Twig vs. ProWritingAid Review: Which Writing Tool Will Level Up Your Manuscript?

You've finished the first draft of your book and now comes the hard part: turning your rough draft into a polished manuscript ready for readers. But how do you tackle the daunting revision process? And might there perhaps be any AI editing tools to make it easier?

In fact, there are! This is where book editing tools like Twig and ProWritingAid promise to help. Both are built specifically for creative writers, but they approach the editing process from different angles.

In this review, we'll compare Twig and ProWritingAid to help you figure out which tool (or combination of tools) will best serve your specific writing needs.

Whether you're working on a novel, memoir, short story, or nonfiction book, by the end of this review, you'll know the exact pros and cons of each to help you make the right choice. (The write choice? Sorry!)

I've personally tested both tools extensively. Also, full transparency: we created Twig, so this review is a bit biased. Links to ProWritingAid are affiliate links, which won't affect your price on either tool.

How I Personally Use These Tools

If you’re not familiar, ProWritingAid is a comprehensive grammar and style checker that has recently added AI-powered content-level critiques.

Twig, on the other hand, was built from the ground up as a developmental editor, focusing exclusively on the big-picture elements of your manuscript while all but ignoring sentence-level feedback.

As a writer of over 20 books and an editor myself, I've integrated both Twig and ProWritingAid into different phases of my workflow—but for very different purposes.

There are three phases in the writing process:

1. Write a very bad draft. As Anne Lamott says, first drafts are shitty. The goal isn't to write a perfect first draft. It's to write quickly and explore your story without getting caught up in the revision mindset.
2. Revise for structure. This involves fixing story arcs, developing characters, adding research, moving material around, and sometimes adding or cutting entire chapters.
3. Polish to perfection. You don't want to polish chapters you're eventually going to delete, so sentence-by-sentence rewrites happen only at the very end.

Here's how each tool fits in: I turn ProWritingAid off until I'm in phase 3. I don't even want to see a blue or red line until the structural work is done because it will drag me back into revision mode.

Twig on the other hand is perfect for phase 2. When I finish the latest draft of a book, I upload it to Twig and within 30 minutes I have actionable next steps on plot structure, character development, pacing, and more, including a prioritized list of what to tackle first. That alone saves an enormous amount time.

ProWritingAid has also added AI-powered manuscript critique features (Chapter Critiques, Manuscript Analysis, Virtual Beta Reader, and Marketability Analysis), and while they can definitely fit into my phase 2 revision process, I personally prefer Twig for that aspect, finding it a cleaner and much more helpful experience. More on that below.

What is Twig?

Twig is an AI-powered developmental editing tool designed specifically for authors working on full-length manuscripts (novels, memoirs, nonfiction books, and short stories).

Twig analyzes your entire manuscript to give big-picture feedback, the same kind of feedback you'd typically get from a human developmental editor.

So if you’re working on a novel, you’ll get feedback on story structure, character development, plot, pacing, and thematic elements. If you’re working on a nonfiction book,

Within approximately 30 minutes of uploading your manuscript, Twig gives you:

1. An Editorial Letter offering comprehensive feedback on your manuscript's strengths and weaknesses
2. A Revision Plan with specific, actionable steps to get your book publish-ready, prioritized by what matters most
3. Chapter-by-Chapter Notes analyzing each section individually

Its goal is to provide the same depth of professional developmental editing at a fraction of the cost, around $150 for a 50,000-word manuscript, versus $1,000–$3,000 for a human developmental editor, all complete within 30 minutes or less.

What is ProWritingAid?

ProWritingAid is a comprehensive grammar checker and style editor designed to improve your writing at the sentence and paragraph level. It combines grammar checking, style analysis, and 20+ writing reports to help you eliminate errors and enhance your overall writing quality.

I’ve been using ProWritingAid for almost a decade. It’s my favorite grammar checker, and a great way to polish your manuscript before you publish. While it can be used by writers of all types, it was originally made for creative writers, and so it’s a great tool for anyone working on books.

