#5BBBEC
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(75.4% 0.115 233.4), rgb(91, 187, 236).
Aa
Black text reads best on this color (9.76:1).
About this color
#5BBBEC is a medium-light, moderately saturated blue. In OKLCH its lightness is 75%, its chroma 0.115 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 9.76:1.
| Hue family | Blues |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.76:1 |
| White text | 2.15:1 |
Values
| HEX | #5BBBEC |
| RGB | rgb(91, 187, 236) |
| HSL | hsl(200, 79%, 64%) |
| OKLCH | oklch(75.4% 0.115 233.4) |
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 #5BBBEC | 2.15:1 | Fails | Lc -46.7 | Large or bold text, headings |
| Black text on #5BBBEC | 9.76:1 | AAA | Lc 61.9 | Content text, not long reading |
| #5BBBEC text on white | 2.15:1 | Fails | Lc 42.0 | Non-text elements, placeholder text |
| #5BBBEC text on black | 9.76:1 | 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
#EFF7FB
oklch(97.1% 0.01 228.9)
-
Step 100
100
#DDEDF6
oklch(93.7% 0.021 232.1)
-
Step 200
200
#C0DEF0
oklch(88.4% 0.04 234.3)
-
Step 300
300
#92C9E8
oklch(80.9% 0.072 233.5)
-
Step 400
400 (this color)
#5BBBEC
oklch(75.4% 0.115 233.4)
-
Step 500
500
#0095CC
oklch(63.1% 0.132 233.7)
-
Step 600
600
#007DAC
oklch(55.5% 0.116 233.8)
-
Step 700
700
#006991
oklch(49% 0.102 233.6)
-
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
#002A3D
oklch(26.9% 0.056 233.8)
#5BBBEC 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) | #A3B9EE | 0.074 |
| Deuteranopia (no green cones) | #8FAAEB | 0.064 |
| Tritanopia (no blue cones) | #00C8CB | 0.078 |
| Achromatopsia (no color) | #B1B1B1 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5BBBEC
#5BBBEC
oklch(75.4% 0.115 233.4)
- #E89A67
#E89A67
oklch(75.3% 0.115 53.3)
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 #5BBBEC, 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 0.039
- Lightblue #7BC8F6 ΔE 0.049
- Bright Sky Blue #02CCFE ΔE 0.050
- Carolina Blue #8AB8FE ΔE 0.055
- Sky #82CAFC ΔE 0.060
- Light Cornflower Blue #98C1D9 ΔE 0.069
- Light Sky Blue #87CEFA ΔE 0.070
Use #5BBBEC 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.