Anna's Archive and Z-Library are two popular open-access book search engines that have been making waves in the literary world. Both platforms have been at the center of controversy, with Anna's Archive emerging as a response to the shutdown of Z-Library by the United States authorities.

**Anna's Archive**

Anna's Archive is a non-profit, volunteer-run search engine that indexes metadata from various online libraries, including physical and digital repositories. The platform is free from copyrighted materials, only storing metadata that can be accessed through other means. In November 2022, the team behind Anna's Archive decided to create this platform after discovering Z-Library's shutdown.

As of November 1, 2023, the platform boasts an impressive collection of 22,052,322 books, 97,847,390 articles, 2,451,032 comics, and 673,013 magazines. The team behind Anna's Archive emphasizes that it is a non-profit organization, although it accepts donations to offset its costs.

**Z-Library**

Z-Library, also known as Z-Lib, is a shadow library and an open-access file-sharing platform. Founded in 2009, the platform allows users to download academic articles, books, and other materials. As of June 12, 2022, Z-Library reported a staggering 10,456,034 books and 84,837,646 articles in its collection.

Z-Library claims to be the world's largest digital library and the largest repository of scientific articles. This claim is disputed, as the platform relies heavily on user-uploaded content that may not be verified. The platform's public-facing domain was blocked by the United States authorities on November 3, 2022. However, users can once again access Z-Library as of February 11, 2023.

While both platforms offer open-access book search capabilities, Anna's Archive appears to be a more transparent and community-driven effort. The team behind this platform emphasizes its commitment to non-profit status and transparency, unlike Z-Library, which has faced criticism for its handling of user-uploaded content. Ultimately, the choice between these two platforms depends on individual preferences and values.