More recently, ProWritingAid has added AI-powered content-level critique features, including:

• Chapter Critiques. Structural feedback on your book, one chapter at a time.
• Manuscript Analysis. A structural overview and feedback on your full manuscript, including strengths and areas to consider revision.
• Virtual Beta Reader. Simulates feedback from an actual reader, covering emotional engagement, where interest peaks and drops, what feels fresh vs. clichéd, and first impressions of genre fit.
• Marketability Analysis. Generates a story synopsis, an agent query letter, and a book cover designer brief based on your manuscript.

These features go well beyond style and grammar into developmental territory and even beyond. We'll look at them in more in detail below.

Twig vs. ProWritingAid: The Key Differences

Before diving into specific features, let’s talk about how these tools are positioned.

Twig was built from scratch as a developmental editing tool. That's the only thing it does, and it does it with significant depth: a 40+ page report covering up to 27 specialized analyses, a prioritized Revision Plan, and chapter-by-chapter notes.

ProWritingAid started as a grammar and style checker, and it's rivals Grammarly as best-in-class at that. But it has now added a suite of AI-powered content critique tools that venture into developmental territory. So are they direct competitors? Partly. But three important distinctions remain:

1. ProWritingAid's dev editing tools cost extra. They're not included in any subscription. They require separate "Manuscript Analysiss Credit" purchases. Each tool (Manuscript Analysis, Virtual Beta Reader, or Marketability Analysis) costs one credit. If you want all three, you're looking at roughly $150 in credits on top of your monthly or annual subscription. That's comparable to Twig's pricing, but Twig gives you everything in one report.
2. ProWritingAid produces 12 pages of developmental feedback. Twig produces 40+. More is not necessarily better, but the level of detail in Twig's report is significant.
3. ProWritingAid includes a lot of book description elements. Like who your characters are, your book’s themes, an outline, and table of contents. Things you might already know about your book. Twig focuses directly on what’s working, what’s not, and how to fix it.
4. ProWritingAid has no Revision Plan. ProWritingAid tells you what's working and what’s not wrong. Twig tells you what's working and what’s not, and gives you a step by step process to fix them.
5. Twig includes Chapter-by-Chapter feedback. The broad overview is relatively comparable, but where Twig gets into much more detail is in the chapter notes, where the edit gives specific feedback on each chapter of your book.

One way to think of it is that ProWritingAid is a Swiss Army knife, it does many things well, including some developmental work.

Twig is a scalpel, built and optimized for one specific job.

Main Features: How Twig and ProWritingAid Stack Up

Now, let’s talk about the specific features between Twig and ProWritingAid and how they compare, starting with developmental editing.

Developmental Editing Capabilities

How do the two editors compare in developmental editing? Let's take a look:

Twig's Approach to Developmental Editing

Twig's primary focus is developmental editing.

The platform performs multiple detailed passes on your manuscript before ever delivering feedback. Imagine an editor reading your manuscript 20+ times, each time with a specific lens, like voice, stakes, POV, research, plot structure, or dialogue.

Each type of book has a different set of analyses, so it treats your nonfiction how-to book differently than a memoir about your life or your cozy mystery novel.

You upload your complete manuscript as a .docx file, select your manuscript type, and Twig processes it in between 10 and 30 minutes.

The Editorial Letter prioritizes issues as Critical, Important, or Minor, so you know where to focus revision energy first.

The Revision Plan goes further. Rather than leaving you with a list of problems, it gives you specific, actionable guidance on what to fix and where. When Twig identified that my protagonist was flat, it didn't just flag the issue, it named the specific chapters where the problem was most acute and offered concrete suggestions for how to address it.

The report runs 40+ pages. There's also an optional "Roast" feature that delivers honest feedback with a bit of dark humor, which I find to be surprisingly useful for cutting through your own blind spots.

ProWritingAid's Developmental Features

ProWritingAid now offers four AI-powered content critique tools.

Manuscript Analysis analyzes your entire book across five key areas: About My Story, Narrative Themes, Plot & Structure, Characters, and Setting. It auto-detects your genre, handles manuscripts up to 300,000 words, and processes a 100,000-word novel in about 7 minutes. The output, for me, was around 12 pages.

