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Amazon EventBridge vs AWS AppSync

Discover how Amazon EventBridge compares to AWS AppSync, and understand which is right for your use case, based on dimensions such as core features, pricing, reliability, and scalability.

What is Amazon EventBridge?

Amazon EventBridge is a serverless event bus service that enables real-time response to state changes in your applications. Using an event bus, it collects data from multiple sources, processes and routes them between other AWS services or external SaaS providers. This simplifies the building of scalable and loosely coupled systems in event-driven architectures.

Suitable for:

  • Multiple systems syncing
  • Event-driven automation
  • Data processing
  • Tasks scheduling
  • Monitoring and auditing

Not suitable for:

  • Two-way communication
  • On-premises applications
  • Legacy systems
  • Complex event processing

Pros:

  • Event archive & replay
  • Serverless architecture
  • Event replay & filtering
  • Custom event buses

Cons:

  • Vendor lock-in
  • Complex access control
  • Low throughput

What is AWS AppSync?

AWS AppSync is a fully managed service designed to streamline the process of building and deploying serverless GraphQL and pub/sub over WebSocket APIs. It enables developers to seamlessly handle and synchronize mobile app data in realtime across devices and users. Even when a mobile device is offline, AppSync permits data access and modification.

Suitable for:

  • Chat rooms
  • Collaborative apps
  • Data broadcasting
  • IoT apps
  • Apps requiring low latency

Not suitable for:

  • Where you need to use custom directives
  • Service quotas
  • Large-scale/complex projects

Pros:

  • Managed GraphQL service & pub/sub over WebSocket APIs
  • Backend management
  • Connection recovery
  • AWS service integration

Cons:

  • Complex, especially the templating engine (VTL)
  • High cost - may be more expensive than alternatives
  • Limited plug-ins
  • Single region solution

Compare Amazon EventBridge and AWS AppSync

Let’s compare Amazon EventBridge and AWS AppSync, looking at key dimensions such as their core features, pricing, integrations, QoS, performance, and security and compliance.

Disclaimer:This comparison was created based on documentation and resources freely available online about Amazon EventBridge and AWS AppSync. The content was last updated on 1 Aug 2024 for Amazon EventBridge and on 1 Aug 2024 for AWS AppSync. Be sure to double-check everything before you make any decisions. If you do find anything incorrect or out of date, then please contact us.

Core features
Pub/Sub messaging

Reduces communication code complexity, simplifying the process of building highly functional and architecturally complex realtime apps.

Amazon EventBridge

Yes

AWS AppSync
Chat capabilities

Accelerates the time to implement rich chat experiences with features such as read receipts, typing indicators, and more.

Amazon EventBridge

No

AWS AppSync

Partial

AWS AppSync can be used with other AWS products to build a chat product.

Find out how
Collaboration capabilities

Enables you to quickly integrate realtime collaborative features like live cursors, member location, avatar stacks, and component locking.

Amazon EventBridge

No

AWS AppSync

Partial

AWS AppSync provides the primitives to build basic collaborative experiences.

See example
State sync capabilities

Enables realtime data synchronization across devices and users, ensuring a cohesive and up-to-date user experience.

Amazon EventBridge

Yes

AWS AppSync

Partial

Can be built on top of AppSync, but not available out of the box.

Presence

Maintaining a view of which users are connected, and their associated metadata, enables their online status to be updated in realtime.

Amazon EventBridge

No

AWS AppSync

Partial

"AWS AppSync does not provide events related to client connections or disconnections" (see source) - but it can be built on top of it by composing multiple AWS products.

Occupancy

High-level metrics about the clients currently connected to a channel make it simple to show things such as connected user count, or display which channels are the most popular.

Amazon EventBridge

No

AWS AppSync

No

Message interactions

Enables interaction with previously-sent messages, facilitating the implementation of features like message reactions and threads.

Amazon EventBridge

No

AWS AppSync

No

Message history

Enables clients to catch up on missed messages when inactive, ensuring a user doesn’t miss any important messages.

Amazon EventBridge

Yes

AWS AppSync

Partial

Looks like you can get message history, but only in combination with other AWS services

see source
Push notifications

Cross-platform push notifications make it possible to deliver important and timely messages to users even when they’re inactive.

Amazon EventBridge

Partial

Amazon EventBridge does not support native push notifications. Notifications can be sent to communication channels by integrating with AWS Chatbot.

AWS AppSync
Message delta compression

Minimizes bandwidth and can reduce latency, particularly in scenarios where continuous updates are sent.

