#31C8EA
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(77.2% 0.128 217.3), rgb(49, 200, 234).
Aa
Black text reads best on this color (10.58:1).
About this color
#31C8EA is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 77%, its chroma 0.128 and its hue 217°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.017 away. Black text reads best on it, at 10.58:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 10.58:1 |
| White text | 1.98:1 |
Values
| HEX | #31C8EA |
| RGB | rgb(49, 200, 234) |
| HSL | hsl(191, 81%, 55%) |
| OKLCH | oklch(77.2% 0.128 217.3) |
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 #31C8EA | 1.98:1 | Fails | Lc -42.3 | Non-text elements, placeholder text |
| Black text on #31C8EA | 10.58:1 | AAA | Lc 66.0 | Content text, not long reading |
| #31C8EA text on white | 1.98:1 | Fails | Lc 37.9 | Non-text elements, placeholder text |
| #31C8EA text on black | 10.58:1 | AAA | Lc -64.5 | 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
#E9F9FD
oklch(97.1% 0.018 214.4)
-
Step 100
100
#CFF1FA
oklch(93.7% 0.037 215.5)
-
Step 200
200
#A3E5F8
oklch(88.4% 0.071 217.6)
-
Step 300
300 (this color)
#31C8EA
oklch(77.2% 0.128 217.3)
-
Step 400
400
#00B3D4
oklch(70.7% 0.127 217.3)
-
Step 500
500
#0099B6
oklch(63% 0.113 217.6)
-
Step 600
600
#008199
oklch(55.6% 0.099 216.9)
-
Step 700
700
#006C81
oklch(49% 0.088 217.4)
-
Step 800
800
#00596A
oklch(42.8% 0.076 216.6)
-
Step 900
900
#004A59
oklch(37.7% 0.067 217.2)
-
Step 950
950
#002C36
oklch(27% 0.048 217.4)
#31C8EA 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) | #B2C2EC | 0.111 |
| Deuteranopia (no green cones) | #99B0EA | 0.099 |
| Tritanopia (no blue cones) | #00D4D3 | 0.055 |
| Achromatopsia (no color) | #B8B8B8 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31C8EA
#31C8EA
oklch(77.2% 0.128 217.3)
- #FA9679
#FA9679
oklch(77.1% 0.128 37)
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 #31C8EA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.017
- Bright Sky Blue #02CCFE ΔE 0.028
- Aqua Blue #02D8E9 ΔE 0.045
- Deep Sky Blue #00BFFF ΔE 0.046
- Dark Turquoise #00CED1 ΔE 0.047
- Lightblue #7BC8F6 ΔE 0.054
- Medium Turquoise #48D1CC ΔE 0.058
- Sky #82CAFC ΔE 0.065
Use #31C8EA 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.