#55ACE9
Closest named color: Deep Sky Blue (#00BFFF). oklch(71.6% 0.122 241.8), rgb(85, 172, 233).
Aa
Black text reads best on this color (8.46:1).
About this color
#55ACE9 is a medium-light, moderately saturated blue. In OKLCH its lightness is 72%, its chroma 0.122 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.056 away. Black text reads best on it, at 8.46:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.46:1 |
| White text | 2.48:1 |
Values
| HEX | #55ACE9 |
| RGB | rgb(85, 172, 233) |
| HSL | hsl(205, 77%, 62%) |
| OKLCH | oklch(71.6% 0.122 241.8) |
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 #55ACE9 | 2.48:1 | Fails | Lc -53.5 | Large or bold text, headings |
| Black text on #55ACE9 | 8.46:1 | AAA | Lc 55.5 | Large or bold text, headings |
| #55ACE9 text on white | 2.48:1 | Fails | Lc 48.5 | Large or bold text, headings |
| #55ACE9 text on black | 8.46:1 | AAA | Lc -53.5 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DEECF8
oklch(93.6% 0.022 243.8)
-
Step 200
200
#C1DDF3
oklch(88.4% 0.043 241.7)
-
Step 300
300
#95C7EE
oklch(80.8% 0.076 242.3)
-
Step 400
400 (this color)
#55ACE9
oklch(71.6% 0.122 241.8)
-
Step 500
500
#0092DB
oklch(63.2% 0.149 241.7)
-
Step 600
600
#007AB9
oklch(55.5% 0.132 242.1)
-
Step 700
700
#00679C
oklch(49.2% 0.116 241.5)
-
Step 800
800
#005481
oklch(42.7% 0.101 241.9)
-
Step 900
900
#00466C
oklch(37.7% 0.089 241.5)
-
Step 950
950
#002943
oklch(27% 0.065 242.6)
#55ACE9 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) | #91ADEC | 0.062 |
| Deuteranopia (no green cones) | #7C9EE8 | 0.049 |
| Tritanopia (no blue cones) | #00BBC1 | 0.090 |
| Achromatopsia (no color) | #A4A4A4 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #55ACE9
#55ACE9
oklch(71.6% 0.122 241.8)
- #DA914C
#DA914C
oklch(71.7% 0.123 62.1)
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 #55ACE9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.056
- Cornflower Blue #6495ED ΔE 0.064
- Chefchaouen Blue #4895EF ΔE 0.068
- Carolina Blue #8AB8FE ΔE 0.071
- Turquoise Blue #06B1C4 ΔE 0.072
- Greyblue #77A1B5 ΔE 0.077
- Vivid Sky Blue #4CC9F0 ΔE 0.078
- Periwinkle Blue #8F99FB ΔE 0.084
Use #55ACE9 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.