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Perlego vs VitalSource Bookshelf: catalog facts
Perlego	VitalSource Bookshelf
Paid Paid membership gives access to the whole library.	Free The reader app is free; textbooks are bought or provided by schools separately.
Android, iOS, Web	macOS, Android, iOS, Web
Over 1.5 million academic and professional titles One membership instead of buying individual textbooks	Offline reading of downloaded titles Notes and position sync across devices
Requires an ongoing paid subscription Books are accessed through the service rather than owned as files	Only reads titles from VitalSource Textbooks must be purchased or provided by an institution
Downloadable app, Web application, Hosted service	Downloadable app, Web application
Closed source	Closed source
License not stated	License not stated
Account needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.