When comparing Parse vs Back4App, the Slant community recommends Back4App for most people. In the question“What are the best self-hosted BaaS (backend-as-a-service) providers?” Back4App is ranked 5th while Parse is ranked 6th. The most important reason people chose Back4App is:
The user is not a hostage and can migrate the application to other hosting service whenever they want.
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Pro Free plan
Parse offers unlimited API calls (max of 30req/sec), 1 million pushed and analytics for free.
Pro Asynchronous uploading of files
When you want to upload a file, you just create an object and initialize the file upload to the server (this is done asynchronously).
Pro Simple and seamless user registration
User registration with Parse is pretty good and usually works without any problems. It's also very easy to use, you simply pass the username, password, email, etc. to the required method and register a callback that returns whether the registration was a success or a failure.
Same thing is done for login and logout as well.
Pro Extremely easy to setup
Setting up a backend for an app with Parse is very easy and takes minutes. All you have to do is sign up and through their graphical interface follow all the steps, which boils down to creating tables and identifying the type of data that is being stored.
Then you download the library, integrate it with your app and initialize the process with one single line.
Pro Great documentation
Parse has excellent documentation. Everything is thoroughly explained and all parts of the documentation are complete. It's actually very helpful for both beginners and advanced users alike.
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.
Parse has been discontinued and will not be available anymore.
Con Parse.com is shutting down
Facebook decided to shut down Parse.com. It will be fully retired on January 28th, 2017.
Con There can be downtimes
There have been several reports that it's not unlikely for Parse to go down several minutes almost every day. This can be very frustrating for both developers and users who are using apps built on Parse.
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.