Shopify Inbox

Provides the chat feature we wanted but there is a performance trade off for website speed (67 down to 47). While this isn't impacting end-user experience (pages still delivering in <2s) it is something to be aware of. The ability to assign particular chats to staff is useful in a larger shop than our but a nice feature. Mobile access is another great feature that in our shop we don't fully leverage but it has come in handy more than once.
If it's possible to make it more lightweight I can easily see a higher rating.