I will personally put them this way:
1. Tawk.to - $0 to $9/month (unlimited users)
Tawk.to is free, and it doesn't affect your website's performance. In order to remove their logo, you'll need to pay the monthly fee of 5$ per month.
- It's free.
- Fast loading.
- Minimal (not many configurations needed).
- You can hire support agents through their platform automatically for as low as $1/hour.
2. PureChat $0-$19/month (5 users)
PureChat is a bit limited, even their paid plan ($9) includes branding and limited to a single website which is bad. But their $19 package is not as limited but allows for only 5 users, which is even worse. I personally believe Tawk.to has everything you're going to need on their basic plan more than PureChat's best plans.
3. Intercom Chat $53-$123/month (Advanced)
I made this 3rd due to its pricing. Intercom is "the best" chatting, and customer sales support application available in the market right now. It's a solid app and it's generally used by medium and large businesses alike. It allows an unlimited number of users, chats or teams. This one is highly recommended if you have that kind of big support team.