The 6 best notification infrastructure services

Trusted notification infrastructure is crucial for engaging users and delivering timely information.

Whether you're sending transactional emails, push notifications, SMS alerts, or in-app messages, having a reliable notification infrastructure is essential for modern applications because it unifies the management and delivery of notifications across all channels.

In this post, well explore different notification infrastructure solutions for developers in terms of features, pricing, and developer experience.

The best notification services

Here are the top platforms we have evaluated:

Knock
Novu
Courier
SuprSend
Fyno
MoEngage

What makes a great notification service?

Before exploring findings on each platform, here is a list of the features we examined:

Cross-channel support: a proper notification solution should support all channels, including email, push, SMS, in-app, etc.
Developer experience and API design: is the API well-designed and include SDKs for multiple languages?
Template management capabilities: templating communication helps with consistency across all channels.
Customization options: proper solutions should include a variety of customization options to help you create the perfect notification for your users.
Analytics and observability: how much data is available to track and monitor the performance of your notifications?
Pricing and scalability: does the solution include a free tier and does pricing scale predictably and fairly as your needs grow?
Reliability and deliverability: can you trust the solution to deliver your notifications reliably and on time?

1. Knock

Developer-focused notification infrastructure

Knock positions itself as a comprehensive notification system designed specifically for developers building production-grade applications. It offers a unified API for managing notifications across multiple channels at scale to send notifications in the time zone preferred by your users.

Supported channels

Email
In-app
SMS
Chat (Slack, Teams, Discord, etc.)
Push (Apple Push, Firebase FCM, Expo, etc.)
Custom Data platforms (Segment, Rudderstack, etc.)

Knock features

Workflow engine for complex notification logic
Collaborative template management
SDKs to support multiple languages
Notification batching and throttling
Comprehensive analytics and observability tools
Tenant isolation for multi-tenant applications
Integration with popular email providers

Pros

Well-designed, developer-friendly API with SDKs for multiple languages
Strong focus on workflow design and complex notification logic
Excellent observability tools to monitor delivery and engagement
Built for scale with enterprise-grade features
Flexible template management system with visual designer for non-technical users
GDPR and HIPAA compliance

Cons

No lower entry plan beyond free plan (relative to other providers) for hobby projects just getting off the ground.

Pricing

Knock provides a free tier for development and early-stage projects. Paid plans are based on notification volume and feature requirements, with custom pricing options for larger enterprise needs.

Free: 10k notifications per month
Starter ($250/mo): 50k notifications per month
Enterprise: Custom pricing

View the Knock pricing page for more details.

Knock Resend Integration

Learn how to send transactional emails through your Resend account with Knock.

https://docs.knock.app/integrations/email/resend

2. Novu

Open-source notification infrastructure

Novu takes a different approach as an open-source notification infrastructure, allowing developers to self-host if desired. It aims to provide a complete solution for managing multi-channel notifications.

Supported channels

Email
In-app
Push (Apple Push, Firebase FCM, Expo, etc.)
SMS
Chat (Slack, Teams, Discord, etc.)

Novu features

Open-source core with MIT license
Visual template editor
Subscriber preference management
Digest and delay capabilities
Notification center UI components
Webhook support

Pros

Open-source with ability to self-host
Active community and regular updates
Ready-to-use notification center components
Good integration options with various providers
More affordable pricing for startups

Cons

Less mature than some commercial alternatives
Fewer enterprise features out of the box
Self-hosting requires additional maintenance

Pricing

Novu offers a free tier with limited usage. Their cloud offering has tiered pricing based on notification volume and features and scales predictably. Self-hosting is available for those who want to run Novu on their own infrastructure.

Free: 10k notifications per month
Starter ($30/mo): 30k notifications per month
Team ($250/mo): 250k notifications per month
Enterprise: Custom pricing

View the Novu pricing page for more details.

Novu Resend Integration

Learn how to send transactional emails through your Resend account with Novu.

https://docs.novu.co/channels-and-providers/email/resend

3. Courier

Notification design and delivery platform

Courier focuses on providing a blend of design tools and delivery infrastructure for notifications. It emphasizes the visual design aspect alongside developer tools and includes a drag-and-drop editor for creating notifications.

Supported channels

Email
SMS
Push (Apple Push, Firebase FCM, Expo, etc.)
In-app
Chat (Slack, Teams, Discord, etc.)
Custom Data platforms (Segment, Rudderstack, etc.)

Courier features

Visual notification designer
Brand controls and templates
Preference center
A/B testing capabilities
Event tracking and analytics
Provider failover and routing

Pros

Strong visual design tools for non-developers
Good balance of developer and designer features
Comprehensive provider integrations
Solid analytics capabilities
Provider failover for improved reliability

Cons

API might be less developer-focused compared to Knock
Some advanced features limited to higher tiers
Workflow capabilities not as robust for complex scenarios

Pricing

Courier provides a free tier for development and small projects. Paid plans are based on notifications sent and scale as you send. You only pay for what you use.

Free: 10k notifications per month
Pro: $0.0005/notification
Enterprise: Custom pricing

View the Courier pricing page for more details.

Courier Resend Integration

Learn how to send transactional emails through your Resend account with Courier.

https://www.courier.com/docs/external-integrations/email/resend

4. SuprSend

Notification orchestration platform

SuprSend is built to help teams manage notification logic, channel preferences, and template design in a unified system. It provides an orchestration layer that decouples notification infrastructure from application logic, with tooling focused on speed, observability, and channel abstraction.

