The original OPDS 1.x is simple and robust. OPDS 2.0 adds JSON instead of XML, better pagination, and richer metadata (reviews, holds, loans). It’s still gaining adoption, but libraries like Readium and Nyxis are pushing it forward.
This guide explores what OPDS feeds are, how they work, and why they are the "secret sauce" for personal digital libraries and public book distribution alike. What is an OPDS Feed? opds feed
If you want something lighter than a full Calibre installation, COPS is a PHP-based alternative. It is highly efficient, works well on low-power devices like a , and creates a clean OPDS feed directly from your existing Calibre database. 3. Kavita and Ubooquity The original OPDS 1