#55B3FB
Closest named color: Deep Sky Blue (#00BFFF). oklch(74% 0.137 244.4), rgb(85, 179, 251).
Aa
Black text reads best on this color (9.22:1).
About this color
#55B3FB is a medium-light, moderately saturated blue. In OKLCH its lightness is 74%, its chroma 0.137 and its hue 244°. 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 9.22:1.
| Hue family | Blues |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.22:1 |
| White text | 2.27:1 |
Values
| HEX | #55B3FB |
| RGB | rgb(85, 179, 251) |
| HSL | hsl(206, 95%, 66%) |
| OKLCH | oklch(74% 0.137 244.4) |
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 #55B3FB | 2.27:1 | Fails | Lc -49.4 | Large or bold text, headings |
| Black text on #55B3FB | 9.22:1 | AAA | Lc 59.4 | Large or bold text, headings |
| #55B3FB text on white | 2.27:1 | Fails | Lc 44.6 | Non-text elements, placeholder text |
| #55B3FB text on black | 9.22:1 | AAA | Lc -57.5 | 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
#91C7F5
oklch(80.9% 0.086 244.9)
-
Step 400
400 (this color)
#55B3FB
oklch(74% 0.137 244.4)
-
Step 500
500
#0090E1
oklch(63.1% 0.158 244.7)
-
Step 600
600
#0079BE
oklch(55.6% 0.139 244.6)
-
Step 700
700
#0066A0
oklch(49.2% 0.121 244)
-
Step 800
800
#005384
oklch(42.6% 0.106 244.3)
-
Step 900
900
#00456F
oklch(37.6% 0.093 244.3)
-
Step 950
950
#002945
oklch(27.1% 0.068 244.5)
#55B3FB 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) | #93B5FE | 0.062 |
| Deuteranopia (no green cones) | #7CA5FA | 0.047 |
| Tritanopia (no blue cones) | #00C4CC | 0.100 |
| Achromatopsia (no color) | #ACACAC | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #55B3FB
#55B3FB
oklch(74% 0.137 244.4)
- #E69741
#E69741
oklch(74.1% 0.137 64.8)
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 #55B3FB, 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
- Carolina Blue #8AB8FE ΔE 0.054
- Vivid Sky Blue #4CC9F0 ΔE 0.067
- Bright Sky Blue #02CCFE ΔE 0.068
- Lightblue #7BC8F6 ΔE 0.072
- Cornflower Blue #6495ED ΔE 0.078
- Sky #82CAFC ΔE 0.079
- Chefchaouen Blue #4895EF ΔE 0.083
Use #55B3FB 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.