#5BCFE9
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(79.8% 0.11 214.9), rgb(91, 207, 233).
Aa
Black text reads best on this color (11.54:1).
About this color
#5BCFE9 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 80%, its chroma 0.110 and its hue 215°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.025 away. Black text reads best on it, at 11.54:1.
| Hue family | Teals and cyans |
| Lightness | light (80%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 11.54:1 |
| White text | 1.81:1 |
Values
| HEX | #5BCFE9 |
| RGB | rgb(91, 207, 233) |
| HSL | hsl(191, 76%, 64%) |
| OKLCH | oklch(79.8% 0.11 214.9) |
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 #5BCFE9 | 1.81:1 | Fails | Lc -37.7 | Non-text elements, placeholder text |
| Black text on #5BCFE9 | 11.54:1 | AAA | Lc 70.2 | Content text, not long reading |
| #5BCFE9 text on white | 1.81:1 | Fails | Lc 33.7 | Non-text elements, placeholder text |
| #5BCFE9 text on black | 11.54:1 | AAA | Lc -68.9 | 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
#EBF8FC
oklch(97.1% 0.015 218)
-
Step 100
100
#D3F0F7
oklch(93.6% 0.032 213.9)
-
Step 200
200
#ABE4F2
oklch(88.4% 0.061 214.5)
-
Step 300
300 (this color)
#5BCFE9
oklch(79.8% 0.11 214.9)
-
Step 400
400
#00B3D1
oklch(70.6% 0.125 215.4)
-
Step 500
500
#009AB3
oklch(63.1% 0.111 214.6)
-
Step 600
600
#008197
oklch(55.5% 0.098 215.2)
-
Step 700
700
#006D7F
oklch(49.2% 0.087 214.3)
-
Step 800
800
#005969
oklch(42.7% 0.076 215.4)
-
Step 900
900
#004A57
oklch(37.6% 0.066 214.5)
-
Step 950
950
#002C35
oklch(27% 0.048 215.4)
#5BCFE9 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) | #BCC9EB | 0.098 |
| Deuteranopia (no green cones) | #A8B9E9 | 0.090 |
| Tritanopia (no blue cones) | #00D9D7 | 0.053 |
| Achromatopsia (no color) | #C0C0C0 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5BCFE9
#5BCFE9
oklch(79.8% 0.11 214.9)
- #FBA38D
#FBA38D
oklch(79.8% 0.11 34.7)
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 #5BCFE9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.025
- Aqua Blue #02D8E9 ΔE 0.035
- Sky Blue #87CEEB ΔE 0.037
- Lightblue #7BC8F6 ΔE 0.040
- Bright Sky Blue #02CCFE ΔE 0.044
- Light Sky Blue #87CEFA ΔE 0.047
- Medium Turquoise #48D1CC ΔE 0.047
- Sky #82CAFC ΔE 0.048
Use #5BCFE9 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.