#66BDFE
Closest named color: Carolina Blue (#8AB8FE). oklch(77% 0.126 243), rgb(102, 189, 254).
Aa
Black text reads best on this color (10.27:1).
About this color
#66BDFE is a medium-light, moderately saturated blue. In OKLCH its lightness is 77%, its chroma 0.126 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Carolina Blue (#8AB8FE), ΔE 0.036 away. Black text reads best on it, at 10.27:1.
| Hue family | Blues |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Carolina Blue (#8AB8FE) |
| Black text | 10.27:1 |
| White text | 2.04:1 |
Values
| HEX | #66BDFE |
| RGB | rgb(102, 189, 254) |
| HSL | hsl(206, 99%, 70%) |
| OKLCH | oklch(77% 0.126 243) |
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 #66BDFE | 2.04:1 | Fails | Lc -44.1 | Non-text elements, placeholder text |
| Black text on #66BDFE | 10.27:1 | AAA | Lc 64.4 | Content text, not long reading |
| #66BDFE text on white | 2.04:1 | Fails | Lc 39.6 | Non-text elements, placeholder text |
| #66BDFE text on black | 10.27:1 | AAA | Lc -62.8 | Content text, not long reading |
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 300.
-
Step 50
50
#EDF7FF
oklch(97.1% 0.015 241.8)
-
Step 100
100
#D8EDFF
oklch(93.6% 0.033 244)
-
Step 200
200
#B7DFFF
oklch(88.6% 0.061 242.5)
-
Step 300
300 (this color)
#66BDFE
oklch(77% 0.126 243)
-
Step 400
400
#15A9FF
oklch(70.6% 0.167 243.2)
-
Step 500
500
#0091DD
oklch(63.1% 0.152 242.9)
-
Step 600
600
#007ABB
oklch(55.7% 0.134 242.9)
-
Step 700
700
#00669E
oklch(49% 0.119 243.2)
-
Step 800
800
#005482
oklch(42.8% 0.102 242.4)
-
Step 900
900
#00466E
oklch(37.8% 0.091 242.8)
-
Step 950
950
#002943
oklch(27% 0.065 242.6)
#66BDFE 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) | #A0BEFF | 0.061 |
| Deuteranopia (no green cones) | #8CAFFD | 0.049 |
| Tritanopia (no blue cones) | #00CDD3 | 0.097 |
| Achromatopsia (no color) | #B5B5B5 | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66BDFE
#66BDFE
oklch(77% 0.126 243)
- #EDA259
#EDA259
oklch(77.2% 0.126 63.2)
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 #66BDFE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Carolina Blue #8AB8FE ΔE 0.036
- Lightblue #7BC8F6 ΔE 0.041
- Deep Sky Blue #00BFFF ΔE 0.042
- Vivid Sky Blue #4CC9F0 ΔE 0.046
- Sky #82CAFC ΔE 0.047
- Bright Sky Blue #02CCFE ΔE 0.052
- Light Sky Blue #87CEFA ΔE 0.060
- Pastel Blue #A2BFFE ΔE 0.063
Use #66BDFE 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.