#66AACE
Closest named color: Greyblue (#77A1B5). oklch(70.7% 0.087 233), rgb(102, 170, 206).
Aa
Black text reads best on this color (8.20:1).
About this color
#66AACE is a medium-light, moderately saturated blue. In OKLCH its lightness is 71%, its chroma 0.087 and its hue 233°. 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 8.20:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 8.20:1 |
| White text | 2.55:1 |
Values
| HEX | #66AACE |
| RGB | rgb(102, 170, 206) |
| HSL | hsl(201, 51%, 60%) |
| OKLCH | oklch(70.7% 0.087 233) |
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 #66AACE | 2.55:1 | Fails | Lc -55.1 | Large or bold text, headings |
| Black text on #66AACE | 8.20:1 | AAA | Lc 54.0 | Large or bold text, headings |
| #66AACE text on white | 2.55:1 | Fails | Lc 50.0 | Large or bold text, headings |
| #66AACE text on black | 8.20:1 | AAA | Lc -52.0 | 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
#E0ECF3
oklch(93.6% 0.016 233)
-
Step 200
200
#C6DDEA
oklch(88.4% 0.03 232.5)
-
Step 300
300
#9EC7DE
oklch(80.8% 0.054 232.9)
-
Step 400
400 (this color)
#66AACE
oklch(70.7% 0.087 233)
-
Step 500
500
#3394C1
oklch(63% 0.111 232.8)
-
Step 600
600
#007DAB
oklch(55.5% 0.115 233.2)
-
Step 700
700
#006990
oklch(49% 0.101 232.9)
-
Step 800
800
#005677
oklch(42.6% 0.088 233.1)
-
Step 900
900
#0B4762
oklch(37.6% 0.073 234.1)
-
Step 950
950
#0A2A39
oklch(27% 0.046 232.6)
#66AACE 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) | #99A8D0 | 0.059 |
| Deuteranopia (no green cones) | #8A9DCD | 0.050 |
| Tritanopia (no blue cones) | #2CB4B6 | 0.066 |
| Achromatopsia (no color) | #A2A2A2 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66AACE
#66AACE
oklch(70.7% 0.087 233)
- #CC926D
#CC926D
oklch(70.8% 0.087 53.4)
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 #66AACE, 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 0.048
- Bluey Grey #89A0B0 ΔE 0.054
- Turquoise Blue #06B1C4 ΔE 0.055
- Cool Steel #97A7B3 ΔE 0.063
- Cool Gray #8D99AE ΔE 0.065
- Cadet Blue #5F9EA0 ΔE 0.070
- Cool Grey #95A3A6 ΔE 0.072
Use #66AACE 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.