Knock vs. RedFlag Comparison Chart

The most powerful notification system you'll never build. Knock is flexible, reliable notifications infrastructure that's built to scale with you. Use our APIs to engage users, power cross-channel workflows, and manage notification preferences. Move fast with a notification engine that’s ready to scale from your first welcome email to a cross-channel system that puts your customer first. With Knock, you get a team that’s dedicated to one thing and one thing only: your notifications. Start with email and in-app channels. Instantly add push, SMS, and Slack when you need them. Predictable pricing that scales with you. No upfront fees or infrastructure set up required. Power high volume notifications without spending valuable engineering time on messaging infrastructure.