#668FEA
Closest named color: Cornflower Blue (#6495ED). oklch(66.1% 0.143 264.5), rgb(102, 143, 234).
Aa
Black text reads best on this color (6.68:1).
About this color
#668FEA is a medium-light, vivid blue. In OKLCH its lightness is 66%, its chroma 0.143 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.015 away. Black text reads best on it, at 6.68:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 6.68:1 |
| White text | 3.14:1 |
Values
| HEX | #668FEA |
| RGB | rgb(102, 143, 234) |
| HSL | hsl(221, 76%, 66%) |
| OKLCH | oklch(66.1% 0.143 264.5) |
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 #668FEA | 3.14:1 | AA large text | Lc -63.7 | Content text, not long reading |
| Black text on #668FEA | 6.68:1 | AA | Lc 45.7 | Large or bold text, headings |
| #668FEA text on white | 3.14:1 | AA large text | Lc 58.3 | Large or bold text, headings |
| #668FEA text on black | 6.68:1 | AA | Lc -43.4 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CCD9F4
oklch(88.4% 0.04 265.1)
-
Step 300
300
#AAC1EF
oklch(81% 0.07 264.1)
-
Step 400
400
#7D9FE7
oklch(70.7% 0.113 264.4)
-
Step 500
500 (this color)
#668FEA
oklch(66.1% 0.143 264.5)
-
Step 600
600
#446DCD
oklch(55.5% 0.156 264.5)
-
Step 700
700
#365BB2
oklch(49.2% 0.145 264.4)
-
Step 800
800
#2D4B90
oklch(42.8% 0.119 264.3)
-
Step 900
900
#283F73
oklch(37.7% 0.094 264.4)
-
Step 950
950
#182543
oklch(27% 0.059 265)
#668FEA 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) | #6998EE | 0.024 |
| Deuteranopia (no green cones) | #588CE8 | 0.018 |
| Tritanopia (no blue cones) | #00A3B1 | 0.129 |
| Achromatopsia (no color) | #919191 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #668FEA
#668FEA
oklch(66.1% 0.143 264.5)
- #B98A00
#B98A00
oklch(66.1% 0.136 84.3)
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 #668FEA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.015
- Soft Blue #6488EA ΔE 0.019
- Chefchaouen Blue #4895EF ΔE 0.029
- Dark Sky Blue #448EE4 ΔE 0.035
- Perrywinkle #8F8CE7 ΔE 0.051
- Lavender Blue #8B88F8 ΔE 0.054
- Dodger Blue #1E90FF ΔE 0.058
- Cornflower #6A79F7 ΔE 0.062
Use #668FEA 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.