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Pro Prevents distractions
There is a setting to block distractions, although this also blocks Google search which could be undesirable for researchers or anybody else that needs to access the web to be productive.
Pro Configurable break sessions
You can change how frequent breaks are, how long they last, and after a few short breaks you can configure a long break.
Con One time use
Unfortunately, you can't currently save your profiles. This means that each time you use the app you will need to re-configure the settings