#669FC5
Closest named color: Greyblue (#77A1B5). oklch(67.8% 0.082 238.8), rgb(102, 159, 197).
Aa
Black text reads best on this color (7.33:1).
About this color
#669FC5 is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.082 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.031 away. Black text reads best on it, at 7.33:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.33:1 |
| White text | 2.86:1 |
Values
| HEX | #669FC5 |
| RGB | rgb(102, 159, 197) |
| HSL | hsl(204, 45%, 59%) |
| OKLCH | oklch(67.8% 0.082 238.8) |
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 #669FC5 | 2.86:1 | Fails | Lc -60.0 | Content text, not long reading |
| Black text on #669FC5 | 7.33:1 | AAA | Lc 49.3 | Large or bold text, headings |
| #669FC5 text on white | 2.86:1 | Fails | Lc 54.7 | Large or bold text, headings |
| #669FC5 text on black | 7.33:1 | AAA | Lc -47.1 | 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
#E1EBF3
oklch(93.5% 0.015 241.8)
-
Step 200
200
#C9DCEA
oklch(88.5% 0.028 239.7)
-
Step 300
300
#A3C6DF
oklch(80.9% 0.052 239.4)
-
Step 400
400 (this color)
#669FC5
oklch(67.8% 0.082 238.8)
-
Step 500
500
#4492C2
oklch(63.1% 0.105 238.6)
-
Step 600
600
#1E7BAE
oklch(55.5% 0.114 238.8)
-
Step 700
700
#0C6896
oklch(49.2% 0.106 238.6)
-
Step 800
800
#115579
oklch(42.8% 0.087 238.1)
-
Step 900
900
#184662
oklch(37.7% 0.069 239.2)
-
Step 950
950
#102939
oklch(26.9% 0.043 239.2)
#669FC5 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) | #8E9EC7 | 0.047 |
| Deuteranopia (no green cones) | #8194C4 | 0.041 |
| Tritanopia (no blue cones) | #39A9AC | 0.065 |
| Achromatopsia (no color) | #999999 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #669FC5
#669FC5
oklch(67.8% 0.082 238.8)
- #BE8B64
#BE8B64
oklch(67.7% 0.082 58.2)
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 #669FC5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.031
- Bluegrey #85A3B2 ΔE 0.048
- Bluey Grey #89A0B0 ΔE 0.050
- Faded Blue #658CBB ΔE 0.052
- Cool Gray #8D99AE ΔE 0.053
- Silver Lake Blue #778DA9 ΔE 0.056
- Cadet Blue #5F9EA0 ΔE 0.057
- Blue Grey #758DA3 ΔE 0.060
Use #669FC5 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.