Ably vs Firebase

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

What is Ably?

Ably is a realtime experience platform that provides APIs and SDKs to power realtime functionality - with no realtime infrastructure to build and maintain. Our application building blocks and integrations enable developers to quickly create live experiences from live chat and data broadcast, to collaborative UXs and notifications.

What is Firebase?

Firebase is a cloud-native backend by Google that allows developers to build mobile and web applications. Firebase services include Firebase Realtime data, Firestore database, authentication, and Firebase Cloud Messaging (FCM), among others.

Compare Ably and Firebase

Let’s compare Ably and Firebase, looking at key dimensions such as their core features, pricing, integrations & interoperability, quality of service, performance & availability and security & compliance.

Disclaimer: This comparison was created based on documentation and resources freely available online about Ably and Firebase. The content was last updated on 30 Apr 2025 for Ably and on 16 May 2025 for Firebase. Be sure to double-check everything before you make any decisions. If you do find anything incorrect or out of date, then please let us know.

Hear from companies gaining their realtime advantage with Ably

“

The core infrastructure for delivering live sports data to our customers is Ably. We sleep easier at night knowing it can be relied on for consistent low latency and message integrity at scale.”

Gary Williams

IT Infrastructure Team Lead

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“

Ably immediately solved our issues around the user experience and scale. It supports our customers’ stringent expectations as well as future product development.”

Max Freiert

Product Group Lead

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“

Ably copes easily with big loads. We don’t have to worry about stability, even when we get huge traffic spikes.”

Johan Bengtsson

CTO

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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

