Replacement for FlexiAuth??

I will migrate an application write on old 2.1.3 and is using Flexiauth. I will try to migrate everything to the latest version 3.1 so does anyone knows a replacement for Flexiauth or can tell me if Flexiauth still working? I want to be sure before touch anything

Thanks in advance

Thats why you always make a backup before you change something ;-)

Just copy your project to localhost or a seperate (sub) domain and start testing.

Too lazy, lol, I will start something new from scratch and I switched from Flexiauth to Ion Auth