Twilio is one of the leading communication platforms as it provides its communication API which is very easy to integrate with websites or applications. It supports communication of all types including voice, video, SMS, MMS, WhatsApp, and emails.

However, Twilio lacks free incoming SMS and free support team coverage. Therefore it has many CPaaS competitors. Two of the Twilio alternatives are 

It is a very flexible communication API provider. It provides personalized video service and advanced analytics. It also provides a set of software development kits. With this you can also do social media messaging and run SMS campaigns.

It is a cloud communication platform that offers several communication APIs. 

It offers features like call transcriptions, text-to-speech, recording live text message notifications, and detailed insights