Comparing Grammarly vs ProWritingAid only makes sense once you decide whether you need correctness, style depth or brevity.
Grammarly, ProWritingAid and Hemingway are often lumped together as ‘grammar checkers’, which is like calling a scalpel, a Swiss Army knife and a pair of scissors ‘cutting tools’. They solve different problems, and picking the wrong one means paying for reports you never read.
We ran the same four texts through all three: a client email, a blog introduction, an academic paragraph and a page of fiction dialogue. We counted real issues caught, false positives, and how long it took to accept or reject the suggestions.
Quick Verdict
| Tool | Best for | Free tier | Paid price |
|---|---|---|---|
| Grammarly | Everyday correctness and tone | Yes, solid | ~$12/mo |
| ProWritingAid | Long-form style and fiction | Yes, limited | ~$10/mo |
| Hemingway | Cutting clutter and readability | Yes, web | ~$20 one-time |
How We Tested
Each tool saw identical text with deliberately planted problems: subject-verb disagreement, a dangling modifier, repeated sentence openings, passive voice, adverb stacking, a 42-word sentence, and two stylistic choices that were intentional. We scored detection, precision, explanation quality and the editing burden created by noisy suggestions.
How We Scored the Same Four Texts
We gave each tool the same four texts: a 180-word client email with two buried errors, a 1,000-word report with passive voice and repeated points, a page of fiction with dialogue tags, and a dense academic paragraph with long sentences and jargon.
True positives. We counted every suggestion that fixed a real error or genuinely improved the sentence. A missed comma splice counted against the tool; a correct but unnecessary comma did not.
False positives. We counted every suggestion we rejected because it changed the meaning, flattened the voice or applied a rule that did not fit the genre. Fiction produced the most false positives, especially around sentence fragments used for effect.
Time to edit. We timed the pass from opening the text to a version we would send. A tool that found more issues but required constant triage could lose to a quieter tool that caught the important ones.
Explanation quality. Grammarly usually explains a suggestion in one sentence. ProWritingAid’s reports explain patterns across the document. Hemingway explains almost nothing, which is fine for a clarity pass and frustrating for learning.
Voice preservation. We asked whether the edited version still sounded like the writer. Grammarly’s tone suggestions were the easiest to ignore; ProWritingAid’s style reports were the most likely to push toward a house style; Hemingway’s brevity could flatten deliberate rhythm.
We also checked where each tool worked: browser, Google Docs, Word, Outlook and macOS. A tool that is excellent in one editor and absent from the other is a part-time tool, and the best choice depends on where your drafts actually live.
Limits: four texts cannot represent every genre, and our judgements about voice are subjective. The scoring is a record of what we noticed, not a laboratory measurement.
1. Grammarly
Best for: Anyone who writes email, documents and web copy all day.
Grammarly is the best general-purpose writing assistant in the category. It catches real errors in real time, explains them briefly, adapts tone by audience, and appears almost everywhere: browser, Word, Google Docs, email clients and mobile keyboards.
Its weakness is depth. It will polish a sentence without telling you the paragraph is doing nothing, and its style suggestions can sand down a distinctive voice. The free tier is genuinely useful; the paid tier is where tone and full-sentence rewrites live.
Pricing: Free tier; Premium around $12/month billed annually; Business per seat. Full Grammarly review.
2. ProWritingAid
Best for: Novelists, long-form writers and anyone editing their own drafts.
ProWritingAid is an editor’s toolkit rather than a proofreader. Its reports cover pacing, dialogue tags, sticky sentences, repeated words, readability and consistency — the things that matter at 80,000 words. The desktop app works offline, which no browser-first rival matches.
The interface is dense and the reports can overwhelm. It flags stylistic preferences as problems, so you need judgment. Grammar suggestions trail Grammarly on conversational text.
Pricing: Free tier with limited checks; Premium around $10/month billed annually, lifetime option available. Full ProWritingAid review.
3. Hemingway
Best for: Trimming bloated drafts into readable prose.
