#5BBBEB
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(75.3% 0.114 232.8), rgb(91, 187, 235).
Aa
Black text reads best on this color (9.75:1).
About this color
#5BBBEB is a medium-light, moderately saturated blue. In OKLCH its lightness is 75%, its chroma 0.114 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.037 away. Black text reads best on it, at 9.75:1.
| Hue family | Blues |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.75:1 |
| White text | 2.15:1 |
Values
| HEX | #5BBBEB |
| RGB | rgb(91, 187, 235) |
| HSL | hsl(200, 78%, 64%) |
| OKLCH | oklch(75.3% 0.114 232.8) |
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 #5BBBEB | 2.15:1 | Fails | Lc -46.7 | Large or bold text, headings |
| Black text on #5BBBEB | 9.75:1 | AAA | Lc 61.9 | Content text, not long reading |
| #5BBBEB text on white | 2.15:1 | Fails | Lc 42.1 | Non-text elements, placeholder text |
| #5BBBEB text on black | 9.75:1 | AAA | Lc -60.2 | 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 400.
-
Step 50
50
#F0F7FB
oklch(97.2% 0.009 232.4)
-
Step 100
100
#DDEDF6
oklch(93.7% 0.021 232.1)
-
Step 200
200
#C0DEEF
oklch(88.4% 0.04 232.7)
-
Step 300
300
#92C9E7
oklch(80.8% 0.071 232.6)
-
Step 400
400 (this color)
#5BBBEB
oklch(75.3% 0.114 232.8)
-
Step 500
500
#0095CB
oklch(63% 0.131 233.2)
-
Step 600
600
#007DAB
oklch(55.5% 0.115 233.2)
-
Step 700
700
#006990
oklch(49% 0.101 232.9)
-
Step 800
800
#005677
oklch(42.6% 0.088 233.1)
-
Step 900
900
#004864
oklch(37.8% 0.078 232.8)
-
Step 950
950
#002B3D
oklch(27.1% 0.055 231.9)
#5BBBEB 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) | #A4B9ED | 0.075 |
| Deuteranopia (no green cones) | #8FAAEA | 0.064 |
| Tritanopia (no blue cones) | #00C8CB | 0.076 |
| Achromatopsia (no color) | #B1B1B1 | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5BBBEB
#5BBBEB
oklch(75.3% 0.114 232.8)
- #E89A68
#E89A68
oklch(75.3% 0.114 52.8)
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 #5BBBEB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.037
- Deep Sky Blue #00BFFF ΔE 0.040
- Lightblue #7BC8F6 ΔE 0.049
- Bright Sky Blue #02CCFE ΔE 0.051
- Carolina Blue #8AB8FE ΔE 0.056
- Sky #82CAFC ΔE 0.060
- Light Cornflower Blue #98C1D9 ΔE 0.069
- Sky Blue #87CEEB ΔE 0.070
Use #5BBBEB 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.