No need to develop chatting tool, Low cost for using such tool

Not having to implement it by ourselves :)

Our product relies heavily on the messaging aspect, so we chose our chat SDK really carefully. Before settling on SendBird, we tried about 10 different chat SDKs. SendBird was the clear choice for us due to how customizable and flexible it is. This flexibility gave us the freedom to easily build many features using their SDK. Sendbird is still evolving. We sometimes experience service issues and interruptions from time to time. However, their customer support is really amazing and they have been extremely helpful. They even built specific features we suggested. TL;DR: Go for it!

I launched my app Pro Photo Shoot using SendBird as the engine for in-app messaging. I was very pleased with the way the API handled conversations, as it really took a lot of work out of the process, which can be very complicated if building from scratch. A few things in the suggestion box: - Faster, faster, faster! Make the API as fast as possible. - Improve your console to make it easier to drill down into a conversation when needed

Very pleasant and would recommend using Sendbird to other engineers looking for chat integration.