#5BBFEF
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(76.4% 0.116 231.9), rgb(91, 191, 239).
Aa
Black text reads best on this color (10.14:1).
About this color
#5BBFEF is a medium-light, moderately saturated blue. In OKLCH its lightness is 76%, its chroma 0.116 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.027 away. Black text reads best on it, at 10.14:1.
| Hue family | Blues |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 10.14:1 |
| White text | 2.07:1 |
Values
| HEX | #5BBFEF |
| RGB | rgb(91, 191, 239) |
| HSL | hsl(199, 82%, 65%) |
| OKLCH | oklch(76.4% 0.116 231.9) |
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 #5BBFEF | 2.07:1 | Fails | Lc -44.7 | Non-text elements, placeholder text |
| Black text on #5BBFEF | 10.14:1 | AAA | Lc 63.8 | Content text, not long reading |
| #5BBFEF text on white | 2.07:1 | Fails | Lc 40.2 | Non-text elements, placeholder text |
| #5BBFEF text on black | 10.14:1 | AAA | Lc -62.1 | 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
#ECF8FE
oklch(97.2% 0.015 229)
-
Step 100
100
#D5EEFD
oklch(93.5% 0.033 234.1)
-
Step 200
200
#AFE1FD
oklch(88.4% 0.064 233)
-
Step 300
300 (this color)
#5BBFEF
oklch(76.4% 0.116 231.9)
-
Step 400
400
#00AFEA
oklch(70.8% 0.144 231.6)
-
Step 500
500
#0096C9
oklch(63.2% 0.128 231.5)
-
Step 600
600
#007EAA
oklch(55.7% 0.113 231.8)
-
Step 700
700
#006A8F
oklch(49.2% 0.1 231.3)
-
Step 800
800
#005676
oklch(42.6% 0.087 232.3)
-
Step 900
900
#004863
oklch(37.7% 0.077 231.8)
-
Step 950
950
#002B3C
oklch(27.1% 0.054 230.4)
#5BBFEF 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) | #A7BDF1 | 0.077 |
| Deuteranopia (no green cones) | #93AEEE | 0.066 |
| Tritanopia (no blue cones) | #00CCCF | 0.076 |
| Achromatopsia (no color) | #B4B4B4 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5BBFEF
#5BBFEF
oklch(76.4% 0.116 231.9)
- #ED9D6B
#ED9D6B
oklch(76.5% 0.116 52.2)
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 #5BBFEF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.027
- Deep Sky Blue #00BFFF ΔE 0.039
- Lightblue #7BC8F6 ΔE 0.040
- Bright Sky Blue #02CCFE ΔE 0.042
- Sky #82CAFC ΔE 0.051
- Carolina Blue #8AB8FE ΔE 0.054
- Light Sky Blue #87CEFA ΔE 0.061
- Sky Blue #87CEEB ΔE 0.062
Use #5BBFEF 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.