There are a lot of great apps to stay productive out there, but my personal favourite is AppBlock. It's a really simple app, but it's really effective. You just add the apps you want to block for a certain amount of time, and then the app will block them for you.
I love using AppBlock to block social media apps when I need to focus on a project. It's really helpful to be able to block them for a set amount of time, and then unblock them when I'm done. I also like to use it to block games when I need to get some work done.
If you're looking for an easy way to stay productive, I definitely recommend checking out AppBlock.