I was happy with the app as it has friendly UIs. But today I'm really upset about it as it does not allow me to block more sites unless I subscribe, and in their website it is not clearly stated how many websites we can block in the free version. I tried to delete some and it still does not allow me to add new website - it is clear that it forces me to pay if I want to continue with the extension. It feels so bad and I will shift to other extensions as it does worth it if I only want to block one or more sites.