Logos is short for Logos Bible software from Faithlife. Logos provides software and collections of Christian Bible study books.
- Logos Desktop systems are available for MacOS and Windows.
- Logos Mobile versions are available for iOS, iPadOS, and Android (including Chrome OS)
- There is also a version targeted at Web Browsers, See: Logos web app for all other platforms or when you don't want to download software such as when using someone else's computer.
 eBook sources
Logos calls eBooks as "resources" and lumps them together with other items. These sources will all work with the Logos software.
- https://Books.Logos.com more that 8,000 books (possible eBooks to be created)
- https://Verbum.com - Catholic
- https://lexhampress.com - Lexham Press
- https://es.logos.com - Spanish
- https://sc.logos.com - Chinese simplified
- https://tc.logos.com - Chinese traditional
- https://de.logos.com - German
- https://pt.logos.com - Portuguese
Note that some eBooks are sold as a rental and will expire if not renewed. There are also offers for books that are not yet published. There are groups of books that might save you money if you want most or all of them. Be sure that you are buying what you want. Many of the same eBooks are in the various sources but you may find different deals. There is also a bidding system to get a new book published by promising to buy it.