DEVONthink To Go 3 is a free document repository for iOS users, developed by DEVONtechnologies LLC. It is an excellent tool for those who work on iOS and need to keep their important documents with them all the time. The app allows users to browse PDFs, notes, images, bookmarks, and almost any file type, neatly organized into databases and groups. The app also has built-in editing capabilities for texts, Markdown files, or rich text documents.

The app offers several ways to organize the document collection, including sorting documents into groups, adding them to more than one group at a time, or adding tags. Users can also flag items, mark them as unread, or give them a star rating. The app offers fast full-text search, and predefined smart groups show all flagged or unread documents. DEVONthink To Go 3 is deeply integrated into the Files app, allowing users to save files directly to the app and use drag-and-drop both inside the app and with other apps. The app offers strong encryption to ensure that user data belongs to them, not to the service provider or the app developer.