#66AFFE
Closest named color: Carolina Blue (#8AB8FE). oklch(74% 0.137 251.8), rgb(102, 175, 254).
Aa
Black text reads best on this color (9.12:1).
About this color
#66AFFE is a medium-light, moderately saturated blue. In OKLCH its lightness is 74%, its chroma 0.137 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Carolina Blue (#8AB8FE), ΔE 0.047 away. Black text reads best on it, at 9.12:1.
| Hue family | Blues |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Carolina Blue (#8AB8FE) |
| Black text | 9.12:1 |
| White text | 2.30:1 |
Values
| HEX | #66AFFE |
| RGB | rgb(102, 175, 254) |
| HSL | hsl(211, 99%, 70%) |
| OKLCH | oklch(74% 0.137 251.8) |
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 #66AFFE | 2.30:1 | Fails | Lc -50.0 | Large or bold text, headings |
| Black text on #66AFFE | 9.12:1 | AAA | Lc 58.8 | Large or bold text, headings |
| #66AFFE text on white | 2.30:1 | Fails | Lc 45.2 | Large or bold text, headings |
| #66AFFE text on black | 9.12:1 | AAA | Lc -56.9 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DEEBFA
oklch(93.5% 0.025 251.9)
-
Step 200
200
#C3DCF8
oklch(88.5% 0.047 251.3)
-
Step 300
300
#98C5F7
oklch(81% 0.086 251.5)
-
Step 400
400 (this color)
#66AFFE
oklch(74% 0.137 251.8)
-
Step 500
500
#208BEE
oklch(63.1% 0.174 251.9)
-
Step 600
600
#0074D0
oklch(55.6% 0.166 251.9)
-
Step 700
700
#0061B0
oklch(49% 0.147 252)
-
Step 800
800
#005091
oklch(42.8% 0.126 251.5)
-
Step 900
900
#00427A
oklch(37.7% 0.112 251.7)
-
Step 950
950
#052748
oklch(27% 0.072 251.7)
#66AFFE 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) | #8DB3FF | 0.043 |
| Deuteranopia (no green cones) | #79A4FC | 0.032 |
| Tritanopia (no blue cones) | #00C1CB | 0.112 |
| Achromatopsia (no color) | #ABABAB | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66AFFE
#66AFFE
oklch(74% 0.137 251.8)
- #DF9B39
#DF9B39
oklch(73.9% 0.136 72.1)
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 #66AFFE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Carolina Blue #8AB8FE ΔE 0.047
- Deep Sky Blue #00BFFF ΔE 0.056
- Periwinkle Blue #8F99FB ΔE 0.067
- Cornflower Blue #6495ED ΔE 0.069
- Lightblue #7BC8F6 ΔE 0.077
- Chefchaouen Blue #4895EF ΔE 0.079
- Vivid Sky Blue #4CC9F0 ΔE 0.079
- Sky #82CAFC ΔE 0.082
Use #66AFFE 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.