#66A1FE
Closest named color: Cornflower Blue (#6495ED). oklch(71% 0.15 259.2), rgb(102, 161, 254).
Aa
Black text reads best on this color (8.09:1).
About this color
#66A1FE is a medium-light, vivid blue. In OKLCH its lightness is 71%, its chroma 0.150 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.037 away. Black text reads best on it, at 8.09:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 8.09:1 |
| White text | 2.59:1 |
Values
| HEX | #66A1FE |
| RGB | rgb(102, 161, 254) |
| HSL | hsl(217, 99%, 70%) |
| OKLCH | oklch(71% 0.15 259.2) |
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 #66A1FE | 2.59:1 | Fails | Lc -55.6 | Large or bold text, headings |
| Black text on #66A1FE | 8.09:1 | AAA | Lc 53.5 | Large or bold text, headings |
| #66A1FE text on white | 2.59:1 | Fails | Lc 50.5 | Large or bold text, headings |
| #66A1FE text on black | 8.09:1 | AAA | Lc -51.5 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFD
oklch(93.6% 0.028 258.4)
-
Step 200
200
#C5DBFC
oklch(88.6% 0.051 258.4)
-
Step 300
300
#9CC2FD
oklch(80.8% 0.094 259)
-
Step 400
400 (this color)
#66A1FE
oklch(71% 0.15 259.2)
-
Step 500
500
#3885FB
oklch(63.2% 0.192 259)
-
Step 600
600
#0E6AEA
oklch(55.5% 0.209 259.3)
-
Step 700
700
#0058CA
oklch(49.1% 0.191 259.1)
-
Step 800
800
#0649A4
oklch(42.8% 0.159 258.9)
-
Step 900
900
#113E82
oklch(37.7% 0.125 259.1)
-
Step 950
950
#0C254C
oklch(27% 0.079 259.2)
#66A1FE 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) | #79A8FF | 0.029 |
| Deuteranopia (no green cones) | #659AFC | 0.018 |
| Tritanopia (no blue cones) | #00B6C3 | 0.128 |
| Achromatopsia (no color) | #A1A1A1 | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66A1FE
#66A1FE
oklch(71% 0.15 259.2)
- #D29500
#D29500
oklch(71.1% 0.148 79.4)
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 #66A1FE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.037
- Periwinkle Blue #8F99FB ΔE 0.048
- Chefchaouen Blue #4895EF ΔE 0.049
- Soft Blue #6488EA ΔE 0.067
- Perrywinkle #8F8CE7 ΔE 0.069
- Lavender Blue #8B88F8 ΔE 0.071
- Dark Sky Blue #448EE4 ΔE 0.071
- Dodger Blue #1E90FF ΔE 0.073
Use #66A1FE 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.