Christian relevance
A work must meaningfully serve Christian study, history, formation, testimony, worship, or faithful imagination.
A library for every seeker
100,000 books.
One living library.
Explore a monumental digital collection of Christian thought, devotion, history, and imagination—preserved for readers everywhere.
100,000+books to discover
20books at a time
30 daysto read each loan
A library without walls
Building the world’s largest
Christian digital library.
From foundational theology to quiet devotional classics, ChristBooks brings generations of Christian writing into one beautiful place—searchable, borrowable, and ready to read wherever you are.
Your personal library
My Shelf
Your borrowed books live here.
0of 20 slots used
Protecting the Christian corpus
Not every book
belongs on this shelf.
ChristBooks exists to preserve the breadth of Christianity’s written inheritance without surrendering the reader’s trust. We aspire to find every qualified Codex work—and require each admitted edition to earn its place.
Rights and provenance
Source identity, edition evidence, public-domain or authorized-use status, and content lineage are reviewed and preserved.
Whole-book integrity
Completeness, readable structure, metadata, duplication, and technical quality are checked before publication.
A shelf worth trusting
Candidates that fail the standard are quarantined or rejected. Collection size never outranks truth, quality, or the dignity of the reader.
Our promise: we do not admit a title merely to make the number larger. ChristBooks grows through careful selection, documented evidence, and review.
Explore the shelves
Find your next book
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Simple, generous borrowing
Your reading life,
with room to wander.
Build a shelf for study, prayer, curiosity, and joy. Your account keeps every loan and reading place together.
- 01
Join ChristBooks
Create a free account and open the doors to the collection.
- 02
Borrow up to 20 books
Keep twenty titles on your shelf at once for thirty days each.
- 03
Read online, anywhere
Open the reader and continue from where you left off on any device.
- 04
Return whenever you’re ready
Return a book early to make room for another discovery.
A first in library history
ChristBooks has its own
operating system.
For the first time, a library has created an operating system: Jesus New OS. It is the mobile experience of knowledge-bearing—an entire operating system built to help people carry, explore, and live with knowledge.
Inside Jesus New OS, Codex is the mobile library experience, and the Living Codex turns the Corpus of Christ into a navigable world: a vast hallway where books become rooms, paths, and places to return to.
- ✦ Explore a spatial library world
- ✦ Enter permanent rooms for books you love
- ✦ Carry your ChristBooks discoveries further
Available now for iPhone and iPad. Visit JesusNewOS.com to experience the knowledge-bearing OS and explore its wider family of innovative technologies.
PineCone: the knowledge-bearing phone.ChristBooks is creating a phone designed to connect directly with the Jesus New OS knowledge-bearing experience. PineCone is in development for a planned December 2026 release.
Founded by Christian Cassarly
A life’s testimony,
built into a library.
Christian Cassarly describes a life shaped by rejection, perseverance, and a desire to build for the Kingdom of God. After creating Jesus New OS, he founded ChristBooks as a continuing testimony: preserve Christian knowledge, open it freely to readers, and build technology that points beyond itself toward Jesus Christ.
Our founding conviction: the library is an offering of knowledge, faith, and possibility for generations still to come.
Keep the books free
Help build a library
worthy of its mission.
If you honor the knowledge of God and believe Christian books should remain available to every reader, help us preserve, verify, prepare, and share them. Your support moves us toward a bold vision: that the world’s largest library can be a Christian library—and that its books can remain free to read.
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A hundred thousand books.
Where will you begin?
No payment required. Borrow up to 20 books.