#669CB9
Closest named color: Greyblue (#77A1B5). oklch(66.6% 0.072 232.8), rgb(102, 156, 185).
Aa
Black text reads best on this color (7.02:1).
About this color
#669CB9 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.072 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.026 away. Black text reads best on it, at 7.02:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.02:1 |
| White text | 2.99:1 |
Values
| HEX | #669CB9 |
| RGB | rgb(102, 156, 185) |
| HSL | hsl(201, 37%, 56%) |
| OKLCH | oklch(66.6% 0.072 232.8) |
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 #669CB9 | 2.99:1 | Fails | Lc -61.8 | Content text, not long reading |
| Black text on #669CB9 | 7.02:1 | AAA | Lc 47.6 | Large or bold text, headings |
| #669CB9 text on white | 2.99:1 | Fails | Lc 56.5 | Large or bold text, headings |
| #669CB9 text on black | 7.02:1 | AAA | Lc -45.3 | 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 500.
-
Step 50
50
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E4EBF0
oklch(93.6% 0.01 238.5)
-
Step 200
200
#CDDCE4
oklch(88.6% 0.02 230.7)
-
Step 300
300
#ABC5D4
oklch(80.9% 0.035 233.2)
-
Step 400
400
#7EA7BE
oklch(70.7% 0.056 233.1)
-
Step 500
500 (this color)
#669CB9
oklch(66.6% 0.072 232.8)
-
Step 600
600
#407B99
oklch(55.6% 0.077 232.6)
-
Step 700
700
#316883
oklch(49.2% 0.072 232.2)
-
Step 800
800
#2A556A
oklch(42.8% 0.059 231.6)
-
Step 900
900
#274656
oklch(37.7% 0.046 232.3)
-
Step 950
950
#172933
oklch(27% 0.03 233.8)
#669CB9 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) | #8E9ABA | 0.048 |
| Deuteranopia (no green cones) | #8291B9 | 0.043 |
| Tritanopia (no blue cones) | #42A4A5 | 0.054 |
| Achromatopsia (no color) | #959595 | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #669CB9
#669CB9
oklch(66.6% 0.072 232.8)
- #B8886B
#B8886B
oklch(66.6% 0.072 52.3)
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 #669CB9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.026
- Cadet Blue #5F9EA0 ΔE 0.042
- Silver Lake Blue #778DA9 ΔE 0.043
- Bluegrey #85A3B2 ΔE 0.045
- Blue Grey #758DA3 ΔE 0.046
- Bluey Grey #89A0B0 ΔE 0.046
- Faded Blue #658CBB ΔE 0.047
- Cool Gray #8D99AE ΔE 0.047
Use #669CB9 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.