Knock vs. OneSignal
Purpose-built for developers, ready for your whole team
Modern engineering teams choose Knock to ship dynamic, cross-channel product notifications and in-app messaging that drives engagement, growth, and retention.
Top reasons teams choose Knock over OneSignal
Learn why companies reach for Knock when looking for OneSignal alternatives.
More than push
Send email, SMS, in-app, Slack, Microsoft Teams, and WhatsApp on the same workflows as push. One preference center covers every channel.
Best-in-class observability
Knock provides full logs and an end-to-end debugger so you can understand what happened, from API request to workflow run to notification sent.
Infrastructure as code
Multiple environments, git-style commits, and schema validation on workflow triggers catch errors before they reach users. A Management API, CLI, and MCP server meet developers where and how they work.
Built for agents
Call the Knock MCP server, CLI, and Management API from Claude, Cursor, or the terminal. Agents create workflows, update templates, and read message logs through the same APIs your app uses.
In-app messaging in your UI
Ship banners, modals, and feeds with your own components. Guides sit next to workflows, so product messages and notifications share preferences and delivery logs.
Built for scale and resiliency
Knock is trusted to power billions of notifications in production for world-class, enterprise organizations like Vercel, Webflow, and Zapier.
Ship messaging without limits.
Use Knock's notification primitives to build any messaging experience you like, without compromising on design, performance, or user experience.
The New user onboarding workflow in the builder, at Collab.io. An agent step is dragged in from Add a step under the new-user-signup trigger and its prompt is typed: Claude Sonnet 5 writes a welcome line for the recipient that fits their role, into a welcome_line response property. The welcome email greets the recipient by first name, then uses that line. After a 3 day delay, a branch on Created a project? sends a Day 3 tips email to people who have not created one yet and an in-app feed message to everyone else.
Trigger smart automations that send messages across any channel.
email / in-app / push / SMS / chat
Bring your application's data into Knock.
Connect warehouse, CDP, and application data to Knock, model it with custom objects, and trigger workflows directly from API calls.
Product usage from the Knock SDKs, traits from a CDP such as PostHog, Segment, or Amplitude, account data synced by Hightouch from a warehouse such as Snowflake, Databricks, or BigQuery, and billing data from Stripe flow into one user model in Knock as user properties.
A dynamic audience updates as those properties change, and a user entering the audience triggers a workflow.
Knock vs. OneSignal feature comparison
| Feature | Knock | OneSignal |
|---|---|---|
| Workflows and templates | ||
| Template editor | Yes, visual and code editors with layouts and partials | Yes, dashboard templates for push, email, and SMS |
| Branching and send windows | Yes, branch steps, delays, and send windows | Yes, journeys with wait and branch steps |
| Batching and digests | Yes, on any channel | No |
| HTTP fetch steps | Yes, fetch data mid-workflow | No |
| Channels and preferences | ||
| In-app feeds and inboxes | Yes, with React components, hooks, and a JavaScript client | No |
| Slack and Microsoft Teams | Yes | No |
| Cross-channel preferences | Yes, channel and category preferences, including per tenant | Yes, subscription categories |
| Multi-tenancy | Yes, tenants for feeds, branding, and preferences | No |
| Developer platform | ||
| Separate environments | Yes, development, staging, and production environments | No |
| Observability | Yes, API logs and per-message debugging | Yes, delivery stats |
| Version control | Yes, commit and promote workflow and template changes | No |
| CLI, Management API, and MCP server | Yes | No |
Frequently asked questions
Knock is developer-first messaging infrastructure that provides APIs and SDKs for engineering teams to build custom notification systems. OneSignal is a push notification platform designed primarily for mobile and web push notifications.
Knock supports product, growth, and engineering-owned messaging driven by events across multiple channels, while OneSignal focuses primarily on push notifications with limited cross-channel orchestration.
While OneSignal excels at push notifications, it's primarily built for mobile push use cases. Developers often find OneSignal's workflow builder limiting for complex notification logic across multiple channels, whereas Knock provides granular, programmatic control through APIs and event-driven workflows designed specifically for transactional product and customer messaging use cases. Knock's flexible preference model also allows for deeper customization than OneSignal's subscription-based approach.
Yes, Knock provides robust push notification support for both iOS and Android platforms. Unlike OneSignal, Knock also provides native in-app messaging components, email, SMS, and integrations with chat apps like Slack and Microsoft Teams, enabling true cross-channel notification orchestration.
Knock is built as infrastructure to handle billions of notifications with guaranteed delivery and idempotency. While OneSignal can handle large volumes, Knock's infrastructure approach gives engineering teams more control over delivery guarantees and message queuing.
Knock typically offers more cost-effective pricing for teams building holistic messaging systems. Knock provides transparent usage-based pricing starting at $0 for the first 10,000 notifications, making 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.
Most engineering teams migrate from OneSignal to Knock in 2 to 4 weeks, depending on how many push templates and workflows they run. Knock's support team helps with the move. Push, email, SMS, and in-app can move in phases.