The page is taking too much time to load, but maybe it is my internet connection.

On the other hand, how can I be sure WhatsApp will not put your service down, since they have done that for every service that tried to use WhatsApp in a different manner than what it is originally intended?

Thanks for feedback. We do not use WhatsApp in any ways, our button just shows the company WhatsApp number on a website.

Hi! A lot of businesses across the world use different messaging apps for chatting with customers. So we've made multi chat widget to help customers start conversation with bussines. It's free and no need registration.

I'd appreciate any feedback. Thanks!

Can it show that I'm currently offline when I am? (or even be hidden during that time?)

Unfortunately it cannot. But I think one of the biggest advantage of messaging apps is availability at any time. Customer can send you a message and its OK, if you will reply on 24 hours.