Virtual Beta Reader simulates feedback from an actual reader. It covers four categories: General Impressions (genre fit, character presence, emotional journey), Reading Experience (engagement peaks and drop-off risks), Reader Insights (what feels fresh or cliché), and Marketing Ideas (comp titles, potential cover copy).

Marketability Analysis is a unique angle Twig doesn't currently match. It generates a story synopsis, an agent query letter, and a book cover designer brief—useful if you're planning to query agents or self-publish.

Chapter Critique provides instant feedback on a single chapter (500–6,000 words), including a beat-level outline and notes on structure, dialogue, and style.

None of these, except for the Chapter Critique, are included in any ProWritingAid subscription (Chapter Critiques require “sparks” and you have a limit depending on your account). For the rest, each tool requires a separate Manuscript Analyses Credit. To get Manuscript Analysis, Virtual Beta Reader, and Marketability Analysis together cost roughly $150 on top of your subscription.

The other challenge is the experience of actually using these features. ProWritingAid's interface was built for real-time grammar checking, and the developmental critique tools can feel a little buried inside it.

Finding Manuscript Analysis requires navigating menus that aren't always intuitive, not to mention the fact that there are so many reports it can feel overwhelming.

I lost my critique at one point and spent several minutes hunting for it, even wondering if I would have to buy another manuscript credit to run it again. I did end up finding it, but it was buried in the “Feedback History,” which wasn’t the easiest to find.

For authors who aren't comfortable with complex software, there's a real risk they'd never find these features at all.

Once you do find the critique, there are genuinely useful UI elements: you can add specific issues to a to-do list, dismiss irrelevant feedback, and click through to see how different sections interact. Issues are ranked similarly to Twig: Working Well, Major Concern, Concern, Minor Concern.

You can even interact with each element, adding it to your “To Do” list or setting it to ignore. That’s really cool!

The core limitation is there's no Revision Plan. ProWritingAid's manuscript critique tells you what's wrong, but doesn't give you a clear path through the revision. You get more information, but you don't always get the right information in the right order.

Grammar and Style Analysis

So that's dev editing (we like Twig for that obviously, but ProWritingAid does have some very cool features). Now, how do the two editors stack up for Grammar and Style editing? Hint: ProWritingAid wins this one!

Twig's Grammar and Style Features

Twig intentionally avoids grammar and line-level style issues. Its purpose is structural and creative feedback, and it acknowledges this upfront—recommending a dedicated grammar checker like ProWritingAid as a complementary tool for later editing stages.

ProWritingAid's Grammar and Style Analysis

This is where ProWritingAid is best-in-class shines. Its real-time grammar and style feedback is comprehensive:

• Grammar errors and spelling mistakes
• Passive voice identification
• Adverb overuse
• Repeated phrases and words
• Sentence structure variety
• Readability scores
• Clichés and redundancies
• Vague and abstract words

Suggestions can also be tailored to the specific context of your writing type. You can customize the sensitivity of style checks based on your genre (loosening grammar rules for dialogue, for example).

Reporting and Analytics

Finally, what about th reports you get, including other reports not associated with the ones we talked about above?

Twig's Reporting Features

Twig's reporting is focused on actionable insight. The three main deliverables are:

1. Editorial Letter: A comprehensive overview of strengths and weaknesses, prioritized by critical importance
2. Revision Plan: A step-by-step guide with specific chapter locations and concrete suggestions
3. Chapter-by-Chapter Notes: Detailed analysis of each chapter

The total report runs 40+ pages. What sets it apart is specificity: not "improve your characters" but "your protagonist lacks clear motivation in chapters 3–5, which undermines the decision they make in chapter 7." The optional Roast feature delivers the same analysis with more directness and dark humor.

ProWritingAid's Reporting Features

ProWritingAid offers 20+ reports covering Style, Grammar, Overused Words, Readability, Consistency, Dialogue Tags, Pacing, and Sticky Sentences. These remain excellent.

