#55ACE4
Closest named color: Deep Sky Blue (#00BFFF). oklch(71.4% 0.117 239.5), rgb(85, 172, 228).
Aa
Black text reads best on this color (8.40:1).
About this color
#55ACE4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 71%, its chroma 0.117 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.058 away. Black text reads best on it, at 8.40:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.40:1 |
| White text | 2.49:1 |
Values
| HEX | #55ACE4 |
| RGB | rgb(85, 172, 228) |
| HSL | hsl(203, 73%, 61%) |
| OKLCH | oklch(71.4% 0.117 239.5) |
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 #55ACE4 | 2.49:1 | Fails | Lc -53.9 | Large or bold text, headings |
| Black text on #55ACE4 | 8.40:1 | AAA | Lc 55.2 | Large or bold text, headings |
| #55ACE4 text on white | 2.49:1 | Fails | Lc 48.8 | Large or bold text, headings |
| #55ACE4 text on black | 8.40:1 | AAA | Lc -53.2 | 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
#F0F6FB
oklch(97% 0.009 242.8)
-
Step 100
100
#DEECF7
oklch(93.6% 0.021 241.4)
-
Step 200
200
#C2DDF2
oklch(88.4% 0.041 241.4)
-
Step 300
300
#95C8EB
oklch(80.9% 0.073 238.8)
-
Step 400
400 (this color)
#55ACE4
oklch(71.4% 0.117 239.5)
-
Step 500
500
#0093D6
oklch(63.1% 0.143 239.3)
-
Step 600
600
#007BB5
oklch(55.6% 0.127 239.8)
-
Step 700
700
#006799
oklch(49% 0.112 240)
-
Step 800
800
#00557E
oklch(42.8% 0.097 239.2)
-
Step 900
900
#00466A
oklch(37.6% 0.086 240.1)
-
Step 950
950
#002A41
oklch(27.1% 0.061 239)
#55ACE4 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) | #92ACE7 | 0.063 |
| Deuteranopia (no green cones) | #7F9EE3 | 0.052 |
| Tritanopia (no blue cones) | #00BABF | 0.084 |
| Achromatopsia (no color) | #A4A4A4 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #55ACE4
#55ACE4
oklch(71.4% 0.117 239.5)
- #D89053
#D89053
oklch(71.4% 0.117 59.6)
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 #55ACE4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.058
- Turquoise Blue #06B1C4 ΔE 0.066
- Cornflower Blue #6495ED ΔE 0.067
- Greyblue #77A1B5 ΔE 0.071
- Chefchaouen Blue #4895EF ΔE 0.071
- Carolina Blue #8AB8FE ΔE 0.074
- Vivid Sky Blue #4CC9F0 ΔE 0.077
- Bluegrey #85A3B2 ΔE 0.080
Use #55ACE4 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.