Click to chat

From the developer that brought to you the Click to chat app (originally known as Open in WhatsApp) here comes the web version, as simple as possible.
No cookies, no ads, not even options, but only the click to chat feature! (although it does use GoatCounter for privacy-friendly web analytics).
Will probably update it if enough interest (or you can suggest changes, GitHub link below).

This web uses WhatsApp public API to open a chat with any number you enter (you and that number).
Usage: Insert the number and the prefix with no extra characters, only numbers 0–9. More info here.
Example: for +44 (UK) 123 456 7890 write 44 1234567890