The disclosure first: we make Charc, so read everything below with that in mind. We’ve tried to write the comparison we’d want to read anyway — the one that starts by admitting these two tools mostly do different jobs, and that at its job, ProWritingAid is excellent.
Different jobs
ProWritingAid is a second pair of eyes, and a sharp one: twenty-five-plus reports over prose you’ve already written, from grammar and sticky sentences to pacing and dialogue tags. Its integrations tell you its worldview — Word, Google Docs, Scrivener, browser extensions. It meets your manuscript wherever it lives, because it was never designed to be the place your manuscript lives.
Charc is that place: the writing, the structure, the world notes, the progress tracking, the page design, the people you write with, and the file that goes to your agent at the end. You could use both, and many writers will. So the question isn’t which one wins. It’s what each is worth to you, and what each asks of you in return.
Where ProWritingAid is stronger
Let’s not pretend otherwise: at prose analysis, ProWritingAid is the deepest tool on the market.
- Twenty-five-plus reports refined over a decade — sticky sentences, echoes, pacing, dialogue tags, sensory language, transitions, clichés, readability. Each one actionable rather than a vague score.
- A real grammar and style engine. Charc has your browser’s spellcheck; ProWritingAid has professional-grade grammar checking tuned for fiction, which understands that dialogue breaks rules on purpose.
- AI critique, if you want it. Chapter Critique and Manuscript Analysis will read your novel and return a developmental report — plot structure, character consistency, pacing across the book — in minutes.
- Integrations everywhere. Word, Google Docs, Scrivener, browser extensions — the red pen comes to you.
If your revision process leans hard on analysis, ProWritingAid earns its reputation. Nothing in Charc replaces it at that job today, and our own manuscript-health report doesn’t come close to that depth. It may never: depth of analysis is their whole company. It’s one of our features.
Where Charc is stronger
Everything that happens before and around the editing pass.
- The book lives here. An outline of acts, chapters, and scenes; character and world-building pages the manuscript can see; a scrap pile so nothing is ever really deleted; progress tracking that feeds itself from your writing instead of asking you to log anything.
- The book gets designed here. Trim sizes, margins, running heads, chapter openings, front matter, print-ready covers with the spine width computed from your page count. ProWritingAid has no notion of a printed page.
- People write together here. Coauthors with live presence and scene locks, editors with their own copies you adopt changes from, alpha readers, read-only links for anyone with no account at all.
- Export to everything. DOCX, PDF (print-ready with bleed), EPUB, Fountain, and a one-file backup of the entire project.
- The essential prose checks, built in, free. Charc’s manuscript health report covers the workhorse basics — overused and filter words, repeated phrases, sentence rhythm, dialogue balance, passive voice, readability — computed instantly, on any draft. It’s a first version and the report says so. But for many writers, these basics are most of what they actually used an analysis tool for.
- Price. ProWritingAid Premium is $120/year, Premium Pro $144/year, or $30 month-to-month (at the time of writing). Charc’s core is free, forever: the workspace, the design tools, the health report, collaboration. Paid plans exist only for higher limits.
The AI question — and where your manuscript goes
This is the part worth slowing down for, because the two tools disagree here, and the disagreement is real.
ProWritingAid’s newest and most impressive features are AI: a Virtual Beta Reader, chapter critique, full manuscript analysis. To do that work, your manuscript is processed by AI systems. For many writers that’s a fine trade and the results are useful. For others — writers with publisher clauses about AI exposure, writers who simply don’t want their unpublished book inside anyone’s model pipeline — it’s a dealbreaker.
So here is where Charc stands:
And the other half of that position: that’s a promise about what we do — not a rule about what you do. Your manuscript is yours. Export it as DOCX and run ProWritingAid over it. Paste a chapter into whatever model you trust for feedback. Writers are finding real value in AI editing tools, and Charc will never get in the way of that choice — clean exports exist precisely so your book can go wherever you decide it goes. The point isn’t that AI tools are wrong. The point is that sending your book to one should be a decision you make, not a default you discover.
Side by side
| Charc | ProWritingAid | |
|---|---|---|
| What it is | Writing workspace | Editing & analysis engine |
| Grammar & style engine | Browser spellcheck | Deep, fiction-aware |
| Analysis reports | The essential basics, free | 25+, refined over a decade |
| AI critique | No — by design | Yes (Premium Pro) |
| Manuscript privacy | Never leaves your account | Processed for analysis |
| Outline & structure | Acts, chapters, scenes | None |
| Characters & world notes | Full entity system | None |
| Book design & covers | Formats, front matter, print covers | None |
| Collaboration | Coauthors, editors, alpha readers | Via Word/Docs tooling |
| Export | DOCX, PDF, EPUB, Fountain, backup | Limited |
| Price | Free core; paid tiers for limits | $120–144/yr, $399 lifetime |
Using both
The workflow a lot of writers will actually want:
- Write the book in Charc — draft, structure, track, design.
- When a draft is ready for a hard edit, export a DOCX.
- Run your ProWritingAid pass there — or any tool you trust.
- Bring the revisions back and keep going.
That’s it. Ten seconds of export. Their whole integration strategy assumes the book lives somewhere else. We’re happy to be the somewhere else.
Who should buy ProWritingAid
- You revise heavily against analysis and want the deepest reports made.
- You want AI critique of a full manuscript and are comfortable with the processing that requires.
- Your writing home is already Word, Docs, or Scrivener, and you want the red pen to come to you.
Who should try Charc
- You want one place where the whole book lives — words, world, design, people — instead of a folder of files and a subscription for each job.
- You want the essential prose checks without $120 a year.
- You care about where your unpublished manuscript travels, and want “nowhere” to be the default — with every export open when you choose otherwise.
Trying it costs nothing — literally
Charc is free — not a trial. Write a chapter, run the health report, export a DOCX, and if ProWritingAid is part of your process, point it at that file. The two of us will get along fine.