Socket.io and Firebase are both tools used for building real-time applications like chat, dashboards and live streaming, but they have different approaches.
In this blog, we will dive deep into the different aspects of socket.io and firebase, and help you understand which of these best fits your needs if you are trying to build a real-time chat application.
Socket.io: A quick overview
Socket.io is a JavaScript library that enables low-latency, bidirectional and event-based communication between a client and a server. Socket.IO is built on top of WebSockets to address its limitations and provides additional features like long polling and automatic reconnection.
Long polling ensures that no messages are missed by the client and continuously checks for new ones in the server. Automatic connection ensures that there is an automatic attempt of re-connection when the system fails or disconnect.

Socket.io is commonly used to build
01.
Chat Applications
02.
Real-time collaborative tools
03.
Live Streaming and broadcasting
04.
Real-time notifications
05.
Real-time analytics and dashboards
Advantages of using socket.io
Complete control over the implementation
Flexible and can be tailored to specific needs
No dependency on third-party services
Drawbacks of using socket.io
Requires significant development effort and expertise
Scalability and maintenance can be complex and resource-intensive
Longer development time compared to using third-party services
When to use socket.io
You have an existing backend infrastructure and you're already comfortable with Node.js. Socket.io integrates well with existing Node.js servers, allowing for a more tailored approach.
You are looking specifically for a WebSocket-based library to power bidirectional, event-based real time communication for your app.
Cost is a major concern. Socket.io is open-source and free to use, although you'll need to manage your own server infrastructure.
Firebase: A quick overview

