#5BB4EF
Closest named color: Deep Sky Blue (#00BFFF). oklch(73.9% 0.121 240.2), rgb(91, 180, 239).
Aa
Black text reads best on this color (9.21:1).
About this color
#5BB4EF is a medium-light, moderately saturated blue. In OKLCH its lightness is 74%, its chroma 0.121 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.042 away. Black text reads best on it, at 9.21:1.
| Hue family | Blues |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.21:1 |
| White text | 2.27:1 |
Values
| HEX | #5BB4EF |
| RGB | rgb(91, 180, 239) |
| HSL | hsl(204, 82%, 65%) |
| OKLCH | oklch(73.9% 0.121 240.2) |
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 #5BB4EF | 2.27:1 | Fails | Lc -49.5 | Large or bold text, headings |
| Black text on #5BB4EF | 9.21:1 | AAA | Lc 59.3 | Large or bold text, headings |
| #5BB4EF text on white | 2.27:1 | Fails | Lc 44.7 | Non-text elements, placeholder text |
| #5BB4EF text on black | 9.21:1 | AAA | Lc -57.4 | 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
#F0F7FC
oklch(97.2% 0.01 238.5)
-
Step 100
100
#DDECF7
oklch(93.5% 0.022 239.4)
-
Step 200
200
#C1DEF3
oklch(88.6% 0.042 239.5)
-
Step 300
300
#94C8ED
oklch(81% 0.075 239.8)
-
Step 400
400 (this color)
#5BB4EF
oklch(73.9% 0.121 240.2)
-
Step 500
500
#0092D8
oklch(63% 0.146 240.6)
-
Step 600
600
#007BB6
oklch(55.6% 0.128 240.2)
-
Step 700
700
#00679A
oklch(49.1% 0.113 240.5)
-
Step 800
800
#00547F
oklch(42.6% 0.099 240.7)
-
Step 900
900
#00466B
oklch(37.7% 0.087 240.8)
-
Step 950
950
#002A41
oklch(27.1% 0.061 239)
#5BB4EF 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) | #99B4F2 | 0.064 |
| Deuteranopia (no green cones) | #85A5EE | 0.053 |
| Tritanopia (no blue cones) | #00C3C8 | 0.089 |
| Achromatopsia (no color) | #ACACAC | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5BB4EF
#5BB4EF
oklch(73.9% 0.121 240.2)
- #E29757
#E29757
oklch(73.9% 0.121 59.7)
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 #5BB4EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.042
- Carolina Blue #8AB8FE ΔE 0.054
- Vivid Sky Blue #4CC9F0 ΔE 0.057
- Lightblue #7BC8F6 ΔE 0.065
- Bright Sky Blue #02CCFE ΔE 0.065
- Sky #82CAFC ΔE 0.074
- Turquoise Blue #06B1C4 ΔE 0.079
- Cornflower Blue #6495ED ΔE 0.083
Use #5BB4EF 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.