#66ACE2
Closest named color: Deep Sky Blue (#00BFFF). oklch(72% 0.106 243.3), rgb(102, 172, 226).
Aa
Black text reads best on this color (8.56:1).
About this color
#66ACE2 is a medium-light, moderately saturated blue. In OKLCH its lightness is 72%, its chroma 0.106 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.064 away. Black text reads best on it, at 8.56:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.56:1 |
| White text | 2.45:1 |
Values
| HEX | #66ACE2 |
| RGB | rgb(102, 172, 226) |
| HSL | hsl(206, 68%, 64%) |
| OKLCH | oklch(72% 0.106 243.3) |
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 #66ACE2 | 2.45:1 | Fails | Lc -53.1 | Large or bold text, headings |
| Black text on #66ACE2 | 8.56:1 | AAA | Lc 55.9 | Large or bold text, headings |
| #66ACE2 text on white | 2.45:1 | Fails | Lc 48.1 | Large or bold text, headings |
| #66ACE2 text on black | 8.56:1 | AAA | Lc -53.9 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#DFECF6
oklch(93.6% 0.019 240.7)
-
Step 200
200
#C5DDF0
oklch(88.6% 0.037 241.8)
-
Step 300
300
#9CC6E9
oklch(80.9% 0.067 243.9)
-
Step 400
400 (this color)
#66ACE2
oklch(72% 0.106 243.3)
-
Step 500
500
#2C91D5
oklch(63.2% 0.136 243.4)
-
Step 600
600
#007ABB
oklch(55.7% 0.134 242.9)
-
Step 700
700
#00669E
oklch(49% 0.119 243.2)
-
Step 800
800
#005483
oklch(42.8% 0.104 243)
-
Step 900
900
#05456C
oklch(37.5% 0.088 243.4)
-
Step 950
950
#08293F
oklch(27% 0.055 242.5)
#66ACE2 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) | #95ACE5 | 0.053 |
| Deuteranopia (no green cones) | #84A0E1 | 0.042 |
| Tritanopia (no blue cones) | #00B9BE | 0.089 |
| Achromatopsia (no color) | #A5A5A5 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66ACE2
#66ACE2
oklch(72% 0.106 243.3)
- #D4965B
#D4965B
oklch(72.1% 0.106 63.4)
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 #66ACE2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.064
- Carolina Blue #8AB8FE ΔE 0.064
- Greyblue #77A1B5 ΔE 0.065
- Cornflower Blue #6495ED ΔE 0.069
- Bluegrey #85A3B2 ΔE 0.072
- Turquoise Blue #06B1C4 ΔE 0.073
- Bluey Grey #89A0B0 ΔE 0.076
- Vivid Sky Blue #4CC9F0 ΔE 0.076
Use #66ACE2 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.