#5BB9EC
Closest named color: Deep Sky Blue (#00BFFF). oklch(74.9% 0.115 235), rgb(91, 185, 236).
Aa
Black text reads best on this color (9.59:1).
About this color
#5BB9EC is a medium-light, moderately saturated blue. In OKLCH its lightness is 75%, its chroma 0.115 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.039 away. Black text reads best on it, at 9.59:1.
| Hue family | Blues |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.59:1 |
| White text | 2.18:1 |
Values
| HEX | #5BB9EC |
| RGB | rgb(91, 185, 236) |
| HSL | hsl(201, 79%, 64%) |
| OKLCH | oklch(74.9% 0.115 235) |
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 #5BB9EC | 2.18:1 | Fails | Lc -47.5 | Large or bold text, headings |
| Black text on #5BB9EC | 9.59:1 | AAA | Lc 61.1 | Content text, not long reading |
| #5BB9EC text on white | 2.18:1 | Fails | Lc 42.8 | Non-text elements, placeholder text |
| #5BB9EC text on black | 9.59:1 | AAA | Lc -59.4 | 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
#F0F7FB
oklch(97.2% 0.009 232.4)
-
Step 100
100
#DDECF6
oklch(93.5% 0.021 236.8)
-
Step 200
200
#C1DEF0
oklch(88.5% 0.04 235.2)
-
Step 300
300
#93C9E9
oklch(81% 0.072 234.8)
-
Step 400
400 (this color)
#5BB9EC
oklch(74.9% 0.115 235)
-
Step 500
500
#0095CE
oklch(63.2% 0.133 234.7)
-
Step 600
600
#007DAE
oklch(55.7% 0.118 234.9)
-
Step 700
700
#006993
oklch(49.2% 0.104 234.9)
-
Step 800
800
#005679
oklch(42.8% 0.09 234.7)
-
Step 900
900
#004766
oklch(37.6% 0.081 235.8)
-
Step 950
950
#002A3E
oklch(26.9% 0.057 235.2)
#5BB9EC 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) | #A1B8EE | 0.072 |
| Deuteranopia (no green cones) | #8DA9EB | 0.061 |
| Tritanopia (no blue cones) | #00C6CA | 0.079 |
| Achromatopsia (no color) | #AFAFAF | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5BB9EC
#5BB9EC
oklch(74.9% 0.115 235)
- #E69964
#E69964
oklch(74.9% 0.115 54.5)
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 #5BB9EC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.039
- Vivid Sky Blue #4CC9F0 ΔE 0.043
- Lightblue #7BC8F6 ΔE 0.053
- Bright Sky Blue #02CCFE ΔE 0.054
- Carolina Blue #8AB8FE ΔE 0.055
- Sky #82CAFC ΔE 0.064
- Light Cornflower Blue #98C1D9 ΔE 0.072
- Light Sky Blue #87CEFA ΔE 0.075
Use #5BB9EC 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.