#669DD4
Closest named color: Cornflower Blue (#6495ED). oklch(68% 0.101 249.5), rgb(102, 157, 212).
Aa
Black text reads best on this color (7.33:1).
About this color
#669DD4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.101 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.048 away. Black text reads best on it, at 7.33:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.33:1 |
| White text | 2.86:1 |
Values
| HEX | #669DD4 |
| RGB | rgb(102, 157, 212) |
| HSL | hsl(210, 56%, 62%) |
| OKLCH | oklch(68% 0.101 249.5) |
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 #669DD4 | 2.86:1 | Fails | Lc -59.9 | Large or bold text, headings |
| Black text on #669DD4 | 7.33:1 | AAA | Lc 49.4 | Large or bold text, headings |
| #669DD4 text on white | 2.86:1 | Fails | Lc 54.7 | Large or bold text, headings |
| #669DD4 text on black | 7.33:1 | AAA | Lc -47.2 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C8DCF0
oklch(88.6% 0.035 248.2)
-
Step 300
300
#A2C5E8
oklch(81% 0.062 248.6)
-
Step 400
400 (this color)
#669DD4
oklch(68% 0.101 249.5)
-
Step 500
500
#448ED4
oklch(63.2% 0.129 249.5)
-
Step 600
600
#2077C1
oklch(55.7% 0.139 249.4)
-
Step 700
700
#1063A6
oklch(49% 0.13 249.5)
-
Step 800
800
#135187
oklch(42.7% 0.108 249.9)
-
Step 900
900
#18446C
oklch(37.8% 0.084 249.3)
-
Step 950
950
#10283F
oklch(27% 0.053 249.5)
#669DD4 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) | #869FD6 | 0.038 |
| Deuteranopia (no green cones) | #7894D3 | 0.029 |
| Tritanopia (no blue cones) | #2AAAB0 | 0.087 |
| Achromatopsia (no color) | #999999 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #669DD4
#669DD4
oklch(68% 0.101 249.5)
- #C08D4F
#C08D4F
oklch(68% 0.101 70.1)
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 #669DD4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.048
- Faded Blue #658CBB ΔE 0.053
- Greyblue #77A1B5 ΔE 0.054
- Chefchaouen Blue #4895EF ΔE 0.057
- Dark Sky Blue #448EE4 ΔE 0.063
- Bluegrey #85A3B2 ΔE 0.067
- Cool Gray #8D99AE ΔE 0.068
- Silver Lake Blue #778DA9 ΔE 0.068
Use #669DD4 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.