DeepDyve is a commercial website that sells[1] access to scientific and scholarly articles.
A user can buy PDFs of individual papers or get a subscription that offers unlimited reading access[2] to papers from publishers in their network, which includes publishers like Wiley, Springer Nature, JAMA, and Wolters Kluwer.
Some of the notable publishers are: According to the same sources there are over 25 million articles from more than 15,000 peer-reviewed journals available.
The current viewing interface (January 2023) for article reading is implemented by rendering the article pages as images on the screen.
[original research] In addition to viewing the full-text article through a browser, subscribers are prevented from printing more than 20 article pages per month.