Web and mobile apps require a similar set of features on the backend, including
notification service, integration with
social networks, and
cloud storage.[9][10] Each of these services has its own
API that must be individually incorporated into an app, a process that can be time-consuming and complicated for app developers.[11] BaaS providers form a bridge between the
frontend of an application and various cloud-based backends via a unified
API and
SDK.[3]
Providing a consistent way to manage backend data means that developers do not need to redevelop their own backend for each of the services that their apps need to access,[10] potentially saving both time and money.[11][12]
Although similar to other cloud-computing business models, such as
serverless computing,
software as a service (SaaS),
infrastructure as a service (IaaS), and
platform as a service (PaaS), BaaS is distinct from these other services in that it specifically addresses the cloud-computing needs of web and mobile app developers by providing a unified means of connecting their apps to cloud services.[13]
Features
BaaS providers offer different set of features and backend tools.[14] Some of the most common features include:
Database management. Most BaaS solutions provide
SQL and/or
NoSQL database management services for applications.[15] Developers can store their app data without deploying and managing databases themselves. BaaS usually provides client
SDKs,
REST and
GraphQLAPIs for the frontend to interact with databases.
File storage. BaaS providers often offer storage solutions for media files, user uploads, and other binary data. Applications can upload, download, and delete files through provided
SDKs and
APIs.
Authentication and authorization. Some BaaS offer authentication and authorization services that allow developers to easily manage app users.[15] This includes user sign-up, login, password reset, social media login integration through
OAuth, user group and permission management etc.
Notification service. Some BaaS providers such as
Firebase and
AWS Amplify have notification services that can send custom emails to users and push native notifications on mobile platforms.[16][17] This is especially useful for applications that need to send messages, alerts, and reminders.
Cloud functions. Some BaaS allow developers to deploy and run
serverless functions. The functions are usually stateless and can be triggered by various ways including
HTTP requests, SDK invocation, background server events, and cloud scheduled executions.[18][19] Different providers offer
runtime support for different languages, some of the popular languages are
JavaScript/
TypeScript (
Node.js,
Deno),
Python,
Java/
Kotlin.[18][19][20] Cloud functions extend the potential and flexibility of BaaS by allowing developers to write custom functionalities for their apps, working in a way similar to a traditional
REST APIbackend framework.[21]
Usage analytics. Analytics data about application usage is often included in BaaS. This allows developers to monitor user behaviors and make decisions correspondingly in marketing strategies and performance optimizations.[22][23]
UI design. Some BaaS providers, such as
AWS Amplify and Backendless, offer user interface designing tools that help developers design the frontend UI of web and mobile apps.[24][25] While this may be useful for small teams and individual developers, UI design assistance may not be conventional in BaaS as it goes beyond the scope of backend infrastructure.
Others. Different BaaS providers have their unique feature offerings. To list a few,
Firebase supports pre-packaged extensions to provide features and integrations with other platforms.[26]Appwrite has avatar and localization services to manage icons and user locations.[27][28]Back4App offers autonomous
AI agents to assist with
DevOps.[29]
Service providers
BaaS providers have a broad focus, providing
SDKs and
APIs that work for app development on multiple platforms with different technology stacks, such as
JavaScript (for Web apps),
Flutter,
Java/
Kotlin (for
Android apps),
Swift/
Objective-C (for
iOS/
MacOS/
WatchOS/
TvOS apps),
.NET (for
Windows) and others. BaaS providers also come in different types, suiting developers of different needs.
Cloud-based BaaS
Most BaaS providers host backend platforms on their cloud servers.[30] They also manage the infrastructure, security, and scalability of the platforms. Developers can access the backend services via a web interface or the provided
APIs.[15] Some examples of cloud-based BaaS include
Firebase (hosted on
Google Cloud Platform),
AWS Amplify (hosted on
Amazon Web Services), and
Microsoft Azure Mobile Apps (hosted on
Microsoft Azure).
Self-hosted BaaS
Self-hosted BaaS allow developers to host backend on their own servers, providing more flexibility and potential to customization compared to cloud-based BaaS, which often is more difficult to migrate from. However, developers are also in charge of managing the infrastructure, security, and scalability of their servers.[15][30] Some of the self-hosted BaaS are
open source.
Supabase, for example, features itself as "the open source
Firebase alternative",[31] emphasizing its flexibility and openness as a community supported project in comparison to
Firebase. While being open source and support self hosting,
Supabase and some other providers such as
Appwrite and
Strapi also offer paid cloud-based hosting services.
Mobile BaaS
Mobile backend as a service (MBaaS) is a type of BaaS specifically for applications deployed in
mobile systems. While some references use MBaaS interchangeably for BaaS, BaaS can have a wider variety of support such as for web apps and desktop apps.[32][33] Some examples of MBaaS are
Backendless and
Microsoft Azure Mobile Apps.
Business model
BaaS providers generate
revenue from their services in various ways, often using a
freemium model. Under this model, a client receives a certain number of free active users or API
calls per month, and pays a fee for each user or call over this limit. Alternatively, clients can pay a set fee for a package which allows for a greater number of calls or active users per month.[10] There are also flat fee plans that make the pricing more predictable. Some of the providers offer the unlimited API calls inside their free plan offerings.[34] Another business model that has been used by a lot of BaaS providers is PAYG (pay as you go),[35] which has a flexible cost based on developers' usage of database, storage, bandwidth, function calls, user numbers etc.