Knock
Knock is a customer engagement infrastructure designed for product-led growth, allowing businesses to send product, marketing, and transactional messaging across vario…
Our verdict
Who it's for
Customer engagement infrastructure for product-led growth, enabling cross-channel messaging and data activation.
Who should look elsewhere
Pricing for higher volumes can become significant with per-message/user costs
Pros
- +Comprehensive cross-channel messaging capabilities
- +Strong developer-first approach with SDKs, CLI, and AI IDE integration
- +Robust data integration and personalization features
- +High scalability and reliability (99.99% uptime, handles hundreds of millions of messages)
- +Compliance with HIPAA, SOC2, GDPR, CCPA
Cons
- −Pricing for higher volumes can become significant with per-message/user costs
- −Enterprise features like advanced security and support require custom quotes
- −Requires technical integration for full utilization of developer tools
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
- ✓Preference centers and send windows for user-first controls
- ✓In-app messaging with custom components (paywalls, dialogs, nudges)
- ✓Real-time data ingestion from product, warehouse, CDP, and reverse ETL sources
- ✓Dynamic segmentation using attributes, events, and relations
- ✓Trigger workflows from API calls, usage events, or segment changes
Pricing
| Plan | Price | Billing | Notes |
|---|---|---|---|
| Developer | $0 | month | 10K messages; 500 guide active users; Unlimited notification workflows |
| Starter | $250 | month · per seat | 50K messages; Prepaid usage, then $.005 per message; 2.5K guide active users |
| Enterprise | — | month | Flexible volume-based pricing; Discounts available for high-volume customers; Monthly notified user pricing available |