.063
Use #31DEF5 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.