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	Ably	Firebase	Why this matters
Core features
Pub/Sub messaging	Reduces communication code complexity, simplifying the process of building highly functional and architecturally complex realtime apps.	Ably Yes Ably provides robust pub/sub messaging capabilities over serverless WebSockets.	Firebase Partial Firebase does not natively support Pub/Sub messaging. However, this can be implemented with Google's Pub/Sub service. Read more	Reduces communication code complexity, simplifying the process of building highly functional and architecturally complex realtime apps.
Chat capabilities	Accelerates the time to implement rich chat experiences with features such as read receipts, typing indicators, and more.	Ably Yes Ably Chat provides dedicated APIs for building out a scalable chat solution. We support individual and group messaging, typing indicators, room reactions, and more. Learn more about Ably Chat	Firebase Yes You can build chat capabilities on top of Firebase's Realtime Database.	Accelerates the time to implement rich chat experiences with features such as read receipts, typing indicators, and more.
Collaboration capabilities	Enables you to quickly integrate realtime collaborative features like live cursors, member location, avatar stacks, and component locking.	Ably Yes The Spaces SDK provides an opinionated set of abstractions for collaborative environments including live cursors, avatar stacks and component locking. Learn more	Firebase Yes	Enables you to quickly integrate realtime collaborative features like live cursors, member location, avatar stacks, and component locking.
State sync capabilities	Enables realtime data synchronization across devices and users, ensuring a cohesive and up-to-date user experience.	Ably Yes Ably provides a self-hostable and managed database connector to stream updates over our serverless WebSocket platform. Ably also provides the Models SDK for seamless connector interactions. Learn more	Firebase Yes The Firebase Realtime Database lets you store and sync data between your users in real time. Read more	Enables realtime data synchronization across devices and users, ensuring a cohesive and up-to-date user experience.
Presence	Maintaining a view of which users are connected, and their associated metadata, enables their online status to be updated in realtime.	Ably Yes	Firebase Yes Firebase Realtime Database natively supports presence. Read more	Maintaining a view of which users are connected, and their associated metadata, enables their online status to be updated in realtime.
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.	Ably Yes	Firebase Partial Firebase does not have built-in support for occupancy tracking. However, occupancy tracking functionality can be built on top of the Firebase Realtime Database.	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.
Message interactions	Enables interaction with previously-sent messages, facilitating the implementation of features like message reactions and threads.	Ably Partial Message interactions are natively supported in ably-js. There is not currently any API support for retrieving messages and their interactions efficiently from the Realtime service (under development). Learn more	Firebase Partial Message interactions are not natively supported in Firebase. However, you can programmatically build interactions on top of Firebase's Realtime Database.	Enables interaction with previously-sent messages, facilitating the implementation of features like message reactions and threads.
Message history	Enables clients to catch up on missed messages when inactive, ensuring a user doesn’t miss any important messages.	Ably Yes	Firebase No	Enables clients to catch up on missed messages when inactive, ensuring a user doesn’t miss any important messages.
Push notifications	Cross-platform push notifications make it possible to deliver important and timely messages to users even when they’re inactive.	Ably Yes Support for Android and iOS push notifications. Improved web-push for browsers currently in progress.	Firebase Yes You can create, send, and monitor push notifications using Firebase Cloud Messaging. Read more	Cross-platform push notifications make it possible to deliver important and timely messages to users even when they’re inactive.
Message delta compression	Minimizes bandwidth and can reduce latency, particularly in scenarios where continuous updates are sent.	Ably Yes Broadcast changes efficiently with our binary deltas, reducing bandwidth consumption by typically up to 95%.	Firebase No	Minimizes bandwidth and can reduce latency, particularly in scenarios where continuous updates are sent.
Programmatic management	Enables the automation of provisioning, management, and testing of service resources, simplifying integration with existing development workflows such as CI.	Ably Yes	Firebase Yes Firebase projects can be managed programmatically using the Firebase Management API.	Enables the automation of provisioning, management, and testing of service resources, simplifying integration with existing development workflows such as CI.
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.	Ably Yes	Firebase Yes The Spark plan (free plan) realtime database is limited to 100 simultaneous connections and 1 GB of storage. Read more	With a free plan, you can test the service’s functionality and compatibility with your project before committing to a paid plan.
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.	Ably Ably offers a per-minute, consumption-based pricing model. This gives granular control over your costs, eliminating the need to pay for peak users or connections.	Firebase Firebase offers a pay-as-you-go pricing plan, called Blaze, based on the services you use and the amount of unit costs incurred. Firebase pricing is usage-based, with most services charging per read, write, storage, and bandwidth. There are two main realtime database options, and other tools that can impact cost depending on your app architecture. Read more	The pricing model should align with your project's expected load, usage patterns, and budget in order to be cost-effective and efficient.
Pricing plans	The pricing plans offered by cost.	Ably The free and paid plans are: Free plan: Up to 6 million monthly messages and 200 concurrent connections Standard plan ($29/month): Up to 10k concurrent connections and channels, and 2.5k messages/second Pro plan ($399/month): Up to 50k concurrent connections and channels, and 10k messages/second Enterprise plan: For committed use, with custom pricing Learn more	Firebase Free (Spark) plan: Limited to 100 simultaneous connections and 1 GB of storage. PAYG (Blaze) plan: 1 GB of storage is priced at $5. Supports multiple databases per project.	The pricing plans offered by cost.
Integrations & interoperability
SDKs	Supporting multiple languages and platforms offers greater flexibility when building cross-platform realtime apps.	Ably Java Javascript (browsers) React Native React Hooks Android Clojure Cordova / Phonegap Flutter Go iOS Objective-C iOS Swift Kotlin Laravel (PHP) MacOS Mono NativeScript .NET Node.js PHP (REST only) Scala Python Ruby (REST only) tvOS Unity Xamarin + Xamarin.forms	Firebase iOS Android Web C++ Unity	Supporting multiple languages and platforms offers greater flexibility when building cross-platform realtime apps.
Supported realtime protocols	Support for multiple protocols provides the flexibility to choose a protocol that best suits your project’s requirements.	Ably WebSockets MQTT Server-Sent Events (SSE) Fallback to Comet (XHR) and Long Polling for older browsers	Firebase WebSockets Server-sent events (SSEs)	Support for multiple protocols provides the flexibility to choose a protocol that best suits your project’s requirements.
