#31CAF0
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(77.9% 0.131 219.4), rgb(49, 202, 240).
Aa
Black text reads best on this color (10.83:1).
About this color
#31CAF0 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 78%, its chroma 0.131 and its hue 219°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.012 away. Black text reads best on it, at 10.83:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (78%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 10.83:1 |
| White text | 1.93:1 |
Values
| HEX | #31CAF0 |
| RGB | rgb(49, 202, 240) |
| HSL | hsl(192, 86%, 57%) |
| OKLCH | oklch(77.9% 0.131 219.4) |
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 #31CAF0 | 1.93:1 | Fails | Lc -41.0 | Non-text elements, placeholder text |
| Black text on #31CAF0 | 10.83:1 | AAA | Lc 67.2 | Content text, not long reading |
| #31CAF0 text on white | 1.93:1 | Fails | Lc 36.7 | Non-text elements, placeholder text |
| #31CAF0 text on black | 10.83:1 | AAA | Lc -65.8 | 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
#CFF1FB
oklch(93.7% 0.038 217.4)
-
Step 200
200
#A2E5FA
oklch(88.4% 0.073 219.4)
-
Step 300
300 (this color)
#31CAF0
oklch(77.9% 0.131 219.4)
-
Step 400
400
#00B2D7
oklch(70.6% 0.128 219.8)
-
Step 500
500
#0099B9
oklch(63.1% 0.115 219.7)
-
Step 600
600
#00809B
oklch(55.5% 0.101 219.5)
-
Step 700
700
#006C83
oklch(49.1% 0.089 219.3)
-
Step 800
800
#00586C
oklch(42.6% 0.078 220.2)
-
Step 900
900
#004A5A
oklch(37.8% 0.068 218.5)
-
Step 950
950
#002C37
oklch(27.1% 0.049 219.4)
#31CAF0 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) | #B2C4F2 | 0.109 |
| Deuteranopia (no green cones) | #9AB2F0 | 0.099 |
| Tritanopia (no blue cones) | #00D6D6 | 0.059 |
| Achromatopsia (no color) | #BABABA | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31CAF0
#31CAF0
oklch(77.9% 0.131 219.4)
- #FE9876
#FE9876
oklch(77.9% 0.132 39.2)
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 #31CAF0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.012
- Bright Sky Blue #02CCFE ΔE 0.020
- Aqua Blue #02D8E9 ΔE 0.043
- Deep Sky Blue #00BFFF ΔE 0.044
- Lightblue #7BC8F6 ΔE 0.050
- Dark Turquoise #00CED1 ΔE 0.052
- Sky #82CAFC ΔE 0.060
- Medium Turquoise #48D1CC ΔE 0.062
Use #31CAF0 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.