#669FCC
Closest named color: Greyblue (#77A1B5). oklch(68.1% 0.09 243.4), rgb(102, 159, 204).
Aa
Black text reads best on this color (7.39:1).
About this color
#669FCC is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.090 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.040 away. Black text reads best on it, at 7.39:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.39:1 |
| White text | 2.83:1 |
Values
| HEX | #669FCC |
| RGB | rgb(102, 159, 204) |
| HSL | hsl(206, 50%, 60%) |
| OKLCH | oklch(68.1% 0.09 243.4) |
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 #669FCC | 2.83:1 | Fails | Lc -59.6 | Large or bold text, headings |
| Black text on #669FCC | 7.39:1 | AAA | Lc 49.7 | Large or bold text, headings |
| #669FCC text on white | 2.83:1 | Fails | Lc 54.3 | Large or bold text, headings |
| #669FCC text on black | 7.39:1 | AAA | Lc -47.5 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C8DCED
oklch(88.5% 0.032 243.7)
-
Step 300
300
#A2C5E3
oklch(80.8% 0.057 244.4)
-
Step 400
400 (this color)
#669FCC
oklch(68.1% 0.09 243.4)
-
Step 500
500
#4390C9
oklch(63% 0.115 243.5)
-
Step 600
600
#1C7AB6
oklch(55.7% 0.124 243.1)
-
Step 700
700
#0B669D
oklch(49.1% 0.116 243.6)
-
Step 800
800
#10537F
oklch(42.6% 0.096 243.8)
-
Step 900
900
#174566
oklch(37.6% 0.075 243.7)
-
Step 950
950
#0F293C
oklch(27.1% 0.048 243)
#669FCC 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) | #8C9FCE | 0.045 |
| Deuteranopia (no green cones) | #7E95CB | 0.036 |
| Tritanopia (no blue cones) | #32AAAE | 0.075 |
| Achromatopsia (no color) | #999999 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #669FCC
#669FCC
oklch(68.1% 0.09 243.4)
- #C08C5C
#C08C5C
oklch(68% 0.09 63.1)
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 #669FCC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.040
- Faded Blue #658CBB ΔE 0.053
- Bluegrey #85A3B2 ΔE 0.055
- Bluey Grey #89A0B0 ΔE 0.056
- Cool Gray #8D99AE ΔE 0.058
- Silver Lake Blue #778DA9 ΔE 0.062
- Cornflower Blue #6495ED ΔE 0.063
- Blue Grey #758DA3 ΔE 0.067
Use #669FCC 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.