AI developmental editor for book authors
Penmark Studio is the editing studio for novelists, memoirists and narrative nonfiction authors with a manuscript in hand. Six editorial reviews — developmental, line, continuity, voice, chapter and reader experience — returned in under two minutes, with ranked action items you can actually work through.
A freelance developmental edit on an 80,000-word manuscript runs $1,500–$3,000 for one pass and takes two to six weeks. Penmark starts at $15/month and you can run the pass again tonight.
Not for everyone: Penmark does not draft, ghostwrite or co-write. If you want AI to produce prose, this is the wrong tool. It is built for authors who have already done the writing and need to know what to fix.
Chapter 3 · 2,140 words
The morning after the storm, Marta found the back door standing open and the kitchen floor pale with snow. She did not call out. She had stopped calling out years ago.
Whatever it was had taken the bread and left the knife. Whatever it was had sat at her table.
She put the kettle on and watched her own hands. They were not shaking, which surprised her…
Beta readers give you vibes, not direction.
Developmental editors cost thousands and take weeks.
You lose the thread across chapters and drafts.
Pacing, voice, and line quality on a single chapter. Recommendations ranked by impact.
Character, setting, and timeline consistency across any chapters you select. Every inconsistency flagged with a fix.
Where your voice wanders between chapters and what to adjust.
Full-manuscript review against bestseller standards in your genre.
Word-level precision, cut-the-fat candidates, and rhythm notes on a single chapter.
Claude reads as your target audience and reports where attention drops and where it spikes.
Every save preserved, every revision traceable.
Mon · 9:14 AM
Feedback from every review becomes work you can mark resolved as you revise.
Open feedback, weekly progress, and chapters that still need work — all in one view.
Open items
12
Resolved this week
5
Chapters needing work
3
Export to .docx, .md, or .pdf when you're ready to send.
Chapter 3
The morning after the storm, Marta found the back door standing open and the kitchen floor pale with snow. She did not call out. She had stopped calling out years ago.
Whatever it was had taken the bread and left the knife. Whatever it was had sat at her table.
Claude reviews your work with the standards of editors at Knopf, FSG, Riverhead, and Scribner. It knows your voice, your audience, and the books you want yours to sit beside. It quotes passages. It ranks recommendations. It never pads with generic praise.
Chapter 3 opens on the wrong beat. You've buried the inciting moment under two pages of weather. Cut to line 47 and the chapter sharpens. The closing image earns its weight.
It never writes a word of your manuscript. Penmark returns notes, quoted passages and ranked action items — you decide what to change. The Voice Stability review exists to catch drift in the voice you already have, not to replace it.
Only you. Your work is scoped to your account, we do not train models on it, and we do not sell or share it. Export everything as a ZIP or delete your account and its contents whenever you want.
No. It replaces the three or four expensive passes you would have burned on problems you could have found yourself. Your human editor gets a stronger manuscript and bills you for less.
Penmark Studio is early. We are opening to a small group of authors first and building the studio around what their manuscripts actually need. We would rather say that plainly than invent a wall of five-star quotes.
Built for authors writing
Weighing the alternatives? Penmark vs AutoCrit · Penmark vs ProWritingAid
Pricing
Plans from $15/month. No credits, no per-review charges. Founding members lock in $19/month for life.