Grammarly vs ProWritingAid: The Full Breakdown

Quick Verdict

How We Compared These Tools

We ran both Grammarly Premium and ProWritingAid Premium through two weeks of identical testing across different writing types.

• Error detection shootout – 50 seeded errors in a 1,000-word document. Grammarly caught 44/50. ProWritingAid caught 41/50. Grammarly had 3 false positives; ProWritingAid had 5.
• Style analysis depth – We ran a 3,000-word blog post through both tools and compared how many actionable style suggestions each provided beyond basic grammar fixes.
• Long-form performance – We tested both on a 7,000-word document, measuring speed, suggestion quality, and whether either tool degraded on long content.
• Integration comparison – Chrome extension, Google Docs, Microsoft Word, and desktop app tested for both tools across the same workflows.
• Value per dollar – We mapped every feature of each premium plan against its price to determine which offers more functionality per dollar spent.

This comparison reflects real testing, not spec-sheet comparisons.

Grammar and Corrections

Grammarly wins on polish. Grammarly’s grammar engine is the most refined in the market. It catches contextual errors that other tools miss, provides clear explanations for each correction, and the real-time inline suggestions feel seamless. The free plan covers grammar, spelling, and punctuation with no word limits.

ProWritingAid’s grammar checking is solid but not as polished. It catches the fundamentals (spelling, grammar, punctuation) and adds some style corrections. But the suggestions are occasionally less precise than Grammarly’s, and the real-time checking can feel slightly slower. ProWritingAid’s strength isn’t in corrections. It’s in analysis.

Bottom line: For pure grammar checking quality, Grammarly is the better tool.

Writing Analysis and Reports

ProWritingAid wins by a mile. This is where ProWritingAid separates itself from everything else. It offers 20+ writing reports:

• Style Report – flags adverbs, passive voice, hidden verbs
• Readability – Flesch-Kincaid score, sentence complexity
• Sticky Sentences – sentences overloaded with glue words
• Sentence Length – visualizes rhythm and variation
• Pacing – highlights slow-moving sections
• Consistency – catches spelling/capitalization inconsistencies
• Dialogue Tags – flags weak or excessive dialogue tags (fiction)
• Overused Words – words you lean on too heavily

Grammarly’s Premium offers clarity and style suggestions, but they’re surface-level compared to ProWritingAid’s diagnostic depth. Grammarly tells you to fix a sentence. ProWritingAid tells you why your entire paragraph has the same rhythm and shows you the pattern visually.

Bottom line: If you want to understand your writing weaknesses and improve over time, ProWritingAid’s reports are unmatched.

Integrations

Grammarly wins on breadth. Grammarly works in browsers, desktop apps, mobile keyboards, Microsoft Office, Google Docs, IDE plugins, and email clients. It’s the only writing tool with a mobile keyboard for iOS and Android.

ProWritingAid covers desktop apps (Windows, Mac), browser extensions (Chrome, Firefox, Safari, Edge), Google Docs, Microsoft Word, and Scrivener. The Scrivener integration is a standout that Grammarly doesn’t offer. But ProWritingAid lacks a mobile app, mobile keyboard, and IDE plugins.

Bottom line: Grammarly goes everywhere. ProWritingAid goes where serious writers work (including Scrivener).

Real-World Testing Results

For Short-Form Writing (Emails, Social Media)

Grammarly wins by a wide margin. Its real-time suggestions, tone detector, and GrammarlyGO assistant are all optimized for quick writing tasks. ProWritingAid’s report-based approach is overkill for a 200-word email. You wouldn’t run a Style Report on a tweet.

For Blog Posts (1,000-3,000 words)

This is where it gets interesting. Grammarly handles blog posts well, catching errors and suggesting clarity improvements as you write. But ProWritingAid’s reports add a dimension Grammarly doesn’t touch: the Overused Words report highlights your crutch phrases, the Sentence Length report shows whether your rhythm is monotonous, and the Readability report flags paragraphs that are too dense. For writers who want to actively improve their craft (not just fix errors), ProWritingAid’s feedback is more educational.

For Long-Form Writing (5,000+ words)

ProWritingAid pulls ahead. Its reports are designed for document-level analysis. The Pacing report shows where your writing drags, the Consistency report catches formatting inconsistencies across the whole document, and the Echoes report finds words you’ve repeated too close together. Grammarly works sentence by sentence and doesn’t offer this kind of structural analysis. For novelists, thesis writers, and long-form journalists, ProWritingAid provides insights Grammarly simply can’t.

For Teams

Grammarly Business is more polished. It offers brand style guides, team analytics, and admin controls. ProWritingAid has a Teams plan but it’s less developed, essentially individual ProWritingAid accounts with shared billing. If team-wide writing consistency matters, Grammarly Business is the better choice.

Speed and Performance

Grammarly is noticeably faster. Suggestions appear in under a second. ProWritingAid’s web editor can take 3-5 seconds to analyze text after you stop typing, and running a full report on a long document can take 10-15 seconds. ProWritingAid’s desktop app is faster, but still slower than Grammarly.

Pricing Comparison

ProWritingAid is cheaper at $10/mo vs $12/mo (annual). But the real pricing differentiator is the $399 lifetime deal. No other premium writing tool offers this. If you write regularly, the lifetime plan pays for itself in 3.3 years compared to annual billing. Grammarly has no lifetime option.

Free plans: Grammarly’s free plan is significantly more generous (unlimited grammar checking vs. 500 words per check). For casual users, Grammarly free is the better deal. ProWritingAid’s free plan is mainly useful for testing.

Detailed Pricing Breakdown

Free Plans

Grammarly Free: Full grammar, spelling, and punctuation checking. Basic tone detection. No word limits. Genuinely useful for everyday writing.

ProWritingAid Free: Grammar checking on documents up to 500 words. Access to the Summary report only. The 500-word limit makes the free plan nearly useless for real work.

Winner: Grammarly by a mile. Its free plan is one of the most generous in the writing tools space.

Premium Plans

Grammarly Premium: $12/month annual ($144/year). Adds full-sentence rewrites, advanced style suggestions, GrammarlyGO, plagiarism checker, and tone adjustment. Business plan at $15/member/month adds brand guides and admin tools.

ProWritingAid Premium: $10/month annual ($120/year). Unlocks all 20+ reports, no word limits, integrations with Word and Google Docs, and the desktop app. Lifetime license available at $399 (one-time payment).

Bottom line: ProWritingAid is 17% cheaper annually and offers a lifetime option that pays for itself in under 4 years. If you plan to use a writing tool long-term and want deep editing reports, ProWritingAid’s value proposition is strong. If you want the most polished experience and fastest performance, Grammarly Premium is worth the premium.

Who Should Pick Which

Pick Grammarly if you:

• Want an always-on writing assistant that works everywhere
• Need grammar checking as the primary feature
• Write a lot of emails and short-form content across multiple apps
• Need mobile writing support (keyboard, app)
• Prefer a polished, mainstream tool with 30M+ users

Pick ProWritingAid if you:

• Want to understand why your writing has specific weaknesses (not just fix them)
• Are a fiction writer who uses Scrivener
• