#66A3CE
Closest named color: Greyblue (#77A1B5). oklch(69.1% 0.09 240.5), rgb(102, 163, 206).
Aa
Black text reads best on this color (7.69:1).
About this color
#66A3CE is a medium-light, moderately saturated blue. In OKLCH its lightness is 69%, its chroma 0.090 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.039 away. Black text reads best on it, at 7.69:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.69:1 |
| White text | 2.72:1 |
Values
| HEX | #66A3CE |
| RGB | rgb(102, 163, 206) |
| HSL | hsl(205, 51%, 60%) |
| OKLCH | oklch(69.1% 0.09 240.5) |
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 #66A3CE | 2.72:1 | Fails | Lc -57.9 | Large or bold text, headings |
| Black text on #66A3CE | 7.69:1 | AAA | Lc 51.3 | Large or bold text, headings |
| #66A3CE text on white | 2.72:1 | Fails | Lc 52.7 | Large or bold text, headings |
| #66A3CE text on black | 7.69:1 | AAA | Lc -49.2 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1ECF4
oklch(93.7% 0.016 239.1)
-
Step 200
200
#C8DCEC
oklch(88.4% 0.031 242)
-
Step 300
300
#A1C6E2
oklch(80.9% 0.056 241)
-
Step 400
400 (this color)
#66A3CE
oklch(69.1% 0.09 240.5)
-
Step 500
500
#3E92C8
oklch(63.2% 0.114 240.3)
-
Step 600
600
#0E7BB5
oklch(55.7% 0.125 240.6)
-
Step 700
700
#00679A
oklch(49.1% 0.113 240.5)
-
Step 800
800
#06547E
oklch(42.6% 0.096 240.8)
-
Step 900
900
#134665
oklch(37.7% 0.075 240.2)
-
Step 950
950
#0E293B
oklch(27% 0.047 240.8)
#66A3CE 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) | #90A3D0 | 0.049 |
| Deuteranopia (no green cones) | #8298CD | 0.041 |
| Tritanopia (no blue cones) | #2FAEB1 | 0.074 |
| Achromatopsia (no color) | #9C9C9C | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66A3CE
#66A3CE
oklch(69.1% 0.09 240.5)
- #C58E61
#C58E61
oklch(69% 0.09 59.8)
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 #66A3CE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.039
- Bluegrey #85A3B2 ΔE 0.052
- Bluey Grey #89A0B0 ΔE 0.055
- Cool Gray #8D99AE ΔE 0.060
- Faded Blue #658CBB ΔE 0.064
- Turquoise Blue #06B1C4 ΔE 0.065
- Cornflower Blue #6495ED ΔE 0.068
- Cadet Blue #5F9EA0 ΔE 0.069
Use #66A3CE 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.