All Specs Most people know the Twilio name in relation to the application programming interface (API) products it's developed across a variety of technologies, including not just email and messaging, but also the Internet of Things (IoT), voice over IP (VoIP) , and video. That API portfolio is where SendGrid Marketing Campaigns (SendGrid) was born, but the company has since worked to turn the platform into a fully rounded email marketing tool. SendGrid is designed for midsized companies looking to deliver email marketing campaigns at scale, since Twilio differentiates itself largely through its ability to handle very large email volumes. According to the company, Twilio SendGrid sent out 1 trillion emails in 2020, which Twilio claims is the largest volume of any cloud demand-side platforms (DSPs). Twilio anticipates increasing its email volume to 4 trillion in 2021, and says it's currently delivering approximately 90 billion emails a month.