#5BBFF9
Closest named color: Deep Sky Blue (#00BFFF). oklch(76.8% 0.125 237), rgb(91, 191, 249).
Aa
Black text reads best on this color (10.26:1).
About this color
#5BBFF9 is a medium-light, moderately saturated blue. In OKLCH its lightness is 77%, its chroma 0.125 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.034 away. Black text reads best on it, at 10.26:1.
| Hue family | Blues |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 10.26:1 |
| White text | 2.04:1 |
Values
| HEX | #5BBFF9 |
| RGB | rgb(91, 191, 249) |
| HSL | hsl(202, 93%, 67%) |
| OKLCH | oklch(76.8% 0.125 237) |
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 #5BBFF9 | 2.04:1 | Fails | Lc -44.1 | Non-text elements, placeholder text |
| Black text on #5BBFF9 | 10.26:1 | AAA | Lc 64.3 | Content text, not long reading |
| #5BBFF9 text on white | 2.04:1 | Fails | Lc 39.6 | Non-text elements, placeholder text |
| #5BBFF9 text on black | 10.26:1 | AAA | Lc -62.7 | 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
#ECF7FF
oklch(97% 0.016 239.1)
-
Step 100
100
#D5EEFF
oklch(93.6% 0.035 237.5)
-
Step 200
200
#B1E0FF
oklch(88.4% 0.065 237.4)
-
Step 300
300 (this color)
#5BBFF9
oklch(76.8% 0.125 237)
-
Step 400
400
#00ADF4
oklch(70.8% 0.154 236.9)
-
Step 500
500
#0094D2
oklch(63.2% 0.138 237.1)
-
Step 600
600
#007CB1
oklch(55.6% 0.122 237.2)
-
Step 700
700
#006895
oklch(49% 0.107 237)
-
Step 800
800
#00557B
oklch(42.6% 0.093 237.2)
-
Step 900
900
#004767
oklch(37.7% 0.082 236.6)
-
Step 950
950
#002A3F
oklch(27% 0.059 236.5)
#5BBFF9 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) | #A4BEFC | 0.074 |
| Deuteranopia (no green cones) | #8EAEF8 | 0.062 |
| Tritanopia (no blue cones) | #00CED3 | 0.086 |
| Achromatopsia (no color) | #B5B5B5 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5BBFF9
#5BBFF9
oklch(76.8% 0.125 237)
- #EF9E60
#EF9E60
oklch(76.8% 0.124 57)
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 #5BBFF9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.034
- Vivid Sky Blue #4CC9F0 ΔE 0.034
- Lightblue #7BC8F6 ΔE 0.040
- Bright Sky Blue #02CCFE ΔE 0.042
- Carolina Blue #8AB8FE ΔE 0.047
- Sky #82CAFC ΔE 0.049
- Light Sky Blue #87CEFA ΔE 0.060
- Sky Blue #87CEEB ΔE 0.066
Use #5BBFF9 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.