Its newer content critique reports add 12 pages of developmental feedback with useful elements: ranked issues (Working Well, Major Concern, Concern, Minor Concern), to-do list integration, and dismissible feedback. The Virtual Beta Reader's Marketing Ideas section—with comp titles and query letter hooks—is a genuinely novel feature with no equivalent in Twig.

ProWritingAid certainly wins for breadth of information. But accessing that information can cause significant overwhelm. Useful, but you might need to prepare yourself before diving in.

And this is actually key, because as we talked about there are 3 different phases of the writing process: fast drafting, structural revision, and polish. ProWritingAid smashes all three of these together in one tool, and if you’re not prepared to handle the distraction and overwhelm, you could easily get sucked into fixing comma splices and other phase 3 work when you’re still trying to get your original story on paper in phase 1.

Pros and Cons: Twig vs. ProWritingAid

Let’s get down to the details on how Twig and ProWritingAid stack up:

Twig Pros

• 40+ page report with up to 27 specialized analyses
• Revision Plan: prioritized, actionable steps with specific chapter references
• Chapter-by-chapter analysis pinpoints problem areas precisely
• Fast turnaround (~30 minutes for a full manuscript)
• Built exclusively for book-length manuscripts—purpose-built, nothing bolted on
• ~$150 for 50k words vs. $1,000–$3,000 for a human developmental editor
• 100% money-back guarantee
• Strong privacy commitment: your writing is never used to train AI
• "The Roast" feature offers brutally honest feedback with humor

Twig Cons

• No direct integration with word processors
• No grammar or sentence-level editing
• Limited to .docx file format
• Newer platform with fewer user reviews
• One-time analysis rather than ongoing support
• No free trial (minimum $30 for 10,000 words)
• Not suitable for shorter content like articles or blog posts

ProWritingAid Pros

• Best-in-class grammar and style checking with 20+ detailed reports
• Extensive integrations (Word, Google Docs, Scrivener, browsers)
• Real-time editing suggestions as you write
• Contextual thesaurus for precise word choice
• Manuscript Analysis, Virtual Beta Reader, and Marketability Analysis now available
• Marketability Analysis generates query letters, synopses, and cover briefs (no Twig equivalent)
• Interactive critique UI: add issues to to-do list, dismiss feedback, click through sections
• Free tier available (limited to 500 words, no dev editing features)

ProWritingAid Cons

• Dev editing tools (Manuscript Analysis, Virtual Beta Reader, Marketability Analysis) are NOT included in any subscription—each requires a separate Story Credit (~$50 each)
• Possibly overwhelming user interface
• 12 pages of developmental feedback vs. Twig's 40+
• No Revision Plan, identifies problems without a prioritized action sequence
• Prone to information overload: many issues flagged, not all equally important

Final Verdict: Should You Choose Twig or ProWritingAid?

The question isn't really which tool is better. It's which tool (or combination) best serves your needs at each stage of writing.

If you've finished a book-length manuscript and need substantive feedback on plot, structure, character development, and overall narrative effectiveness, Twig is the clear choice. It produces deeper but at the same time more actionable feedback, gives you a prioritized revision plan, and was built exclusively for this purpose.

The experience is cleaner, the output is more practical, and the pricing is competitive, especially compared to human editors.

If you want real-time grammar and style support throughout the writing process (or at the very least, in your phase 3 polish process) ProWritingAid is unmatched. Its core editing features are genuinely excellent, and the integrations with Word, Google Docs, and Scrivener make it easy to use wherever you write.

ProWritingAid's developmental features are worth experimenting with, and if you already have a subscription, it wouldn’t hurt to use the chapter critique or even opt in to a manuscript critique. But they come with real UX and process friction.

For most authors working on a book, the ideal workflow is to use both: Twig early in revision for structural feedback, ProWritingAid later for polishing your prose. They're not so much competitors as serving different phases of the same process.

If you can only choose one: pick based on where you are. Early in revision? Twig. Polishing a nearly-finished manuscript? ProWritingAid.

How about you? Have you used Twig or ProWritingAid for developmental editing?

‍