Most AI rewrites your book mid-chapter. Invents scripture. Fabricates stats. You stop writing and start fact-checking.
OpusDraft enforces your rules, your facts, your sources — what we call your canon — on every AI action. For books. For sermons. For pitches. For anything long-form that has to stay true.
3-day free trial. No credit card.
Start Writing With Control💻 Desktop 💻 Laptop 📲 iPad
Best experienced on desktop or laptop. Works on iPad.
The first AI writing platform where AI enforces your rules — not its training data.
Real Output Comparison
Same content. Same AI model. Only one refuses to break your work.
Sarah → Sara mid-chapter. Nobody notices until your copyeditor does.
Invented Bible verses attributed to “John 3:17.” A verse that doesn't exist.
“Expand” adds 400 words of generic filler nobody asked for.
Your villain's backstory contradicts Chapter 3. AI doesn't notice.
Canon locked. Names, traits, timelines enforced on every action.
Scripture verified. Every verse checked against the translation you chose.
Expand adds 1–2 sensory details. Controlled. Precise. No bloat.
Contradiction? You see this instead:
The AI stops. You decide.
The hook
Point it at chapters you’ve already written. It extracts characters, places, dates, references, and seeds your canon database for you. Incremental — subsequent scans only read what changed. You stop maintaining the canon by hand; OpusDraft maintains it for you.
The core
Lock your characters, locations, timelines, world rules — any fact you don’t want broken. Every AI action is checked against them. Violations are blocked with a named, readable error telling you exactly which rule would have broken and why. No prompt engineering. No reminders. The AI simply refuses.
The workflow
Highlight any passage. Click a tool. The AI rewrites right there, in your chapter. You see the original and the new version side-by-side with Accept / Reject buttons. No chat window. No copy-paste dance. Works with Improve, Generate, and the tools you trigger from Agent Mode — every chapter, every section.
Plus the full toolkit
Scripture, stats, and quotes are verified against the sources you provide. No invented verses. No made-up numbers. Primarily for speakers and researchers.
Define voice, tone, pacing, structure. These aren't suggestions — they're enforced on every AI action.
Improve (with four intent variations), Generate, Full Polish, Agent Mode (Preview), and Ask AI. Every surface runs through your canon, rule packs, and style guide before touching your text. Output streams live.
Slide-out panels inside the editor — browse your canon and your rule packs without leaving the chapter. No navigation break.
Describe how you write — POV, tense, rhythm, tag preference — once. Every AI tool reads it on every call. The AI sounds like you, not like ChatGPT.
Toggle a chapter public and share it with beta readers, agents, or the world. Clean read-page with your byline. Unpublish to make private again.
Beyond Books
The same engine that locks a novel’s canon locks a sermon’s scripture, a keynote’s message, and a pitch’s numbers.
Already have a finished sermon? Upload it. OpusDraft splits it into sections AND auto-classifies each one — Big Idea, Main Point, Application, Close — reading both your section titles and the opening body prose. Catches “Big Idea:” even when the heading is generic. Review every tag before commit; override anything that looks wrong.
Sermon (3-point), Expository, Narrative, Keynote, Pitch Deck, Workshop, Academic Lecture, and more. Browse the whole shelf — preview structures, read descriptions, pick what fits. You’re not locked into one format.
Paste the translation you’re using. The AI refuses to invent verses, miscite references, or hallucinate statistics. Every attribution tracked on export.
Same draft, every surface: PDF manuscript, timed speaker notes (130 wpm), scrolling teleprompter, 2-up printable outline cards, slide bullets. For the pulpit. For the stage. For the boardroom.
Pastors. Keynote speakers. Founders. Consultants. Teachers. Anyone whose words have to be right the first time.
Not for people who want AI to do their thinking. For people who want AI to respect it.
Your canon, rules, and voice now live one level up — at the series, not just the book. Every book in the arc picks them up automatically. On OpusDraft and OpusDraft Pro.
No prompts. No reminders. No babysitting the AI. It just follows your rules.
Paste any chapter or outline you've already written. No reformatting. No starting over.
Pick a tool, highlight text, click. Results appear instantly with your rules applied.
Designed for books, sermons, and keynotes — not chatbot prompts. Real structure for real stakes.
Full OpusSmith-tier access for three days — Improve (in all four intent modes), Generate, and Ask AI — on our key, on us. 50 calls per 24-hour window. Stop there and you owe nothing. Continue and your writing, canon, chapters, and rules all stay.
We don't mark up AI. OpusDraft is BYOK on every paid tier — you pay Anthropic directly for the tokens you use (typically $2–10/month for a steady writer). We never see your tokens, never bill your AI usage, and never raise your AI prices.
Helping AI follow the work instead of fighting it.
I built OpusDraft because I was tired of fixing AI mistakes — invented Bible verses in my sermon drafts, characters changing eye color between chapters, prose that sounded like everyone else’s prose. Most AI writing tools are trained to produce something. OpusDraft is trained to follow what’s already there. The canon you’ve built. The rules you’ve set. The voice you’ve found. The work is the source of truth. The AI follows it.
— Paul Poppell, Founder, OpusDraft
For one or two serious projects in flight
BYOK — bring your own API key
Cancel anytime. Your writing stays.
The full system for books and presentations
BYOK — bring your own API key
Cancel anytime. Your writing stays.
For publishers, churches & editorial teams
BYOK — bring your own API key
10 writer seats included
Cancel anytime. Your writing stays.
Lock your canon. Enforce your rules. Write faster without losing your voice.
Start Writing With Control3-day free trial. No credit card.