#31D5FB
Closest named color: Bright Sky Blue (#02CCFE). oklch(80.9% 0.136 218.2), rgb(49, 213, 251).
Aa
Black text reads best on this color (12.04:1).
About this color
#31D5FB is a light, moderately saturated teal or cyan. In OKLCH its lightness is 81%, its chroma 0.136 and its hue 218°. Its hue sits on the cool side of the wheel. The nearest named color is Bright Sky Blue (#02CCFE), ΔE 0.030 away. Black text reads best on it, at 12.04:1.
| Hue family | Teals and cyans |
| Lightness | light (81%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Bright Sky Blue (#02CCFE) |
| Black text | 12.04:1 |
| White text | 1.74:1 |
Values
| HEX | #31D5FB |
| RGB | rgb(49, 213, 251) |
| HSL | hsl(191, 96%, 59%) |
| OKLCH | oklch(80.9% 0.136 218.2) |
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 #31D5FB | 1.74:1 | Fails | Lc -35.1 | Non-text elements, placeholder text |
| Black text on #31D5FB | 12.04:1 | AAA | Lc 72.6 | Content text, not long reading |
| #31D5FB text on white | 1.74:1 | Fails | Lc 31.2 | Non-text elements, placeholder text |
| #31D5FB text on black | 12.04:1 | AAA | Lc -71.5 | Content text, not long reading |
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
#E9F9FE
oklch(97.2% 0.018 218.4)
-
Step 100
100
#CEF1FC
oklch(93.7% 0.039 218.7)
-
Step 200
200
#9FE6FB
oklch(88.5% 0.076 218.3)
-
Step 300
300 (this color)
#31D5FB
oklch(80.9% 0.136 218.2)
-
Step 400
400
#00B3D5
oklch(70.8% 0.127 217.9)
-
Step 500
500
#0099B7
oklch(63.1% 0.114 218.3)
-
Step 600
600
#00819A
oklch(55.7% 0.1 217.7)
-
Step 700
700
#006C82
oklch(49.1% 0.088 218.4)
-
Step 800
800
#00596B
oklch(42.8% 0.077 217.7)
-
Step 900
900
#004A59
oklch(37.7% 0.067 217.2)
-
Step 950
950
#002C36
oklch(27% 0.048 217.4)
#31D5FB 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) | #BDCFFD | 0.117 |
| Deuteranopia (no green cones) | #A3BCFB | 0.104 |
| Tritanopia (no blue cones) | #00E2E1 | 0.060 |
| Achromatopsia (no color) | #C4C4C4 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31D5FB
#31D5FB
oklch(80.9% 0.136 218.2)
- #FFA78B
#FFA78B
oklch(80.9% 0.112 38.4)
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 #31D5FB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bright Sky Blue #02CCFE ΔE 0.030
- Aqua Blue #02D8E9 ΔE 0.032
- Vivid Sky Blue #4CC9F0 ΔE 0.032
- Lightblue #7BC8F6 ΔE 0.052
- Sky Blue #87CEEB ΔE 0.056
- Sky #82CAFC ΔE 0.057
- Light Sky Blue #87CEFA ΔE 0.057
- Dark Turquoise #00CED1 ΔE 0.062
Use #31D5FB 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.