#5BB9E4
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(74.6% 0.108 230.4), rgb(91, 185, 228).
Aa
Black text reads best on this color (9.50:1).
About this color
#5BB9E4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 75%, its chroma 0.108 and its hue 230°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.042 away. Black text reads best on it, at 9.50:1.
| Hue family | Blues |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.50:1 |
| White text | 2.20:1 |
Values
| HEX | #5BB9E4 |
| RGB | rgb(91, 185, 228) |
| HSL | hsl(199, 72%, 63%) |
| OKLCH | oklch(74.6% 0.108 230.4) |
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 #5BB9E4 | 2.20:1 | Fails | Lc -48.0 | Large or bold text, headings |
| Black text on #5BB9E4 | 9.50:1 | AAA | Lc 60.7 | Content text, not long reading |
| #5BB9E4 text on white | 2.20:1 | Fails | Lc 43.3 | Non-text elements, placeholder text |
| #5BB9E4 text on black | 9.50:1 | AAA | Lc -58.9 | Large or bold text, headings |
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
#F0F7FA
oklch(97.2% 0.008 225.1)
-
Step 100
100
#DDEDF5
oklch(93.7% 0.02 229)
-
Step 200
200
#C1DEEE
oklch(88.4% 0.038 232)
-
Step 300
300
#94C9E4
oklch(80.8% 0.067 230.7)
-
Step 400
400 (this color)
#5BB9E4
oklch(74.6% 0.108 230.4)
-
Step 500
500
#0096C7
oklch(63.1% 0.126 230.5)
-
Step 600
600
#007EA8
oklch(55.6% 0.112 230.6)
-
Step 700
700
#006A8E
oklch(49.1% 0.099 230.6)
-
Step 800
800
#005775
oklch(42.8% 0.086 230.3)
-
Step 900
900
#004862
oklch(37.7% 0.076 230.8)
-
Step 950
950
#002B3C
oklch(27.1% 0.054 230.4)
#5BB9E4 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) | #A3B6E6 | 0.075 |
| Deuteranopia (no green cones) | #90A8E3 | 0.066 |
| Tritanopia (no blue cones) | #00C5C7 | 0.072 |
| Achromatopsia (no color) | #AEAEAE | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5BB9E4
#5BB9E4
oklch(74.6% 0.108 230.4)
- #E4986C
#E4986C
oklch(74.6% 0.109 50.5)
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 #5BB9E4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.042
- Deep Sky Blue #00BFFF ΔE 0.046
- Lightblue #7BC8F6 ΔE 0.056
- Bright Sky Blue #02CCFE ΔE 0.057
- Carolina Blue #8AB8FE ΔE 0.062
- Turquoise Blue #06B1C4 ΔE 0.067
- Sky #82CAFC ΔE 0.067
- Light Cornflower Blue #98C1D9 ΔE 0.069
Use #5BB9E4 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.