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Firebase Cloud Messaging vs Socket.IO

Discover how Firebase Cloud Messaging compares to Socket.IO, and understand which is right for your use case, based on dimensions such as core features, pricing, reliability, and scalability.

Firebase Cloud Messaging

What is Firebase Cloud Messaging?

Firebase Cloud Messaging (FCM) is a free cross-platform messaging service for sending and receiving messages and notifications across platforms like iOS, Android, and the web via cloud-based infrastructure. It supports both upstream and downstream messaging.

Socket.IO logo

What is Socket.IO?

Socket.IO is a library created in 2010 that provides realtime, bi-directional communication between clients and servers. It allows the management of connections, sending and receiving messages, and more. Built on top of the WebSocket protocol, it provides additional capabilities compared to raw WebSockets. WebTransport (a WebSocket alternative) is also supported.

Compare Firebase Cloud Messaging and Socket.IO

Let’s compare Firebase Cloud Messaging and Socket.IO, 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 Firebase Cloud Messaging and Socket.IO. The content was last updated on 30 Oct 2024 for Firebase Cloud Messaging and on 26 Sept 2024 for Socket.IO. 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 If you do find anything incorrect or out of date, then please contact us.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.

Firebase Cloud Messaging

Partial

Firebase Cloud Messaging (FCM) is not a Pub/Sub service. However, you can connect it with Google Cloud Pub/Sub to create more advanced messaging patterns, including asynchronous messaging and scaling.

Read more
Socket.IO

No

Need to rely on a third party - e.g. use a Redis adapter to broadcast events to clients through the Redis pub/sub mechanism.

Read more
Chat capabilities

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

Firebase Cloud Messaging

Partial

Firebase doesn’t offer a dedicated messaging solution. However, you can build these features using Firebase services such as Realtime Database, Firestore, and Firebase Storage.

Socket.IO

Partial

As it's a library, you need to create the chat capabilities yourself. But this can be done using Socket.IO.

Collaboration capabilities

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

Firebase Cloud Messaging

Yes

FCM does not have built-in collaboration capabilities like live cursors, member location, avatar stacks, and component locking. However, you can build these using Firebase Realtime Database or Firestore.

Socket.IO

Partial

As it's a library, you need to implement collaboration capabilities yourself. But you can do this using Socket.IO itself.

State sync capabilities

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

Firebase Cloud Messaging

Partial

FCM does not offer state sync capabilities on its own. You can achieve this by connecting it with Firebase Realtime Database or Firestore.

Read more
Socket.IO

No

The library does not support this. You would need to create a bespoke state sync capability or integrate a third party library to get state synchronisation.

Presence

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

Firebase Cloud Messaging

Partial

FCM does not provide presence capabilities on its own. To incorporate presence, integrate with Firebase Realtime Database, which natively supports presence.

Read more
Socket.IO

Partial

It is the duty of your application to link a Socket.IO connection to a user account.

Read more
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.

Firebase Cloud Messaging

Partial

FCM does not have built-in support for occupancy tracking. However, occupancy tracking functionality can be built on top of the Firebase Realtime Database.

Socket.IO

Partial

Rooms are available. It is possible to query for rooms and SIDs.

See more
Message interactions

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

Firebase Cloud Messaging

Partial

Message interactions are not natively supported in FCM. However, you can programmatically build interactions on top of Firebase's Realtime Database.

Socket.IO

Partial

You would need to build the message interaction functionality yourself on top of Socket.IO.

Learn more
Message history

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

Firebase Cloud Messaging

Yes

FCM provides message delivery reports that can be viewed in the Firebase console.

:cta[Read more(https://firebase.google.com/support/guides/cloud-audit-logging/firebase-cloud-messaging#permission-type):

Socket.IO

No

The Socket.IO server does not store messages. Your application has to persist messages somewhere for the clients that are not currently connected.

Learn more
Push notifications

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

Firebase Cloud Messaging

Yes

Socket.IO

No

Socket.IO not support Push notifications. You would need to build this capability yourself and/or use another library.

Learn more
Message delta compression

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

Firebase Cloud Messaging

No

Socket.IO

No

Programmatic management

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

Firebase Cloud Messaging

Yes

FCM offers programmatic management through its APIs.

Socket.IO

Yes

The Socket.IO server is initialised in code. It is possible to configure the socket.IO server's configuration in code as well.

Learn more
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.

Firebase Cloud Messaging

Yes

FCM is free to use.

Socket.IO

Yes

Open Source framework that uses the MIT license.

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.

Firebase Cloud Messaging

FCM is free to use.

Socket.IO

Free and open-source.

Integrations & interoperability
SDKs

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

Firebase Cloud Messaging
  • iOS
  • Android
  • Web
  • Unity
Socket.IO

Client and Server APIs only.

