Plivo is a cloud-based communication platform that enables businesses to build, scale and operate voice, SMS, and other communication channels. It helps companies create unified customer experiences, automate customer engagement, and improve customer service.
Twilio Voice lets you make and receive calls, send and receive SMS, and build powerful voice applications in the cloud, all with just a few lines of code.
Nexmo provides APIs to add voice, messaging, and authentication to any app. It allows developers to quickly build, scale, and manage communications experiences that are reliable, secure, and global.