Agent-led customer engagement that's built to scale.
Modern teams choose Knock to manage all their messaging in one platform. Ship dynamic, cross-channel campaigns that drive engagement, growth, and retention.
The top reasons teams choose Knock over SuprSend
One system for all messaging
Manage your product, marketing, and transactional messaging from one place. Send messages across email, in-app, SMS, push, and chat, triggered from API calls, events, or audience changes.
Agent-led customer engagement
Knock is built for agents to do the work. Build complex customer journeys with a prompt, generate on-brand templates, and manage all your messaging from Claude, Slack, or the terminal.
Infrastructure-grade reliability
Knock's messaging infrastructure powers billions of notifications in production for world-class organizations like Vercel, Webflow, and Zapier, with 99.99% uptime, git-style versioning, and full observability.
Ship messaging without limits.
Flexible, AI-native tooling to build any messaging experience you want, without compromising on design, performance, or user experience.
Ship messaging without limits.
Flexible, AI-native tooling to build any messaging experience you want, without compromising on design, performance, or user experience.
Send messages across email, SMS, push, chat, and in-app.
Build complex messaging journeys with a single prompt.
Deliver messages when and where your users expect them.
Send messages across email, SMS, push, chat, and in-app.
Build complex messaging journeys with a single prompt.
Deliver messages when and where your users expect them.
Never build an email again. Generate beautiful, client-safe emails in your layout and branding.
User-first controls. Respect user time with preference centers and send windows.
Never build an email again. Generate beautiful, client-safe emails in your layout and branding.
User-first controls. Respect user time with preference centers and send windows.
Unify and activate your data.
Ingest real-time data from your product, tools, and warehouse so you can trigger relevant, timely messaging based on any user attribute, event, or action.
Unify and activate your data.
Ingest real-time data from your product, tools, and warehouse so you can trigger relevant, timely messaging based on any user attribute, event, or action.
Ingest data from your warehouse, CDP, reverse ETL, and webhooks.
Build dynamic segments using attributes, events, and relations.
Trigger workflows from API calls, usage events, or segment changes.
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![[object Object]](/_next/image?url=%2Fassets%2Fhome%2Ffeatures%2Ftrigger-workflows-mobile.png&w=3840&q=75)
Ingest data from your warehouse, CDP, reverse ETL, and webhooks.
Build dynamic segments using attributes, events, and relations.
Trigger workflows from API calls, usage events, or segment changes.
![[object Object]](/_next/image?url=%2Fassets%2Fhome%2Ffeatures%2Ftrigger-workflows-desktop.png&w=3840&q=75)
Model your data. Sync custom objects for audiences and personalized templates.
Personalize every message. Tailor messaging with AI-powered content, logic, and targeting.
Model your data. Sync custom objects for audiences and personalized templates.
Personalize every message. Tailor messaging with AI-powered content, logic, and targeting.
Knock vs. SuprSend feature comparison
| Feature | Knock | SuprSend |
|---|---|---|
| Visual and code-based template editor | ||
| Workflow functions: delay, HTTP request, batching, throttling | ||
| Separated environment for development, staging, and production | ||
| Schema-enforced workflow trigger data validation | ||
| Object model for non-user recipients such as Slack channels | ||
| Native In-app SDKs for iOS and Android | ||
| Full observability (API logs, message debugging) | ||
| Native in-app messaging components | ||
| CLI, API, and MCP server to manage your resources |
Frequently asked questions
What's the main difference between Knock and SuprSend?
Knock provides a developer-first notification infrastructure with React components, real-time feeds, and native cross-channel orchestration. It delivers enterprise-grade features like advanced batching, complex workflows, and production-ready components that integrate seamlessly with your existing stack.
SuprSend offers a unified API for multi-channel notifications with workflow capabilities, but lacks the depth of customization and developer tooling that Knock provides.
For example, SuprSend provides an embedded preference center for users to manage their notification preferences. Knock's preference model supports this, but also provides a way to model tenant-specific preferences for multi-tenant applications and more advanced preference conditions to power something like usage-based billing, e.g. 'I only want to get an email when my usage exceeds 70%.'
Another example is how Knock architects its client-side SDKs. SuprSend has prioritized a component-based experience, which means it's easy to get started, but more difficult to customize if you need specific design or functionality, which we find is often the case with many enterprises. Knock, on the other hand, exposes React components, React hooks, and a JavaScript client for all of our in-app features. This means that it's equally easy to get started, but you never have to sacrifice your product requirements because we provide lower-level abstractions.
In almost every case, you'll find that Knock is better suited for technical teams because of this approach to providing more flexible abstractions.
Which platform scales better for high-volume notifications?
Knock is built for enterprise scale, processing billions of notifications monthly with guaranteed delivery and idempotency. Our infrastructure provides horizontal scaling, message queuing, and delivery guarantees that platform teams require. We serve companies from startups to enterprises with thousands of employees.
Which platform provides better developer experience and documentation?
Knock is consistently praised for a superior developer experience, with comprehensive documentation, TypeScript support, and modern SDKs. Our React components and clean APIs enable developers to build faster while maintaining code quality. Developers particularly value our debugging tools and clear error handling.
What's the difference in pricing and cost predictability?
Both Knock and SuprSend offer transparent, usage-based pricing that scales with your business. Knock's pricing tiers make it accessible for startups and growing companies, with volume discounts for larger enterprise organizations. All plans include unlimited data ingestion and unlimited channels with no onboarding or service fees, and overages are only incurred by volume of sent messages. See more pricing information here.
Which platform is easier to implement?
Knock is designed for rapid implementation by developers, with most teams shipping notifications within hours by using our React components and SDKs. Knock customers report implementing complete notification systems in days rather than months. Using the Knock Management API, CLI, and MCP server, product teams can automate their work using AI tools like Cursor or Claude Code to create notification features. Currently, SuprSend does not have the same capability and lacks an API to manage workflows, templates, or layouts.
How long does migration from SuprSend to Knock take?
Most engineering teams migrate from SuprSend to Knock within 2-4 weeks, depending on notification complexity. Knock's responsive support team help accelerate the process. The investment pays off quickly through improved developer productivity and reduced maintenance.
Migrate from SuprSend to Knock
Bring your workflows, templates, and notification logic to Knock with a more flexible, open infrastructure. Reduce vendor lock-in and gain full control with developer-first workflows.