#5BBFFF
Closest named color: Deep Sky Blue (#00BFFF). oklch(77.1% 0.131 239.7), rgb(91, 191, 255).
Aa
Black text reads best on this color (10.34:1).
About this color
#5BBFFF is a medium-light, moderately saturated blue. In OKLCH its lightness is 77%, its chroma 0.131 and its hue 240°. 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 10.34:1.
| Hue family | Blues |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 10.34:1 |
| White text | 2.03:1 |
Values
| HEX | #5BBFFF |
| RGB | rgb(91, 191, 255) |
| HSL | hsl(203, 100%, 68%) |
| OKLCH | oklch(77.1% 0.131 239.7) |
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 #5BBFFF | 2.03:1 | Fails | Lc -43.7 | Non-text elements, placeholder text |
| Black text on #5BBFFF | 10.34:1 | AAA | Lc 64.7 | Content text, not long reading |
| #5BBFFF text on white | 2.03:1 | Fails | Lc 39.2 | Non-text elements, placeholder text |
| #5BBFFF text on black | 10.34:1 | AAA | Lc -63.1 | 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
#EDF7FF
oklch(97.1% 0.015 241.8)
-
Step 100
100
#D6EEFF
oklch(93.7% 0.034 238.7)
-
Step 200
200
#B4E0FF
oklch(88.6% 0.063 239.1)
-
Step 300
300 (this color)
#5BBFFF
oklch(77.1% 0.131 239.7)
-
Step 400
400
#00ABF9
oklch(70.6% 0.161 239.7)
-
Step 500
500
#0093D6
oklch(63.1% 0.143 239.3)
-
Step 600
600
#007BB5
oklch(55.6% 0.127 239.8)
-
Step 700
700
#006799
oklch(49% 0.112 240)
-
Step 800
800
#00557E
oklch(42.8% 0.097 239.2)
-
Step 900
900
#00466A
oklch(37.6% 0.086 240.1)
-
Step 950
950
#002A41
oklch(27.1% 0.061 239)
#5BBFFF 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) | #A2BFFF | 0.070 |
| Deuteranopia (no green cones) | #8BAFFE | 0.057 |
| Tritanopia (no blue cones) | #00CFD5 | 0.093 |
| Achromatopsia (no color) | #B6B6B6 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5BBFFF
#5BBFFF
oklch(77.1% 0.131 239.7)
- #F19F58
#F19F58
oklch(77.1% 0.131 59.8)
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 #5BBFFF, 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 0.041
- Lightblue #7BC8F6 ΔE 0.043
- Bright Sky Blue #02CCFE ΔE 0.044
- Carolina Blue #8AB8FE ΔE 0.044
- Sky #82CAFC ΔE 0.049
- Light Sky Blue #87CEFA ΔE 0.062
- Sky Blue #87CEEB ΔE 0.070
Use #5BBFFF 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.