#5BB4FC
Closest named color: Deep Sky Blue (#00BFFF). oklch(74.5% 0.135 245.5), rgb(91, 180, 252).
Aa
Black text reads best on this color (9.37:1).
About this color
#5BB4FC is a medium-light, moderately saturated blue. In OKLCH its lightness is 75%, its chroma 0.135 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.040 away. Black text reads best on it, at 9.37:1.
| Hue family | Blues |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.37:1 |
| White text | 2.23:1 |
Values
| HEX | #5BB4FC |
| RGB | rgb(91, 180, 252) |
| HSL | hsl(207, 96%, 67%) |
| OKLCH | oklch(74.5% 0.135 245.5) |
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 #5BB4FC | 2.23:1 | Fails | Lc -48.7 | Large or bold text, headings |
| Black text on #5BB4FC | 9.37:1 | AAA | Lc 60.1 | Content text, not long reading |
| #5BB4FC text on white | 2.23:1 | Fails | Lc 43.9 | Non-text elements, placeholder text |
| #5BB4FC text on black | 9.37:1 | AAA | Lc -58.3 | 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
#EFF6FD
oklch(97% 0.012 248)
-
Step 100
100
#DDECFA
oklch(93.6% 0.025 246.2)
-
Step 200
200
#C0DDF7
oklch(88.5% 0.047 245.4)
-
Step 300
300
#93C7F4
oklch(81% 0.084 245.2)
-
Step 400
400 (this color)
#5BB4FC
oklch(74.5% 0.135 245.5)
-
Step 500
500
#0090E3
oklch(63.2% 0.16 245.3)
-
Step 600
600
#0079C0
oklch(55.7% 0.141 245.3)
-
Step 700
700
#0065A2
oklch(49% 0.125 245.5)
-
Step 800
800
#005386
oklch(42.8% 0.108 245.3)
-
Step 900
900
#004571
oklch(37.8% 0.096 245.5)
-
Step 950
950
#002945
oklch(27.1% 0.068 244.5)
#5BB4FC 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) | #94B6FF | 0.058 |
| Deuteranopia (no green cones) | #7EA6FB | 0.046 |
| Tritanopia (no blue cones) | #00C5CD | 0.102 |
| Achromatopsia (no color) | #ADADAD | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5BB4FC
#5BB4FC
oklch(74.5% 0.135 245.5)
- #E69944
#E69944
oklch(74.5% 0.135 65.4)
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 #5BB4FC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.040
- Carolina Blue #8AB8FE ΔE 0.048
- Vivid Sky Blue #4CC9F0 ΔE 0.065
- Bright Sky Blue #02CCFE ΔE 0.067
- Lightblue #7BC8F6 ΔE 0.067
- Sky #82CAFC ΔE 0.074
- Cornflower Blue #6495ED ΔE 0.081
- Pastel Blue #A2BFFE ΔE 0.083
Use #5BB4FC 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.