#55B4FC
Closest named color: Deep Sky Blue (#00BFFF). oklch(74.3% 0.138 244.2), rgb(85, 180, 252).
Aa
Black text reads best on this color (9.32:1).
About this color
#55B4FC is a medium-light, moderately saturated blue. In OKLCH its lightness is 74%, its chroma 0.138 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.037 away. Black text reads best on it, at 9.32:1.
| Hue family | Blues |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.32:1 |
| White text | 2.25:1 |
Values
| HEX | #55B4FC |
| RGB | rgb(85, 180, 252) |
| HSL | hsl(206, 97%, 66%) |
| OKLCH | oklch(74.3% 0.138 244.2) |
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 #55B4FC | 2.25:1 | Fails | Lc -48.9 | Large or bold text, headings |
| Black text on #55B4FC | 9.32:1 | AAA | Lc 59.8 | Large or bold text, headings |
| #55B4FC text on white | 2.25:1 | Fails | Lc 44.1 | Non-text elements, placeholder text |
| #55B4FC text on black | 9.32:1 | AAA | Lc -58.0 | 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
#BFDDF7
oklch(88.4% 0.048 244.5)
-
Step 300
300
#91C7F5
oklch(80.9% 0.086 244.9)
-
Step 400
400 (this color)
#55B4FC
oklch(74.3% 0.138 244.2)
-
Step 500
500
#0090E0
oklch(63% 0.157 244.4)
-
Step 600
600
#0079BD
oklch(55.5% 0.138 244.2)
-
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
#002944
oklch(27% 0.066 243.6)
#55B4FC 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 | 0.063 |
| Deuteranopia (no green cones) | #7DA5FB | 0.050 |
| Tritanopia (no blue cones) | #00C5CD | 0.100 |
| Achromatopsia (no color) | #ADADAD | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #55B4FC
#55B4FC
oklch(74.3% 0.138 244.2)
- #E79742
#E79742
oklch(74.2% 0.138 64.2)
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 #55B4FC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.037
- Carolina Blue #8AB8FE ΔE 0.053
- Vivid Sky Blue #4CC9F0 ΔE 0.065
- Bright Sky Blue #02CCFE ΔE 0.066
- Lightblue #7BC8F6 ΔE 0.070
- Sky #82CAFC ΔE 0.077
- Cornflower Blue #6495ED ΔE 0.080
- Chefchaouen Blue #4895EF ΔE 0.085
Use #55B4FC 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.