This sandbox is used mainly for the development process. It contains a copy of all the production metadata but no records at all (exceptions include users, for instance). Having no access to real production data allows administrators and developers to safely develop their features without worrying about how data should be handled.

The Developer sandbox can be refreshed from production once a day and it can hold up to 200 MB of data and 200 MB of file storage. This kind of sandbox is usually assigned to individual developers so that they are free to dismantle an organization without it having an impact on their colleagues.