Amazon EventBridge

No

AWS AppSync
Programmatic management

Enables the automation of provisioning, management, and testing of service resources, simplifying integration with existing development workflows such as CI.

Amazon EventBridge

Yes

AWS AppSync

Yes

You can perform programmatic management using the AWS SDKs (Software Development Kits), AWS Command Line Interface (CLI), or infrastructure-as-code tools like AWS CloudFormation or AWS CDK (Cloud Development Kit).

Pricing
Free plan

With a free plan, you can test the service’s functionality and compatibility with your project before committing to a paid plan.

Amazon EventBridge

Yes

Free access to AWS default service events for event buses. Custom events, third-party SaaS, and cross-account events are paid.

AWS AppSync

Yes

250,000 API requests free per month for 12 months with the AWS Free Tier.

Pricing model

The pricing model should align with your project's expected load, usage patterns, and budget in order to be cost-effective and efficient.

Amazon EventBridge

Amazon EventBridge has a limited free tier and a pay-as-you-go pricing model based on the number of events published to EventBridge, the number of invocations, events replayed, and schema discovery. The cost varies based on the event type. You can read more about the pricing plan on Amazon's website.

AWS AppSync

You pay only for what you use with no minimum fees or mandatory service usage. You are billed separately for query and data modification operations, and for performing realtime updates on your data.

Read more
Integrations & interoperability
SDKs

Supporting multiple languages and platforms offers greater flexibility when building cross-platform realtime apps.

Amazon EventBridge
  • Go
  • PHP
  • Java
  • Javascript
  • .NET
  • Kotlin
  • Python
  • C++
  • Ruby
AWS AppSync
  • iOS
  • Android
  • JavaScript
See source
Supported realtime protocols

Support for multiple protocols provides the flexibility to choose a protocol that best suits your project’s requirements.

Amazon EventBridge
  • HTTPS
  • Webhooks
AWS AppSync
  • WebSockets
Serverless functions

Enables integration with third-party cloud providers by facilitating the execution of custom code against messages to perform business logic like on-the-fly translation.

Amazon EventBridge
  • AWS Lambda
AWS AppSync
  • AWS Lambda
Streaming & queueing

Provides a dependable method to reroute messages from the service to third-party streams and queues for further processing.

Amazon EventBridge

Partial

Available through Amazon SQS.

AWS AppSync

AWS AppSync doesn't directly integrate with streaming and queuing services for data ingress and egress, but you can use the following AWS services alongside AppSync to build scalable and event-driven architectures for your applications:

Ingress:

  • Amazon Kinesis Data Streams
  • Amazon SQS (Simple Queue Service)

Egress:

  • AWS Lambda
  • Amazon SNS (Simple Notification Service)
Observability services

Enables realtime monitoring and troubleshooting by offering insights into service behavior directly in your observability platform of choice.

Amazon EventBridge

Partial

Amazon EventBridge provides an integration with Amazon CloudWatch for monitoring usage and metrics.

AWS AppSync

Partial

Through AWS X-Ray native integration.

Read more
CI/CD tools

Makes it possible to provision and configure service infrastructure as part of a CI or CD pipeline, enabling repeatable and reliable deployments.

Amazon EventBridge

Yes

Supports:

  • AWS CodePipeline
  • AWS CodeBuild
  • AWS CodeDeploy
AWS AppSync

No

Quality of Service
Scalability

Scalability is vital as it ensures the service can handle increased data load or users without compromising performance.

Amazon EventBridge

No published metrics are available.

AWS AppSync

No published metrics are available. However, this works on top of serverless technology which means theoretically it should scale to millions of concurrent connection with little to no tuning from the customer.

Guaranteed message delivery

Ensures messages are never lost during transmission, even in the presence of network disruptions.

Amazon EventBridge

Yes

Amazon EventBridge promises at-least-once event delivery. It will try to deliver an event to a target for up to 24 hours.

AWS AppSync

No

Guaranteed message ordering

Maintains the sequence of messages as they were sent. This is particularly important in apps where the chronological order of messages is essential for meaningful communication.

Amazon EventBridge

No

AWS AppSync

No

Exactly-once message delivery

Guarantees that each message is processed exactly once, preventing data inconsistencies that can arise from duplicate processing or missing messages.

Amazon EventBridge

No

Amazon EventBridge does not support exactly-once delivery semantics out of the box. It ensures at least-once delivery, but does not guarantee exactly-once delivery.

AWS AppSync

No

Performance & availability
Uptime Guarantee

An uptime guarantee instills confidence in the reliability of the service and protects your business from the negative impacts of downtime.

Amazon EventBridge

99.99%.

