Overview
Courier and Twilio are at different layers of the messaging stack. Twilio is a massive communication API platform. Courier is notification orchestration that can route through Twilio. For our take on each, see our Courier comparison.
Twilio's Communication Empire
Twilio handles SMS, voice, video, WhatsApp, and email (via SendGrid) at enterprise scale. It's the standard communication API platform. Courier is a much smaller company focused specifically on notification routing — a different and narrower problem.
Courier's Orchestration Value
Courier's value is in the routing layer — try push first, fall back to SMS via Twilio, then email via SendGrid. Manage user preferences. Switch providers without code changes. Without Courier, you'd build this routing logic yourself on top of Twilio.
The Sequenzy Alternative
For SaaS founders who need email (not SMS or voice), Sequenzy combines transactional email and marketing campaigns with Stripe integration at $49/month.