#6669CC
Closest named color: Dark Periwinkle (#665FD1). oklch(56.7% 0.15 279.2), rgb(102, 105, 204).
Aa
White text reads best on this color (4.71:1).
About this color
#6669CC is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.150 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.027 away. White text reads best on it, at 4.71:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.45:1 |
| White text | 4.71:1 |
Values
| HEX | #6669CC |
| RGB | rgb(102, 105, 204) |
| HSL | hsl(238, 50%, 60%) |
| OKLCH | oklch(56.7% 0.15 279.2) |
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 #6669CC | 4.71:1 | AA | Lc -78.0 | Fine for body text |
| Black text on #6669CC | 4.45:1 | AA large text | Lc 31.6 | Non-text elements, placeholder text |
| #6669CC text on white | 4.71:1 | AA | Lc 72.5 | Content text, not long reading |
| #6669CC text on black | 4.45:1 | AA large text | Lc -29.2 | Dividers and decoration only |
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 600.
-
Step 50
50
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E9F7
oklch(93.7% 0.019 279.5)
-
Step 200
200
#D3D7F2
oklch(88.4% 0.037 278.9)
-
Step 300
300
#B7BDEC
oklch(81% 0.067 279.1)
-
Step 400
400
#9299E3
oklch(70.7% 0.108 279.1)
-
Step 500
500
#797EDB
oklch(63.1% 0.138 279.3)
-
Step 600
600 (this color)
#6669CC
oklch(56.7% 0.15 279.2)
-
Step 700
700
#5254AD
oklch(49.1% 0.139 279)
-
Step 800
800
#43458C
oklch(42.7% 0.115 279.1)
-
Step 900
900
#383B70
oklch(37.7% 0.089 278.7)
-
Step 950
950
#212342
oklch(27.1% 0.057 279.1)
#6669CC 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) | #3C78D0 | 0.056 |
| Deuteranopia (no green cones) | #3370CA | 0.057 |
| Tritanopia (no blue cones) | #3E7E91 | 0.129 |
| Achromatopsia (no color) | #737373 | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6669CC
#6669CC
oklch(56.7% 0.15 279.2)
- #887700
#887700
oklch(56.8% 0.118 99.3)
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 #6669CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.027
- Slate Blue #6A5ACD ΔE 0.037
- Light Indigo #6D5ACF ΔE 0.037
- Iris #6258C4 ΔE 0.044
- Royal Blue #4169E1 ΔE 0.054
- Medium Slate Blue #7B68EE ΔE 0.061
- Warm Blue #4B57DB ΔE 0.066
- Windows Blue #3778BF ΔE 0.067
Use #6669CC 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.