#668CDB
Closest named color: Soft Blue (#6488EA). oklch(64.7% 0.126 263.8), rgb(102, 140, 219).
Aa
Black text reads best on this color (6.33:1).
About this color
#668CDB is a medium-light, moderately saturated blue. In OKLCH its lightness is 65%, its chroma 0.126 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Soft Blue (#6488EA), ΔE 0.027 away. Black text reads best on it, at 6.33:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Soft Blue (#6488EA) |
| Black text | 6.33:1 |
| White text | 3.31:1 |
Values
| HEX | #668CDB |
| RGB | rgb(102, 140, 219) |
| HSL | hsl(221, 62%, 63%) |
| OKLCH | oklch(64.7% 0.126 263.8) |
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 #668CDB | 3.31:1 | AA large text | Lc -65.8 | Content text, not long reading |
| Black text on #668CDB | 6.33:1 | AA | Lc 43.7 | Non-text elements, placeholder text |
| #668CDB text on white | 3.31:1 | AA large text | Lc 60.4 | Content text, not long reading |
| #668CDB text on black | 6.33:1 | AA | Lc -41.3 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CEDAF1
oklch(88.6% 0.034 263.6)
-
Step 300
300
#ACC1E9
oklch(80.9% 0.061 263.2)
-
Step 400
400
#81A0DF
oklch(70.7% 0.099 263.9)
-
Step 500
500 (this color)
#668CDB
oklch(64.7% 0.126 263.8)
-
Step 600
600
#496FC3
oklch(55.5% 0.138 264.1)
-
Step 700
700
#3A5DA8
oklch(49.1% 0.127 263.6)
-
Step 800
800
#304C88
oklch(42.6% 0.105 263.7)
-
Step 900
900
#2A406D
oklch(37.7% 0.082 263.3)
-
Step 950
950
#192640
oklch(27.1% 0.052 263.2)
#668CDB 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) | #6C93DE | 0.021 |
| Deuteranopia (no green cones) | #5E88D9 | 0.015 |
| Tritanopia (no blue cones) | #279DA9 | 0.113 |
| Achromatopsia (no color) | #8D8D8D | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #668CDB
#668CDB
oklch(64.7% 0.126 263.8)
- #B38619
#B38619
oklch(64.7% 0.126 83.3)
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 #668CDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Soft Blue #6488EA ΔE 0.027
- Cornflower Blue #6495ED ΔE 0.032
- Dark Sky Blue #448EE4 ΔE 0.033
- Chefchaouen Blue #4895EF ΔE 0.040
- Faded Blue #658CBB ΔE 0.049
- Perrywinkle #8F8CE7 ΔE 0.057
- Cool Blue #4984B8 ΔE 0.066
- Lavender Blue #8B88F8 ΔE 0.067
Use #668CDB 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.