Built for developers, Courier is the fastest way to add multi-channel product notifications to your web, desktop, or mobile app. Make developers' lives easier with a suite of features like automations, preferences management, audit logs, and white-labeling. Trusted by innovative startups like Lattice, LaunchDarkly, Contentful, Apartment List, and Vendr. Backed by Y Combinator, Bessemer Venture Partners, Matrix Partners, Twilio, and Slack Fund.