WhatsApp Chat Button & More

The Chat button widget by GetButton.io (formerly WhatsHelp widget) takes website visitors directly to the messaging app such as Facebook Messenger or WhatsApp and allows them to initiate a conversation with you.

Pros:

• Supports Facebook Messenger, WhatsApp, Viber, Snapchat, Line, Telegram.
• It's quick to install and you can customize it according to your brand style. 
• Works on desktops, tablets, and mobile devices.

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Cons:

• It's an extremely basic and barebones solution. 
• It does have a free version but most features you need will come with an additional fee. 
• Reviews suggest it can slow down the overall performance of the website.