#66AAEE
Closest named color: Cornflower Blue (#6495ED). oklch(72.1% 0.122 249.8), rgb(102, 170, 238).
Aa
Black text reads best on this color (8.54:1).
About this color
#66AAEE is a medium-light, moderately saturated blue. In OKLCH its lightness is 72%, its chroma 0.122 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.057 away. Black text reads best on it, at 8.54:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 8.54:1 |
| White text | 2.45:1 |
Values
| HEX | #66AAEE |
| RGB | rgb(102, 170, 238) |
| HSL | hsl(210, 80%, 67%) |
| OKLCH | oklch(72.1% 0.122 249.8) |
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 #66AAEE | 2.45:1 | Fails | Lc -53.1 | Large or bold text, headings |
| Black text on #66AAEE | 8.54:1 | AAA | Lc 55.9 | Large or bold text, headings |
| #66AAEE text on white | 2.45:1 | Fails | Lc 48.1 | Large or bold text, headings |
| #66AAEE text on black | 8.54:1 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFEBF8
oklch(93.5% 0.022 250.2)
-
Step 200
200
#C5DCF5
oklch(88.5% 0.042 250.5)
-
Step 300
300
#9BC5F0
oklch(80.9% 0.076 249.4)
-
Step 400
400 (this color)
#66AAEE
oklch(72.1% 0.122 249.8)
-
Step 500
500
#2D8DE3
oklch(63.1% 0.156 250)
-
Step 600
600
#0076CA
oklch(55.7% 0.156 249.7)
-
Step 700
700
#0063AB
oklch(49.2% 0.138 249.7)
-
Step 800
800
#00518D
oklch(42.7% 0.12 249.5)
-
Step 900
900
#074375
oklch(37.7% 0.102 250.3)
-
Step 950
950
#082844
oklch(27% 0.064 249)
#66AAEE 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) | #8DADF1 | 0.044 |
| Deuteranopia (no green cones) | #7C9FED | 0.034 |
| Tritanopia (no blue cones) | #00BAC2 | 0.102 |
| Achromatopsia (no color) | #A5A5A5 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66AAEE
#66AAEE
oklch(72.1% 0.122 249.8)
- #D59647
#D59647
oklch(72% 0.121 69.8)
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 #66AAEE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.057
- Carolina Blue #8AB8FE ΔE 0.059
- Deep Sky Blue #00BFFF ΔE 0.064
- Periwinkle Blue #8F99FB ΔE 0.067
- Chefchaouen Blue #4895EF ΔE 0.067
- Greyblue #77A1B5 ΔE 0.082
- Vivid Sky Blue #4CC9F0 ΔE 0.084
- Perrywinkle #8F8CE7 ΔE 0.085
Use #66AAEE 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.