#669EFF
Closest named color: Cornflower Blue (#6495ED). oklch(70.4% 0.155 260.7), rgb(102, 158, 255).
Aa
Black text reads best on this color (7.89:1).
About this color
#669EFF is a medium-light, vivid blue. In OKLCH its lightness is 70%, its chroma 0.155 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.033 away. Black text reads best on it, at 7.89:1.
| Hue family | Blues |
| Lightness | medium-light (70%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.89:1 |
| White text | 2.65:1 |
Values
| HEX | #669EFF |
| RGB | rgb(102, 158, 255) |
| HSL | hsl(218, 100%, 70%) |
| OKLCH | oklch(70.4% 0.155 260.7) |
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 #669EFF | 2.65:1 | Fails | Lc -56.7 | Large or bold text, headings |
| Black text on #669EFF | 7.89:1 | AAA | Lc 52.5 | Large or bold text, headings |
| #669EFF text on white | 2.65:1 | Fails | Lc 51.5 | Large or bold text, headings |
| #669EFF text on black | 7.89:1 | AAA | Lc -50.4 | 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)
#669EFF
oklch(70.4% 0.155 260.7)
-
Step 500
500
#3C83FE
oklch(63.1% 0.197 260.6)
-
Step 600
600
#1968EE
oklch(55.6% 0.215 260.8)
-
Step 700
700
#0A56CF
oklch(49.2% 0.199 260.6)
-
Step 800
800
#0D47A7
oklch(42.7% 0.165 260.6)
-
Step 900
900
#143D84
oklch(37.7% 0.128 260.6)
-
Step 950
950
#0D244E
oklch(27% 0.083 261.2)
#669EFF 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) | #74A6FF | 0.027 |
| Deuteranopia (no green cones) | #5F98FD | 0.018 |
| Tritanopia (no blue cones) | #00B4C2 | 0.133 |
| Achromatopsia (no color) | #9F9F9F | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #669EFF
#669EFF
oklch(70.4% 0.155 260.7)
- #CE9400
#CE9400
oklch(70.4% 0.146 80.6)
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 #669EFF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.033
- Chefchaouen Blue #4895EF ΔE 0.045
- Periwinkle Blue #8F99FB ΔE 0.047
- Soft Blue #6488EA ΔE 0.061
- Lavender Blue #8B88F8 ΔE 0.065
- Perrywinkle #8F8CE7 ΔE 0.066
- Dark Sky Blue #448EE4 ΔE 0.067
- Dodger Blue #1E90FF ΔE 0.067
Use #669EFF 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.