  • C++
  • Swift
  • Java
  • Javascript
  • Typescript
  • Node.js
  • Python
  • Golang
  • Rust
  • Dart
  • .NET
  • Kotlin
Supported realtime protocols

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

Firebase Cloud Messaging
  • WebSockets
Socket.IO
  • WebSocket
  • WebTransport
  • HTTP
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.

Firebase Cloud Messaging
  • Cloud Functions for Firebase
Socket.IO

No

It is not possible to trigger serverless functions with Socket.IO on it's own.

See this Reddit post for more info
Streaming & queueing

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

Firebase Cloud Messaging

No

Socket.IO

No

Socket.IO does not offer native queues and streaming.

Observability services

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

Firebase Cloud Messaging

Partial

FCM does not directly offer built-in observability services, but you can integrate with Firebase Performance Monitoring to monitor your application performance based on location, device, or version.

Socket.IO

Yes

The Socket.IO admin UI can be used to have an overview of the state of your Socket.IO deployment.

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.

Firebase Cloud Messaging

No

Socket.IO

No

Quality of Service
Scalability

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

Firebase Cloud Messaging

According to FCM, FCM can scale to over 115 billion notifications to more than 400 million users globally. At a recorded peak time, FCM has handled 46 million queries per second (QPS) from its average baseline of 18 million QPS.

Read more
Socket.IO

No published metrics. Socket.IO servers don’t communicate between them, so you need a way to route events to all clients, even if they are connected to different servers. This is made possible by using adapters, of which the Redis adapter seems to be the most popular choice.

Guaranteed message delivery

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

Firebase Cloud Messaging

No

FCM does not guarantee message delivery without loss or duplication. It operates on a "best effort" model.

Socket.IO

Partial

By default, Socket.IO provides an "at most once" guarantee of delivery. From the client side, you can achieve an at least once guarantee with acknowledgements and timeouts.

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.

Firebase Cloud Messaging

No

Socket.IO

Yes

Socket.IO guarantees ordering, no matter which low-level transport is used.

Read more
Exactly-once message delivery

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

Firebase Cloud Messaging

No

Socket.IO

No

At least once or at most once only.

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.

Firebase Cloud Messaging

FCM uptime SLA is unclear. However, Firebase's SLA has a monthly uptime SLA of at least 99.95%.

Read more
Socket.IO

No

It is a library, not a platform.

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.

Firebase Cloud Messaging

Yes

FCM benefits from Google's global edge network.

Socket.IO

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.

Firebase Cloud Messaging

No

Socket.IO

No

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.

Firebase Cloud Messaging

Yes

FCM's distributed architecture and implementation of load balancing strategies ensure the re-routing of requests and distribution of message traffic evenly across servers, preventing single points of failure and congestion.

Socket.IO

No

As Socket.IO is a library, the implementation of it dictates points of failure and congestion.

Latency

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

Firebase Cloud Messaging

Unknown.

Socket.IO

Unknown

Security & compliance
API key authentication

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

Firebase Cloud Messaging

Yes

Socket.IO

No

Token-based authentication

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

Firebase Cloud Messaging

Yes

Socket.IO

No

No native Token based auth. It is possible to use middlewares.

Single Sign-On (SSO) authentication

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

Firebase Cloud Messaging

No

Socket.IO

No

No native SSO. It is possible to use middlewares.

Rules for permissions and operations

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

Firebase Cloud Messaging

Partial

FCM does not implement rules for permissions and operations. Firebase's security features manage permissions and security.

Read more
Socket.IO

No

End-to-end encryption

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

Firebase Cloud Messaging

No

Socket.IO

No

Encryption at rest

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

Firebase Cloud Messaging
Socket.IO

No

Compliance

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

Firebase Cloud Messaging
  • SOC1
  • SOC2
  • SOC3
  • ISO 27001
  • GDPR
  • CCPA
Socket.IO

None.

Alternatives to Firebase Cloud Messaging and Socket.IO

While both Firebase Cloud Messaging and Socket.IO 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 Firebase Cloud Messaging

Amazon-sns logo

Amazon SNS is an AWS service for designed to distribute notifications from applications to subscribers via SMS, email, etc.

Pusher logo

Pusher is a first-generation pub/sub messaging service that provides bi-directional hosted APIs for adding realtime features to applications.

tech provider image

OneSignal is a customer engagement platform that offers push notifications, messages, and email sends for businesses to manage communication with their users.

See more alternatives to Firebase Cloud Messaging

Alternatives to Socket.IO

Azure-signalr-service logo

Azure SignalR is an Azure-hosted, fully managed realtime framework built on top of an open-source software library for Microsoft ASP.NET.

Firebase logo

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

Pubnub logo

PubNub is a developer API platform that powers the realtime infrastructure in apps to build engaging Virtual Spaces where online communities can connect.

See more alternatives to Socket.IO

Discover how Firebase Cloud Messaging and Socket.IO stack up against Ably

Ably is the definitive realtime experience platform of the internet. See how we compare to Firebase Cloud Messaging and Socket.IO 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