#669FFF
Closest named color: Cornflower Blue (#6495ED). oklch(70.7% 0.154 260.3), rgb(102, 159, 255).
Aa
Black text reads best on this color (7.96:1).
About this color
#669FFF is a medium-light, vivid blue. In OKLCH its lightness is 71%, its chroma 0.154 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.034 away. Black text reads best on it, at 7.96:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.96:1 |
| White text | 2.63:1 |
Values
| HEX | #669FFF |
| RGB | rgb(102, 159, 255) |
| HSL | hsl(218, 100%, 70%) |
| OKLCH | oklch(70.7% 0.154 260.3) |
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 #669FFF | 2.63:1 | Fails | Lc -56.3 | Large or bold text, headings |
| Black text on #669FFF | 7.96:1 | AAA | Lc 52.9 | Large or bold text, headings |
| #669FFF text on white | 2.63:1 | Fails | Lc 51.1 | Large or bold text, headings |
| #669FFF text on black | 7.96:1 | AAA | Lc -50.8 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#DFEBFD
oklch(93.6% 0.028 258.4)
-
Step 200
200
#C5DAFD
oklch(88.4% 0.054 260.6)
-
Step 300
300
#9DC2FF
oklch(81% 0.096 260.2)
-
Step 400
400 (this color)
#669FFF
oklch(70.7% 0.154 260.3)
-
Step 500
500
#3B83FE
oklch(63.1% 0.197 260.4)
-
Step 600
600
#1669ED
oklch(55.6% 0.213 260.3)
-
Step 700
700
#0656CE
oklch(49.1% 0.198 260.3)
-
Step 800
800
#0B47A7
oklch(42.7% 0.165 260.4)
-
Step 900
900
#133D84
oklch(37.7% 0.128 260.4)
-
Step 950
950
#0C254D
oklch(27.1% 0.08 259.5)
#669FFF 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) | #76A7FF | 0.029 |
| Deuteranopia (no green cones) | #6199FD | 0.017 |
| Tritanopia (no blue cones) | #00B5C3 | 0.131 |
| Achromatopsia (no color) | #9F9F9F | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #669FFF
#669FFF
oklch(70.7% 0.154 260.3)
- #CF9400
#CF9400
oklch(70.6% 0.146 80.1)
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 #669FFF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.034
- Chefchaouen Blue #4895EF ΔE 0.046
- Periwinkle Blue #8F99FB ΔE 0.047
- Soft Blue #6488EA ΔE 0.063
- Lavender Blue #8B88F8 ΔE 0.067
- Perrywinkle #8F8CE7 ΔE 0.067
- Dark Sky Blue #448EE4 ΔE 0.068
- Dodger Blue #1E90FF ΔE 0.069
Use #669FFF 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.