Theological Research, Reimagined
Theostack searches a curated library of orthodox theological sources and returns grounded answers with full attribution. No hallucinated citations. No made-up quotes. Just the texts — and what they actually say.
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The Problem
ChatGPT and Claude are remarkable tools. But when pastors use them for theological research, they run into the same problem: the model doesn't know the difference between what Augustine wrote and what it thinks Augustine might have written.
Citations get fabricated. Authors get conflated. Nuance gets flattened. And the pastor has no way to verify any of it without doing the research themselves — which was the whole point.
Theostack solves this by searching real texts, returning real passages, and showing you exactly where every claim comes from.
I spent an hour chasing a quote ChatGPT attributed to Calvin. It didn't exist. I needed something I could trust.
— Pastor, Reformed tradition
What You Get
Over 2,200 works from the Church Fathers through modern scholarship, hand-selected for orthodoxy and pastoral value.
Every response cites real passages from real texts. No hallucinated quotes. No made-up authors. Full attribution on every answer.
5 included with every plan, 6 more with Premium. Purpose-built for sermon prep, exegesis, counseling, apologetics, and more — each with its own theological focus.
Speak your questions and get spoken answers backed by the same curated library. Ideal for sermon prep on the go.
Organize research by sermon series, Bible study, or topic. Upload your notes and Theostack weaves them into every conversation.
Automatic verse resolution, cross-references, and inline scripture display. Ask about a passage and see the text alongside theological commentary.
The Library
2,200+
Works
9
Collections
11
Assistants
Start free. Upgrade when you're ready.
Theological writing, library updates, and resources for your study. Delivered when it matters.
I can prep a sermon in half the time. The sources are real, the citations check out, and I actually learn something new every session.
Senior Pastor
Presbyterian Church
I used to toggle between Logos, ChatGPT, and my own notes. Theostack puts it all in one place — and the answers are actually grounded.
Teaching Pastor
Non-denominational
The voice mode is a game changer. I ask questions while I walk and get real answers from real theologians. Not AI guesses.
Associate Pastor
Baptist Church