Firebase is a Backend as a Service (BaaS) platform from Google that helps developers build, test, release, and monitor web and mobile apps for end-users. It provides a suite of features that streamline the development process, including:
Realtime database - At its core, Firebase is a cloud service that allows you to store data related to your application and service. Firebase offers two different non-relational database options: the Firebase Realtime Database and Cloud Firestore.
App analytics - Firebase includes a dashboard for visualizing your app’s activity, allowing you to make critical business decisions based on this data.
Cloud storage - Secure storage for various file types, accessible from your application.
Cloud functions - Serverless functions that execute code in response to events triggered in your app.
Real time Messaging - Both Firebase Realtime Database and Cloud Firestore can push real time updates to client devices following any changes to the database. Additionally, Firebase Cloud Messaging allows you to send native push notifications and notification messages across platforms (iOS, Android, web).
Chat specific firebase products
Firebase doesn't offer a single specific product solely for building chat applications, but it provides a suite of tools that work together to create a robust chat experience.
The Realtime database and cloud firestore are NoSQL databases that store and synchronize chat messages in real-time, allowing users to see messages instantly. The Realtime Database is ideal for simpler chat applications with frequent updates due to its low latency, while Cloud Firestore offers more flexibility and scalability for complex chat features and larger user bases.
Firebase authentication allows users to sign in securely using various methods like email/password, social media logins, or phone numbers, ensuring only authorized users can participate in chats.
Cloud functions can be used to implement functionalities like sending push notifications when a new message arrives or performing spam filtering on messages.
Additionally, Firebase cloud messaging enables you to send push notifications to users' devices even when the chat app is not running in the foreground, helping to notify users about new messages and keep them engaged in the chat.
Advantages of using firebase
Quick setup and integration with various Firebase services
Real-time synchronization is handled automatically
Scalable infrastructure managed by Google
Disadvantages of using firebase
Less flexibility compared to low-level socket implementations
Costs can grow with increased usage
Some limitations on data querying and complex transactions
When to use firebase
You’re looking for an all-in-one app development solution that includes diverse features like data storage, hosting, real time messaging, and authentication.
You don't need extensive customization as Firebase provides a good set of basic functionalities, but for highly specific needs, it might be less flexible.
Cost is a moderate concern. Firebase's pay-as-you-go model is cost-effective for most applications, but extremely high-traffic apps might see significant costs.
CometChat: A better alternative to Socket.io & Firebase
CometChat is a dedicated chat infrastructure provider designed to simplify the process of integrating chat functionality into your applications.
In addition to essential chat and calling features, CometChat supports various messaging formats like embedded forms and cards, location previews and file previews. These messages enhance engagement and make your chat app a critical part of business operations, nudging users to take action and be hooked to your app.
Here’s why CometChat stands out compared to using sockets or Firebase for building a chat application:
1. Purpose-built for chat:
Unlike sockets and Firebase, CometChat is specifically tailored for developers aiming to integrate chat functionality. Our SDKs and pre-built UI components along with comprehensive documentation and sample apps, significantly reduce the time and effort required to build a chat application.
2. Out of the box features
Quickly build a WhatsApp-like chat interface with out-of-the-box features such as read receipts, typing indicators, and file sharing. This allows for rapid development and deployment, enabling developers to focus on their core application functionalities.
3. Best in class UI kits
CometChat offers pre-built UI kits for frameworks like React, React Native, iOS, Android, Flutter, Angular and Vue. Pre-built UI components and embedded business logic, makes it easy to integrate and launch your chat product quickly.
4. Scalability and reliability
CometChat leverages a global server network, ensuring reliable, low latency and scalable chat services. This eliminates the need for developers to set up and manage servers, reducing both infrastructure costs and complexity. Our platform is designed to handle high traffic with 99.999% uptime, providing a seamless experience for users around the world.
5. Reduced operational overhead
By using CometChat, developers can bypass the need for an expensive DevOps team to maintain and run chat infrastructure. We handle all server maintenance, updates, and scaling, allowing developers to focus on enhancing their application’s features and user experience.
6. Integrated text, voice, and video
All under one roof. There's no need to engage with multiple vendors or navigate various dashboards, as CometChat provides a single solution for all real-time communication needs.
7. Unmatched Support
White-glove implementation assistance and global support coverage guarantee a smooth onboarding and ongoing success.
8. Go beyond core chat
Interactive messages drive user engagement and business operations. Schedule consultations, collect leads, conduct surveys, and more within the chat interface, transforming chat from a communication tool into a business powerhouse.
CometChat is trusted by thousands of customers globally, from small startups to big enterprises, due to its ease of use, robust features, and reliability.
Direct comparison of socket io vs Firebase & CometChat
Feature | Socket.io | Firebase | CometChat |
---|---|---|---|
Development effort
| Higher development effort needed to build a full-fledged chat app from scratch. Requires implementing server, client, real-time logic, etc.
| Relatively low effort to get started, with managed services and SDKs. However, building complex chat features may require more work.
| Low effort to integrate chat features with SDKs and UI kits. Abstracts away most of the backend complexity.
|
Core chat features
| Flexible to build any chat feature, but requires more development. No built-in features.
| Realtime Database provides real-time updates, but lacks many advanced chat features out-of-the-box. More development is needed.
| Provides a comprehensive set of chat features natively. One-on-one chat, groups, typing indicators, read receipts, online presence, etc. Easy to integrate with UI kits.
|
Moderation
| No built-in moderation features. Developers need to build it separately.
| No native moderation. Developers need to implement it.
| Offers advanced moderation features like profanity filter, message history, block/ban users, etc. Uses AI for moderation.
|
Notifications
| No built-in notification system. Developers need to implement it.
| Offers push notifications through Firebase Cloud Messaging (FCM). Requires some setup.
| Provides push notifications out-of-the-box. Supports FCM, APNS, custom notification payloads.
|
Analytics and insights
| No built-in analytics. Developers need to implement tracking and analytics separately.
| Offers Firebase Analytics for general app analytics. No chat-specific insights.
| CometChat offers comprehensive data tracking and analysis by including conversation and engagement analytics, user-level data tracking, and AI-powered insights.
|
Pricing
| Open source, no direct costs. Hosting and infrastructure costs.
| Free tier with usage limits. Paid tiers based on usage.
| Free build plan for up to 25 MAUs. Paid plans start at $119/month.
Voice calling is charged at $0.001 /user minute
Video calling is charged at $0.003 /user minute.
|
AI features
| No native AI capabilities. Developers need to build it separately.
| No built-in AI features. Developers need to integrate external AI services
| AI-powered features like sentiment analysis, intent detection, smart replies, etc. Helps build AI chatbots.
|
In summary, Firebase is a good choice for simple chat apps with low development effort. Socket.IO provides maximum flexibility but requires more development work. CometChat offers the best balance of low integration effort, comprehensive features, moderation, analytics and AI capabilities out-of-the-box.

Aarathy Sundaresan
Content Marketer , CometChat