#66AAFA
Closest named color: Cornflower Blue (#6495ED). oklch(72.7% 0.136 253.6), rgb(102, 170, 250).
Aa
Black text reads best on this color (8.69:1).
About this color
#66AAFA is a medium-light, moderately saturated blue. In OKLCH its lightness is 73%, its chroma 0.136 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.056 away. Black text reads best on it, at 8.69:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 8.69:1 |
| White text | 2.41:1 |
Values
| HEX | #66AAFA |
| RGB | rgb(102, 170, 250) |
| HSL | hsl(212, 94%, 69%) |
| OKLCH | oklch(72.7% 0.136 253.6) |
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 #66AAFA | 2.41:1 | Fails | Lc -52.3 | Large or bold text, headings |
| Black text on #66AAFA | 8.69:1 | AAA | Lc 56.6 | Large or bold text, headings |
| #66AAFA text on white | 2.41:1 | Fails | Lc 47.4 | Large or bold text, headings |
| #66AAFA text on black | 8.69:1 | AAA | Lc -54.7 | 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
#DFEBFA
oklch(93.6% 0.024 254)
-
Step 200
200
#C4DCF8
oklch(88.6% 0.047 252.4)
-
Step 300
300
#9AC4F7
oklch(80.9% 0.085 253.6)
-
Step 400
400 (this color)
#66AAFA
oklch(72.7% 0.136 253.6)
-
Step 500
500
#2B8AEF
oklch(63.1% 0.174 253.6)
-
Step 600
600
#0072D5
oklch(55.5% 0.175 253.6)
-
Step 700
700
#0060B5
oklch(49.2% 0.155 253.6)
-
Step 800
800
#004E95
oklch(42.6% 0.134 253.6)
-
Step 900
900
#06417B
oklch(37.6% 0.113 253.7)
-
Step 950
950
#082748
oklch(27.1% 0.071 253.2)
#66AAFA 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) | #88AFFD | 0.040 |
| Deuteranopia (no green cones) | #75A0F8 | 0.028 |
| Tritanopia (no blue cones) | #00BCC7 | 0.113 |
| Achromatopsia (no color) | #A7A7A7 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66AAFA
#66AAFA
oklch(72.7% 0.136 253.6)
- #D99833
#D99833
oklch(72.7% 0.136 73.8)
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 #66AAFA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.056
- Carolina Blue #8AB8FE ΔE 0.057
- Periwinkle Blue #8F99FB ΔE 0.060
- Deep Sky Blue #00BFFF ΔE 0.064
- Chefchaouen Blue #4895EF ΔE 0.066
- Perrywinkle #8F8CE7 ΔE 0.084
- Dark Sky Blue #448EE4 ΔE 0.088
- Lightblue #7BC8F6 ΔE 0.089
Use #66AAFA 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.