Parallel Accounts is described as 'Operating as a virtual OS on your mobile phone, Parallel Accounts allows you to run multiple accounts of the same app simultaneously on a single phone, with just a tap to switch between the apps. It also helps hide apps for better privacy'. There are nine alternatives to Parallel Accounts for Android, Android Tablet, Firefox and Online / Web-based. The best alternative is Firefox Multi-account Containers, which is both free and Open Source. Other great apps like Parallel Accounts are island (Free, Open Source), Parallel Space (Freemium), App Cloner (Freemium) and Temporary Containers (Free, Open Source).
The Firefox Multi-Account Containers extension lets you carve out a separate box for each of your online lives – no more opening a different browser just to check your work email! Here is a quick video showing you how it works.
What is “Island” “Island” is a sandbox environment to clone selected apps and isolate them from accessing your personal data outside the sandbox (including call logs, contacts, photos and etc) even if related permissions are granted.
Easily open disposable containers that isolate attached data and are deleted after usage: Fully automatic, based on navigation-target, for certain websites, with configured mouse clicks on links or just by using the toolbar icon.
Firefox extension to automatically open websites in a container. Map multiple domains and subdomain to a container with simple CSV based config. Once mapped, this extension will always open the site in a container. This behavior is disabled in private mode.
NoxApp+ is a master of managing multiple accounts, especially designed for social apps and games. If you have more than one account for the same app, use NoxApp+ to run them simultaneously on your phone. .