Supported channels

Email
SMS
Push (mobile and web)
In-app
Chat (Slack, Microsoft Teams, WhatsApp)

SuprSend features

Event-driven notification workflow engine
Preference management and user channel routing
Template management with support for variables and logic
Real-time observability and delivery status tracking
SDKs for backend frameworks (Node.js, Python, Java, Go, etc.)
Multi-channel orchestration with built-in retry and fallback
Role-based access control for teams

Pros

Quick setup with a clean API and documentation
Built-in user preference center and channel routing logic
Strong delivery visibility and error tracking out-of-the-box

Cons

Fewer out-of-the-box integrations than competitors like Fyno
Still maturing ecosystem for frontend components and in-app UX
Limited enterprise feature depth compared to other platforms

Pricing

SuprSend offers flexible usage-based pricing, with a free tier to support solo developers or simple apps. Paid plans scale with monthly notification volume and additional features.

Free: Up to 10,000 notifications/month
Essentials: Starting at $100/month for 50k notifications/month
Business: Starting at $250/month for 50k notifications/month, plus features like batching, digest, user preferences, and more
Enterprise: Custom pricing based on volume, infrastructure, and compliance needs

View the SuprSend pricing page for more details.

SuprSend Resend Integration

Learn how to send transactional emails through your Resend account with SuprSend.

https://docs.suprsend.com/docs/resend

5. Fyno

Notification routing and orchestration platform

Fyno positions itself as a notification infrastructure layer focused on simplifying routing and delivery across any channel or provider. It offers an abstraction layer over multiple third-party messaging services, enabling teams to build, manage, and route notifications without writing custom integrations for each provider.

Supported channels

Email
SMS
Push
In-app
Chat (Slack, WhatsApp, Microsoft Teams, Discord)
Voice (Exotel, Kaleyra)

Fyno features

Provider-agnostic routing and failover
No-code workflow builder with fallback logic
Dynamic channel preferences based on user behavior
Real-time notification delivery logs and analytics
Unified API across all providers
Support for templating and personalization
Integration with over 50 providers out-of-the-box

Pros

Integration with a wide range of providers via pre-built connectors
Intuitive UI for building and visualizing workflows without code
Built-in failover and fallback logic improve reliability across providers

Cons

Less flexibility for custom use cases compared to code-first tools
API and SDK support not as mature or language-diverse as developer-native platforms
Limited native support for tenant-specific configurations
Limited free plan and no lower entry plan relative to other providers

Pricing

Fyno offers a limited free tier for testing and development. Paid plans scale based on the number of notification executions and notified users.

Free: Up to 50,000 API requests with only 15 day access. Fyno doesn't have or plan to have a free forever plan.
Paid: Starting from $249/month for up to 200,000 notifications/month. Final pricing is determined based on the number of API requests per month, number of notified users per month, and volume discounts.

View the Fyno pricing page for more details.

6. MoEngage

Customer engagement platform with notification capabilities

MoEngage is a customer engagement platform designed for marketing and product teams to deliver personalized, cross-channel campaigns. While not a developer-first tool, it includes notification infrastructure across multiple touchpoints and capabilities for segmentation, automation, and analytics.

Supported channels

Email
Push (mobile and web)
SMS
In-app
WhatsApp (paid add-on)
Onsite (web overlays, modals, etc.)
Webhooks and connectors for custom channels

MoEngage features

Visual journey builder for multi-step campaigns
Behavioral segmentation and real-time user analytics
Dynamic content personalization and A/B testing
Campaign orchestration with goal tracking
Built-in preference management
CRM and data platform integrations (Segment, Snowflake, etc.)
Predictive analytics and AI-driven targeting

Pros

Intuitive campaign builder for marketing-led lifecycle messaging
Deep analytics and segmentation tools to personalize communication
All-in-one suite supports both engagement and data unification

Cons

Not optimized for developer-first, product-led use cases
Limited flexibility for teams looking to fully own UX or in-app delivery logic
API access and developer tooling are less mature than code-native platforms like Knock or Novu
No free plan or transparent pricing

Pricing

MoEngage doesn't offer transparent pricing on their website, alluding to custom pricing based on contacts, usage volume, and required products and features. Several capabilities are also considered custom add-ons.

MoEngage Inform: Uniform messaging infrastructure for cross-channel transactional alerts
Cross-Channel Marketing & Analytics:
- Growth: Essential solutions to help your growing teams build and retain customers.
- Enterprise: Essential solutions for multi-functional teams to create unique experiences for every customer across the globe.
MoEngage Personalize: Engage and convert website visitors with personalized web experiences.

View the MoEngage pricing page for more details.

Which notification service should you choose?

Each of these notification services has its strengths and ideal use cases:

Choose Knock if you're a developer focused on building complex, scalable notification systems with advanced workflows and need enterprise-grade reliability and observability.

Choose Novu if you prefer an open-source solution, want the option to self-host, or need a more budget-friendly option with ready-to-use UI components.

Choose Courier if you want a balance between developer tools and visual design capabilities, especially if non-technical team members will be involved in creating notifications.

Choose SuprSend if you need a developer-friendly notification platform with rapid setup, comprehensive analytics, and robust delivery guarantees across multiple channels.

Choose Fyno if you're looking for a lightweight notification service with real-time delivery tracking, customizable templates, and seamless integration with popular development frameworks.

Choose MoEngage if you want a service built for marketing and product teams, with a focus on engagement and personalization.

When making your decision, consider factors like your team's technical expertise, budget constraints, scaling needs, and how complex your notification workflows will be. Many teams start with simpler solutions and migrate to more robust platforms like Knock as their notification needs grow more sophisticated.

Conclusion

Regardless of which service you choose, implementing dedicated notification infrastructure will significantly improve your ability to communicate with users effectively across multiple channels.