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.	Ably AWS Lambda Microsoft Azure Functions Cloudflare Workers Google Cloud Functions	Firebase Firebase supports serverless functions through Cloud Functions for Firebase. Read more	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.
Streaming & queueing	Provides a dependable method to reroute messages from the service to third-party streams and queues for further processing.	Ably Egress: Kafka Kinesis AMQP SQS Pulsar Ably-hosted queues Ingress: Kafka Connector Postgress (via Database Connector) The Database Connector is designed for any database in the SQL-family, but at the moment only supports Postgres. Please contact us if you want support in other databases.	Firebase Yes	Provides a dependable method to reroute messages from the service to third-party streams and queues for further processing.
Observability services	Enables realtime monitoring and troubleshooting by offering insights into service behavior directly in your observability platform of choice.	Ably Yes	Firebase Yes Using Firebase Performance Monitoring you can monitor your application performance based on location, device, or version.	Enables realtime monitoring and troubleshooting by offering insights into service behavior directly in your observability platform of choice.
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.	Ably Terraform Control API + SDKs	Firebase Yes Supports: Jenkins Buddy CI/CD Google Cloud Build GitHub Workflow	Makes it possible to provision and configure service infrastructure as part of a CI or CD pipeline, enabling repeatable and reliable deployments.
Quality of Service
Scalability	Scalability is vital as it ensures the service can handle increased data load or users without compromising performance.	Ably <50 ms median global latency 2 trillion+ monthly transactions 1 billion monthly device connections 99.999% uptime SLA Unlimited throughput capacity at system level, limitless channel churn rate	Firebase Firebase is limited to 200k simultaneous connections (100 for Spark plan), 1000 Cloud Functions per write (500 for v2 per region), 1 MB event size, and 10 MB/sec data transfer to Cloud Functions.	Scalability is vital as it ensures the service can handle increased data load or users without compromising performance.
Guaranteed message delivery	Ensures messages are never lost during transmission, even in the presence of network disruptions.	Ably Yes	Firebase No	Ensures messages are never lost during transmission, even in the presence of network disruptions.
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.	Ably Yes	Firebase No	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.
Exactly-once message delivery	Guarantees that each message is processed exactly once, preventing data inconsistencies that can arise from duplicate processing or missing messages.	Ably Yes	Firebase No	Guarantees that each message is processed exactly once, preventing data inconsistencies that can arise from duplicate processing or missing messages.
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.	Ably 99.999%.	Firebase 99.95%. Read more	An uptime guarantee instills confidence in the reliability of the service and protects your business from the negative impacts of downtime.
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.	Ably Yes All Ably customer data runs across all our 7 geographically-distributed core routing datacenters by default. Ably's network of 385 edge acceleration points-of-presence is growing day by day.	Firebase Yes Firebase's global CDN (content delivery network) supports a global edge network by integrating with Google Cloud Platform (GCP), with edge PoPs spanning over 180 internet exchanges and over 160 interconnection facilities worldwide. Read more	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.
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.	Ably Yes	Firebase Partial Firebase supports multi-region data replication, primarily through Cloud Firestore locations, but this is not supported in Firebase Realtime Database. Read more	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.
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.	Ably Yes	Firebase Yes Firebase's design uses Google Cloud Platform's infrastructure, which implements redundancy and automatic failover features.	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.
Latency	Low latency is crucial for realtime apps as it ensures swift and efficient data transmissions, providing a smoother and more responsive user experience.	Ably <50ms round trip latency for the 99th percentile <35ms latency once traffic arrives within AWS	Firebase Unknown.	Low latency is crucial for realtime apps as it ensures swift and efficient data transmissions, providing a smoother and more responsive user experience.
Security & compliance
API key authentication	Simplifies the authentication code on trusted servers compared to requesting, managing, and refreshing tokens.	Ably Yes	Firebase Yes	Simplifies the authentication code on trusted servers compared to requesting, managing, and refreshing tokens.
Token-based authentication	Provides a means to securely authenticate user devices against your user management system.	Ably Yes	Firebase Yes Supported with JSON Web Tokens (JWTs). Read more	Provides a means to securely authenticate user devices against your user management system.
Single Sign-On (SSO) authentication	SSO streamlines login processes, boosts security by minimizing password use, and meets compliance needs for secure data access management.	Ably Yes	Firebase Yes SSO in a Firebase application can be implemented using SAML (Security Assertion Markup Language). Read more	SSO streamlines login processes, boosts security by minimizing password use, and meets compliance needs for secure data access management.
Rules for permissions and operations	Provides control over which users can subscribe and publish to certain channels.	Ably Yes	Firebase Yes Using Firebase Realtime Database Security Rules you can set who has access to your database. Read more	Provides control over which users can subscribe and publish to certain channels.
End-to-end encryption	Ensures that the data transmitted between the client and the API server remains confidential and secure while in transit.	Ably Yes Ably offers SSL/TLS encryption and 256-bit AES encryption using private keys. Message payloads can only be decrypted by other clients that share your secret key. Learn more about Ably's encryption	Firebase No Data in transit is encrypted using HTTPS in all Firebase services, but this does not include end-to-end encryption. Read more	Ensures that the data transmitted between the client and the API server remains confidential and secure while in transit.
Encryption at rest	Ensures data stored by the service is secure and compliant, while also mitigating the risks of a data breach.	Ably Yes	Firebase Partial Some Firebase services are encrypted at rest while others are not. Firebase Realtime Database and Firebase Cloud Messaging are encrypted at rest. Read more	Ensures data stored by the service is secure and compliant, while also mitigating the risks of a data breach.
Compliance	Compliance with regulations can impact your ability to meet legal obligations in your industry.	Ably SOC 2 certified HIPAA compliant EU GDPR compliant Ably also offers EU and US-only data storage.	Firebase Firebase ensures compliance with international and industry standards for security and privacy standards including: GDPR CCPA ISO 27001 SOC 1 SOC 2 SOC 3 Read more	Compliance with regulations can impact your ability to meet legal obligations in your industry.