#66AACF
Closest named color: Greyblue (#77A1B5). oklch(70.7% 0.088 233.7), rgb(102, 170, 207).
Aa
Black text reads best on this color (8.21:1).
About this color
#66AACF is a medium-light, moderately saturated blue. In OKLCH its lightness is 71%, its chroma 0.088 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.040 away. Black text reads best on it, at 8.21:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 8.21:1 |
| White text | 2.55:1 |
Values
| HEX | #66AACF |
| RGB | rgb(102, 170, 207) |
| HSL | hsl(201, 52%, 61%) |
| OKLCH | oklch(70.7% 0.088 233.7) |
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 #66AACF | 2.55:1 | Fails | Lc -55.0 | Large or bold text, headings |
| Black text on #66AACF | 8.21:1 | AAA | Lc 54.1 | Large or bold text, headings |
| #66AACF text on white | 2.55:1 | Fails | Lc 49.9 | Large or bold text, headings |
| #66AACF text on black | 8.21:1 | 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
#9EC7DF
oklch(80.8% 0.055 234)
-
Step 400
400 (this color)
#66AACF
oklch(70.7% 0.088 233.7)
-
Step 500
500
#3394C2
oklch(63.1% 0.112 233.4)
-
Step 600
600
#007DAC
oklch(55.5% 0.116 233.8)
-
Step 700
700
#006991
oklch(49% 0.102 233.6)
-
Step 800
800
#005678
oklch(42.7% 0.089 233.9)
-
Step 900
900
#0B4762
oklch(37.6% 0.073 234.1)
-
Step 950
950
#0A2A39
oklch(27% 0.046 232.6)
#66AACF 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) | #98A8D1 | 0.057 |
| Deuteranopia (no green cones) | #8A9DCE | 0.050 |
| Tritanopia (no blue cones) | #2BB4B6 | 0.067 |
| Achromatopsia (no color) | #A2A2A2 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66AACF
#66AACF
oklch(70.7% 0.088 233.7)
- #CC926C
#CC926C
oklch(70.8% 0.088 54)
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 #66AACF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.040
- Bluegrey #85A3B2 ΔE 0.049
- Bluey Grey #89A0B0 ΔE 0.055
- Turquoise Blue #06B1C4 ΔE 0.056
- Cool Steel #97A7B3 ΔE 0.064
- Cool Gray #8D99AE ΔE 0.066
- Cadet Blue #5F9EA0 ΔE 0.071
- Cool Grey #95A3A6 ΔE 0.073
Use #66AACF 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.