Knock vs. OneSignal
Cross-channel messaging that goes beyond push + in-app
Modern product 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.
Agentic 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.
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.
Native in-app messaging
Show in-app banners, modals, and cards that use your own UI components. Guides share audiences and analytics with broadcasts and workflows, so in-app nudges can be coordinated with other messaging in one system.
Advanced sending controls
Apply batching, digests, throttling, and idempotency to lifecycle messaging and product notifications. Send timely messaging without fear of notification overload. No custom logic needed.
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.
Usage-based pricing
Connect providers you already use, such as Amazon SES and Twilio, and only pay for the messages you send. Every plan gives you unlimited contacts, team members, workflows, and channels on every plan, with no hidden costs.
Ship coordinated, cross-channel messaging
Coordinate in-app and out-of-app flows that reach the right users at the right moments. Send dynamic, on-brand messages across email, in-app, push, SMS, and chat.
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
Unify product, CDP, and warehouse data
Sync data and events from your product, CDP, warehouse, and connected tools to build dynamic audiences and trigger messaging based on any attribute or signal.
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 |
Compare push API benchmarks
See real-time performance, reliability, and uptime benchmarks for top push notification providers, powered by proprietary data from millions of notifications sent through Knock.
| Provider | Message volume | Median response time | Error rate | Growth |
|---|---|---|---|---|
 | 100M–500M | 62ms | 0.00% | 3rd |
 | 25M–100M | 72ms | 0.01% | 2nd |
 | 25M–100M | 103ms | 0.02% | 1st |
 | <1M | 210ms | 0.01% | 4th |
Teams that evaluated OneSignal and chose Knock
Teams pick Knock for one platform across channels beyond push, a fast implementation, and stateful in-app feeds with batching.
EdApp evaluated OneSignal and chose Knock
EdApp rated Knock, Courier, and OneSignal against a seven page evaluation document. Knock received the highest number of fully compliant marks, and the proof of concept took a couple of hours.
“It took longer to justify the buy decision than it did to implement Knock.”
Dave Chalmers, Head of Product results
- 2x increase in course completion rates
- 41% increase in course open rates
- In production in less than a week
VendorPM looked at tools such as OneSignal and chose Knock
VendorPM looked at marketing automation tools such as OneSignal and Airship, but they didn't solve for batching and per-user in-app feeds. Knock had support for both out of the box.
“The ease of implementation definitely exceeded our expectations. Everything related to creating workflows and mapping our model into Knock was a breeze.”
Brian Quach, Full Stack Developer results
- At least a month of development time saved, by the team's estimate
- First workflows set up in a day
Migrate from OneSignal to Knock with a prompt
Move the messages you send from OneSignal into Knock. Knock agents help you connect channels, import your data, rebuild resources, and test your setup.
Connect your channels
Create a channel for each provider you send through. Add OneSignal as a push channel to keep it for delivery, or connect APNs and Firebase Cloud Messaging directly. Add email, SMS, chat, and in-app channels in the same place.
Import your data
Bulk identify users with their properties, preferences, and channel data, and set up tenants so feeds and preferences can be scoped to each account. Use the same IDs you set as OneSignal external IDs if you keep OneSignal for delivery. You can also sync users, tenants, and source events from your warehouse.
Rebuild resources
Ask the Knock agent to migrate OneSignal message templates, recreate active journeys as Knock workflows, and to map preference categories.
Test, then switch traffic
The Knock agent tests workflows in a development environment and checks each run in the workflow debugger. When ready, promote them to production and turn off the matching OneSignal sends.
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.
OneSignal fits teams who need to send push campaigns to mobile and web subscribers, with segmentation and A/B testing.
Choose Knock when push notifications are part of your product and you want to orchestrate all of your messaging together: event-driven workflows across push, email, SMS, in-app feeds, Slack, and Microsoft Teams, with batching, per-user preferences, tenants, and separate environments. If you want to keep OneSignal for push delivery, you can connect it to Knock as a push channel.
Both. Your backend triggers workflows from API calls, and Knock runs the steps, including batches, delays, branches, fetch steps, and channel steps for push, email, SMS, in-app, Slack, and Microsoft Teams. OneSignal offers a REST API for sends and journeys for automated campaigns in its dashboard.
Knock workflows are versioned with commits and can be promoted across environments. You can manage them from the dashboard, the CLI, the Management API, or the MCP server.
Yes. Knock has SDKs for iOS, Android, Flutter, React Native, and Expo. They register device tokens for push and render in-app feeds inside your app, so push and in-app share one user, one set of preferences, and one message log.
Yes, Knock supports OneSignal as a push channel. Add your OneSignal app ID and API key, and Knock passes your Knock user ID to OneSignal as the external ID. You author push templates in Knock, and OneSignal delivers them. Player ID mode also works, though OneSignal has deprecated player IDs.
OneSignal's free plan caps mobile push at 1,000 monthly active users (MAU), and its Growth plan starts at $19/mo, with usage-based charges on top.
Knock prices by the number of messages sent, not by subscribers. The Free plan includes up to 10,000 messages a month, and the Starter plan ($250/month) includes 50,000 messages, then $0.005 per additional message. Every plan includes unlimited workflows, in-app guides, delivery channels, and stored user profiles.
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.