Welcome to Exchanged Library

Who were the Christian writers of the past two thousand years, when did they live, what did they write, and where can I read it? Exchanged Library exists to answer those four questions in one place, across the whole tradition: Catholic, Orthodox, Protestant and beyond, ancient and modern, East and West.

It is a free starting point for anyone curious about Christian writing and its historical context, whether you are new to it or have read in it for years.

An invitation to explore

Exchanged Library is a discovery resource, not a scholarly or theological authority. All of its descriptions, biographies, ratings and other contextual content were created by AI and may contain errors. The library is too large for every record to be checked by hand, so it relies on its readers: please consult the original works, check anything important to your studies, and help improve the library by telling us what you find. Use the Report an issue button on any work page, or the Contact Us button in the footer of any page.

Free, with nothing in the way

• No login. There is no account, no registration and no sign-in.
• No advertising. Nothing on the site is sold, and nothing tracks you across the web.
• No fees. Every tool and every page is free to use.
• Independent. The library is built and maintained without sponsorship or outside funding. If it is useful to you, a voluntary contribution is welcome; it is never required.

What you can do here

• Search the Library by subject, title or name, then narrow by era, tradition, language, difficulty, or what you can read free today. How searching works →
• Walk the Interactive Timeline to see who lived and wrote alongside whom, and follow a tradition across the centuries. How to use the timeline →
• Follow the Influence Map to see which writers each author drew on, answered or taught, with the evidence for every link. How to read the map →
• Look up a term in the Glossary for plain definitions of theological and historical words, with the differences between traditions noted. How to use the glossary →
• Read texts here: 97 public-domain texts are hosted on the site, set for comfortable reading, with a growing number to come. How the reader works →
• Browse the library: 570 authors and 7,392 works, each with a page of its own, plus collections.
• Build a Reading List as you go. It stays in your browser, ready to copy, download or share. How the reading list works →

Every work has a page of its own, with the editions we know of and, for many, a short guide to who it suits and how demanding it is.

Two groups of authors

The library's authors fall into two broad groups. Authors still under copyright are described, and so are their works, but we can link to few of those works, because most are not legally available to read free online. Authors in the public domain are different: their works are linked to the editions available to read or hear, and a growing number are hosted here in the reader.

How it was built

The library began as a personal research project and was built by one person, with AI doing the research and writing. Authors, works and editions were gathered in research passes against published sources, and the descriptions, biographies, ratings and glossary definitions were written by AI. The records have not been individually reviewed before publication, so errors are expected, and corrections from readers are how they get fixed. About the Data explains the sources, the method and the limits in full, and About tells the longer story.

Keeping up

The data work is ongoing. Many public-domain authors have yet to be fully researched and populated, so some author pages are sparse and some works have no editions listed yet. More are added continually. See News for the latest updates, and Library Status for current progress on the data.

Start exploring →