Opal is like a mix of One Sec App, Freedom.to and BePresent. You can start focus sessions that block select apps and websites for your desired period of time.
The sessions have three levels of difficulty. You have your “normal” sessions where you can take breaks or leave the sessions early, and you have “timeout” sessions where you can still take breaks but after each one you have to wait longer before you can request another break again. You can also upgrade to a paid membership to do “deep focus” sessions that put hard blocks on the apps that you are not allowed to evade until the session is over.
It also gamifies the process, much like BePresent. You can collect gemstones the longer you spend using the app, and can add your friends to compare your progress.
And as a plus, it helps you track your progress by sending you detailed reports at the end of every week with metrics and actionable stats on how well you were able to focus, and how you compared to your friends.
Opal is free to download and free to use with most of its basic features. If you wish to upgrade your membership to have unlimited recurring blocking sessions, and the ability to have the “deep focus” sessions, it costs $8.29 a month.