#669CC3
Closest named color: Greyblue (#77A1B5). oklch(67% 0.082 240.9), rgb(102, 156, 195).
Aa
Black text reads best on this color (7.10:1).
About this color
#669CC3 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.082 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.034 away. Black text reads best on it, at 7.10:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.10:1 |
| White text | 2.95:1 |
Values
| HEX | #669CC3 |
| RGB | rgb(102, 156, 195) |
| HSL | hsl(205, 44%, 58%) |
| OKLCH | oklch(67% 0.082 240.9) |
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 #669CC3 | 2.95:1 | Fails | Lc -61.3 | Content text, not long reading |
| Black text on #669CC3 | 7.10:1 | AAA | Lc 48.1 | Large or bold text, headings |
| #669CC3 text on white | 2.95:1 | Fails | Lc 56.0 | Large or bold text, headings |
| #669CC3 text on black | 7.10:1 | AAA | Lc -45.8 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#C9DCEA
oklch(88.5% 0.028 239.7)
-
Step 300
300
#A4C6DF
oklch(81% 0.051 240.1)
-
Step 400
400 (this color)
#669CC3
oklch(67% 0.082 240.9)
-
Step 500
500
#4891C2
oklch(63.1% 0.104 240.5)
-
Step 600
600
#257AAF
oklch(55.5% 0.114 241.2)
-
Step 700
700
#166796
oklch(49.1% 0.105 240.6)
-
Step 800
800
#17547A
oklch(42.7% 0.087 241.1)
-
Step 900
900
#1B4662
oklch(37.8% 0.067 240.5)
-
Step 950
950
#112939
oklch(27% 0.042 240.1)
#669CC3 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) | #8B9CC5 | 0.044 |
| Deuteranopia (no green cones) | #7F92C2 | 0.037 |
| Tritanopia (no blue cones) | #3BA6A9 | 0.067 |
| Achromatopsia (no color) | #969696 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #669CC3
#669CC3
oklch(67% 0.082 240.9)
- #BA8A61
#BA8A61
oklch(67% 0.081 61.3)
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 #669CC3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.034
- Faded Blue #658CBB ΔE 0.044
- Silver Lake Blue #778DA9 ΔE 0.049
- Bluegrey #85A3B2 ΔE 0.051
- Bluey Grey #89A0B0 ΔE 0.052
- Cool Gray #8D99AE ΔE 0.052
- Blue Grey #758DA3 ΔE 0.054
- Cadet Blue #5F9EA0 ΔE 0.057
Use #669CC3 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.