Read more
AWS AppSync

99.95 uptime SLA

Global edge network

By bringing servers (Points of Presence, or PoP) geographically closer to the devices of end users, and routing requests to the nearest PoP, global latency is reduced to a minimum.

Amazon EventBridge

Yes

AWS AppSync

No

Multi-region data replication (message durability)

By replicating data across multiple regions, the risk of data loss or downtime is greatly mitigated since if data is lost or a server fails in one region, the information can be retrieved from another.

Amazon EventBridge

No

AWS AppSync

Partial

Single region by default - multi region deployment of AWS AppSync would require integration of Amazon DynamoDB Global Tables.

No single point of failure or congestion

Having no single point of failure means a system is resilient and can continue to operate even if one part fails. Avoiding a single point of congestion ensures messages flow efficiently across the system and avoids bottlenecks that could lead to performance issues under load.

Amazon EventBridge

Yes

AWS AppSync

Partial

Not available by default - but could be built with the integration of Amazon DynamoDB Global Tables.

Latency

Low latency is crucial for realtime apps as it ensures swift and efficient data transmissions, providing a smoother and more responsive user experience.

Amazon EventBridge

500ms global average latency

Read more
AWS AppSync

Unknown, although reports in forums suggest it is 200-500 ms.

Security & compliance
API key authentication

Simplifies the authentication code on trusted servers compared to requesting, managing, and refreshing tokens.

Amazon EventBridge

Yes

AWS AppSync
Token-based authentication

Provides a means to securely authenticate user devices against your user management system.

Amazon EventBridge

Yes

Amazon EventBridge uses the AWS STS (Security Token Service) for token-based authentication.

AWS AppSync

Yes

JWT via Amazon Cognito User Pools.

See how it works
Single Sign-On (SSO) authentication

SSO streamlines login processes, boosts security by minimizing password use, and meets compliance needs for secure data access management.

Amazon EventBridge

Yes

Amazon EventBridge supports Single Sign-On (SSO) through AWS SSO.

AWS AppSync

Yes

Can set up auth with AWS IAM, and AWS IAM can be configured with any identity source (e.g. Okta).

Learn more
Rules for permissions and operations

Provides control over which users can subscribe and publish to certain channels.

Amazon EventBridge

Yes

AWS AppSync
End-to-end encryption

Ensures that the data transmitted between the client and the API server remains confidential and secure while in transit.

Amazon EventBridge

Yes

AWS AppSync

Yes

TLS1.2 supported; TLS1.3 recommended.

Read more
Encryption at rest

Ensures data stored by the service is secure and compliant, while also mitigating the risks of a data breach.

Amazon EventBridge

Yes

AWS AppSync

Yes

Done using AWS Key Management Service keys. This ensures that data in services like AppSync is securely encrypted.

Read more
Compliance

Compliance with regulations can impact your ability to meet legal obligations in your industry.

Amazon EventBridge
  • HIPAA
  • EU GDPR
  • SOC 2 TYPE I
  • SOC 2 Type II
AWS AppSync
  • SOC
  • PCI
  • HIPAA/HIPAA BAA
  • IRAP
  • C5
  • ENS High
  • OSPAR
  • HITRUST CSF programs

Alternatives to Amazon EventBridge and AWS AppSync

While both Amazon EventBridge and AWS AppSync are worth considering as options for realtime experiences, they aren’t without their limitations. We suggest evaluating them against the following alternatives to make sure you find the right solution for your needs.

Alternatives to Amazon EventBridge

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TriggerMesh is a free and open-source AWS EventBridge alternative.

Azure Event Grid is a Pub/Sub message routing service for creating event-driven architectures using MQTT and HTTP protocols.

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Confluent Kafka is a scalable and distributed streaming platform that enables real-time data communications.

See more alternatives to Amazon EventBridge

Alternatives to AWS AppSync

Amazon API Gateway is a service for building, deploying, and managing APIs.

Firebase Realtime Database is a cloud-hosted database by Google, allowing developers to build realtime applications for web and mobile.

tech provider image

Apollo GraphQL is a scalable platform that unifies all your data sources to one GraphQL API.

See more alternatives to AWS AppSync

Discover how Amazon EventBridge and AWS AppSync stack up against Ably

Ably is the definitive realtime experience platform of the internet. See how we compare to Amazon EventBridge and AWS AppSync on key dimensions such as core features, pricing, integrations, QoS, performance, and security and compliance.

Try Ably for free to discover the benefits for yourself

Ably has built reliable realtime infrastructure so you don’t have to. On our free plan you benefit from:

  • 6M monthly messages
  • 200 concurrent channels
  • 200 concurrent connections