Hemingway does one thing well: it highlights long sentences, passive constructions, adverbs and complicated phrasing, then gives you a grade level. For blog posts, landing pages and internal comms, that constraint is liberating.
It is not a grammar checker. It misses basic errors, has no integrations, and the product has aged — the desktop app is a one-time purchase but updates are rare. Use it as a final pass, not a writing environment.
Pricing: Free web editor; desktop app around $20 one-time. Full Hemingway review.
Head-to-Head
| Criterion | Grammarly | ProWritingAid | Hemingway |
|---|---|---|---|
| Grammar accuracy | Excellent | Good | Weak |
| Style depth | Moderate | Excellent | Narrow but useful |
| Fiction support | Limited | Strong | None |
| Integrations | Excellent | Good | None |
| False positives | Low–moderate | Moderate–high | Low (but blunt) |
| Offline use | No | Yes, desktop | Yes, desktop |
| Free tier | Best in class | Limited | Yes |
The False-Positive Problem
A tool that flags 40 issues when 12 are real costs you more time than it saves. In our tests Grammarly had the best signal-to-noise ratio on business writing, ProWritingAid on long-form prose, and Hemingway on sentence length. The mistake is treating every coloured highlight as a command.
Which Should You Use?
- You write email and documents for work: Grammarly, free first.
- You write fiction or long articles: ProWritingAid, with Hemingway for a final trim.
- You write short marketing copy: Hemingway plus a human read-through.
- You need one tool for a team: Grammarly Business for consistent tone and admin controls.
- You need offline editing: ProWritingAid desktop.
The Bottom Line
If you only pay for one, make it Grammarly — it catches the errors that embarrass you. If writing is the work, add ProWritingAid for structure and Hemingway for discipline. None of them will give you something worth saying. See more in our writing tools directory.
How to Combine All Three in a 30-Minute Edit
You do not have to choose. The tools are complementary if you use them in the right order, and the whole pass takes about half an hour for a 1,500-word article.
Minutes 0–10 — structure with Hemingway. Paste the draft and fix long sentences, passive constructions and adverb stacking. Ignore the readability grade as a target; use it as a smoke detector. Do not accept changes that flatten a deliberate rhythm.
Minutes 10–20 — patterns with ProWritingAid. Run the sticky-sentence, repeated-word and pacing reports. Look for clusters rather than individual flags: three sentences starting the same way is a real problem, one adverb is not.
Minutes 20–28 — proof with Grammarly. Catch the errors the others missed, check tone for the audience, and accept only the suggestions that preserve your voice. This is the pass that protects you from embarrassment, not the one that improves the argument.
Minutes 28–30 — read it aloud. No tool catches a sentence that is grammatically perfect and impossible to say. If you run out of breath, cut.
One warning: don’t run all three on the same sentence simultaneously. Conflicting suggestions produce a bland compromise that sounds like nobody wrote it.
How to Choose Between Grammarly, ProWritingAid and Hemingway
The Grammarly vs ProWritingAid debate usually starts with a feature table and ends with a writing habit. These tools solve different problems, and the right choice depends on what you write, where you write it and how much editing you are willing to learn.
1. What kind of writing fills your week? Email, proposals and reports reward Grammarly’s real-time correctness and tone. Fiction, essays and long-form journalism reward ProWritingAid’s deeper style reports. A tight memo or a landing page benefits from Hemingway’s single-minded focus on sentence length and clutter.
2. Do you want corrections or a diagnosis? Grammarly fixes as you type and explains most suggestions in a sentence. ProWritingAid produces a report: passive voice, sticky sentences, pacing, dialogue tags, repeats. Hemingway grades readability and highlights the sentences doing the damage. Diagnosis takes longer and teaches more.
3. Where do you actually write? Check the integrations that matter: Google Docs, Word, Outlook, browsers, macOS apps, Scrivener and mobile keyboards. A better tool that does not appear where you write will lose to a worse tool that does.
