You are absolutely correct. Twilio could get expensive really fast as your startup experience a jump in the user base. Currently, we are working on rolling our own chat system using ejabberd. Ejabberd is the default go-to choice in implementation of chat systems. Technically all famous chat apps are based on a variation of ejabberd.

Anyhow, I’d argue for a small startup Twilio would serve well.

Software Engineer living in the Bay Area

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