When comparing Back4App vs Google Firebase, the Slant community recommends Google Firebase for most people. In the question“What are the best Android BaaS (Backend as a Service) providers?” Google Firebase is ranked 1st while Back4App is ranked 3rd. The most important reason people chose Google Firebase is:
The Blaze Plan is a pay-as-you-go plan, which is, you pay for what you use, without overhead or upfront costs.
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Pros
Pro Open source
Back4app is an open source BAAS and Backend generator.
Pro Smooth migration from Parse
Back4App offers a smooth migration for all former Parse users who wish to migrate their data now that Parse has announced that it will stop soon.
Pro Flexible Pricing
The Blaze Plan is a pay-as-you-go plan, which is, you pay for what you use, without overhead or upfront costs.
Pro Straightforward hosting
Powered by Google's Cloud Platform, Firebase allows you to deploy static web pages or web applications with a nifty Node.js-based CLI Tool.
Pro Super fast CDN
All static website content is hosted on the Fastly CDN making your website really fast.
Pro More than just hosting web applications
In the core of Firebase allows you to do testing for Android apps, Analytics, Real-time Database, and many more. It's centered mostly for progressive web applications and mobile applications with real-time connectivity to your service.
Pro Almost free if you add Cloudflare in front (no bandwidth costs) and cache effectively
The built-in CDN is great too, but if you're concerned about bandwidth costs, using it with Cloudflare is an excellent option option.
Cons
Con Uses MongoDB for the backend, which is not considered very safe by many
Back4App uses MongoDB as the database where data is stored. Mongo has been known to have issues with data corruption and data loss.
Con Google blocks Access
Some Google services, software and cloud systems, are not available to certain countries. blocked access by google following USA Policies.
Con Linked to Google Cloud Platform
If you don't have a Google Account, you won't be able to access Google cloud services, including this one.