Knock
Free planCustomer engagement infrastructure for product-led growth, enabling cross-channel messaging and data activation.
4.6 /5 on G2 · 148 ratings, Sep 2026
Key features
- Send messages across email, SMS, push, chat, and in-app
- Drag-and-drop editor for messaging journeys
- Global styles, layouts, reusable blocks, and live previews for on-brand messaging
Pros
- Comprehensive cross-channel messaging capabilities
- Strong developer-first approach with SDKs, CLI, and AI IDE integration
Cons
- Pricing for higher volumes can become significant with per-message/user costs
- Enterprise features like advanced security and support require custom quotes