Courier

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.