#64B4DA
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(73.4% 0.096 230.6), rgb(100, 180, 218).
Aa
Black text reads best on this color (9.08:1).
About this color
#64B4DA is a medium-light, moderately saturated blue. In OKLCH its lightness is 73%, its chroma 0.096 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.057 away. Black text reads best on it, at 9.08:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.08:1 |
| White text | 2.31:1 |
Values
| HEX | #64B4DA |
| RGB | rgb(100, 180, 218) |
| HSL | hsl(199, 61%, 62%) |
| OKLCH | oklch(73.4% 0.096 230.6) |
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 #64B4DA | 2.31:1 | Fails | Lc -50.3 | Large or bold text, headings |
| Black text on #64B4DA | 9.08:1 | AAA | Lc 58.5 | Large or bold text, headings |
| #64B4DA text on white | 2.31:1 | Fails | Lc 45.4 | Large or bold text, headings |
| #64B4DA text on black | 9.08:1 | AAA | Lc -56.7 | 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
#F0F7FA
oklch(97.2% 0.008 225.1)
-
Step 100
100
#DFECF3
oklch(93.5% 0.017 230.9)
-
Step 200
200
#C4DEEB
oklch(88.5% 0.033 229.3)
-
Step 300
300
#99C8E0
oklch(80.8% 0.06 230.6)
-
Step 400
400 (this color)
#64B4DA
oklch(73.4% 0.096 230.6)
-
Step 500
500
#1496C5
oklch(63.1% 0.122 230.2)
-
Step 600
600
#007EA8
oklch(55.6% 0.112 230.6)
-
Step 700
700
#006A8E
oklch(49.1% 0.099 230.6)
-
Step 800
800
#005775
oklch(42.8% 0.086 230.3)
-
Step 900
900
#004862
oklch(37.7% 0.076 230.8)
-
Step 950
950
#042B3A
oklch(27.1% 0.05 229)
#64B4DA 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) | #A1B2DC | 0.067 |
| Deuteranopia (no green cones) | #90A5D9 | 0.058 |
| Tritanopia (no blue cones) | #00BFC0 | 0.072 |
| Achromatopsia (no color) | #AAAAAA | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #64B4DA
#64B4DA
oklch(73.4% 0.096 230.6)
- #DA9771
#DA9771
oklch(73.4% 0.096 50.3)
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 #64B4DA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.057
- Turquoise Blue #06B1C4 ΔE 0.060
- Deep Sky Blue #00BFFF ΔE 0.062
- Greyblue #77A1B5 ΔE 0.064
- Bluegrey #85A3B2 ΔE 0.066
- Lightblue #7BC8F6 ΔE 0.067
- Light Grey Blue #9DBCD4 ΔE 0.068
- Carolina Blue #8AB8FE ΔE 0.068
Use #64B4DA 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.