4. Do you write with a team? Style guides, shared dictionaries, admin controls and SSO matter more than another grammar rule. Grammarly’s team plans are mature; ProWritingAid’s are improving. If five people edit the same brand voice, a shared style guide is the feature to test.
5. What happens to your text? Check retention and training terms, especially for client work, unpublished fiction or legal documents. Business plans differ from consumer plans, and the difference is not always obvious on the pricing page.
6. Which pricing model fits? Grammarly and ProWritingAid are subscriptions; ProWritingAid also sells a lifetime licence. Hemingway is a one-time purchase with a free web version. If you write seasonally, a lifetime or one-time tool can beat a subscription you forget to cancel.
Run the same four texts through each tool: a client email, a 1,000-word report, a page of fiction and a dense academic paragraph. Count how many suggestions you accept, how many you dismiss and how long the edit takes. The best tool is the one whose false positives you can tolerate, because every wrong suggestion costs attention.
What They Cost Over Three Years
At list prices, Grammarly costs roughly $144 a year, ProWritingAid roughly $120 a year and Hemingway $20 once. Over three years that is about $432, $360 and $20 before discounts.
The comparison changes with usage. A novelist who edits daily gets far more from ProWritingAid’s reports than from a grammar checker. A consultant who writes emails all day gets more from Grammarly’s tone and clarity suggestions. A blogger who needs a quick readability pass may not need a subscription at all.
Team plans add seats, admin and a shared style guide. Price those against the cost of one inconsistent client deliverable, not against the consumer plan. And include the time cost of false positives: a tool that flags thirty questionable items a day is not free, even at $10 a month.
One Paragraph, Three Tools: A Sample Edit
Take this sentence: “The report was prepared by the team in order to provide an overview of the results that were achieved.”
Grammarly flags the passive construction, suggests “to” instead of “in order to” and tightens the phrasing. ProWritingAid’s style report adds the passive-voice percentage and flags the sticky sentence, which is useful if this is one of many. Hemingway highlights the length, suggests a shorter version and lowers the readability grade.
A human edit might produce: “The team prepared the report to summarise the results.” That is shorter, active and clearer. All three tools can nudge you toward it; none of them knows whether the passive voice was deliberate, which is why the final decision stays with the writer.
The lesson is not that one tool wins. It is that Grammarly is fastest at the sentence level, ProWritingAid is strongest at the document level and Hemingway is best at the one thing it does. Choose the level where your writing actually breaks down.
Five Mistakes Writers Make With Grammar Tools
- Accepting every suggestion. A green underline is not a command. Read the reason first.
- Ignoring genre. Fiction, legal writing and marketing copy have different rules.
- Using Hemingway for everything. Short sentences are not always better; sometimes they are just choppy.
- No style guide. Teams need shared decisions about tone, spelling and formatting.
- Chasing the score. A 100 readability grade is not the goal; a clear argument is.
The Grammarly vs ProWritingAid decision is easier when you stop looking for a winner and start looking for the editing pass you skip. Buy the tool that makes that pass happen.
Official Sites and Further Reading
Check current plans, lifetime offers and privacy terms at the source.
Grammarly vs ProWritingAid vs Hemingway: FAQ
Is free Grammarly enough?
For everyday email and social posts, usually yes. You need Premium for tone adjustment, full-sentence rewrites and advanced clarity suggestions.
Which is better for fiction writers?
ProWritingAid, comfortably. Dialogue, pacing and sticky-sentence reports are built for long manuscripts; Grammarly is a line editor by comparison.
Does Hemingway still get updates?
Rarely. It remains useful because the core idea has not changed, but do not expect new integrations or modern AI features.
Do these tools work in Google Docs and Word?
Grammarly and ProWritingAid both do, with browser extensions and native add-ins. Hemingway requires copy-paste or its desktop app.
Will using a grammar checker make my writing sound generic?
It can if you accept every suggestion. Use it to remove errors, then restore the sentences that carry your voice.
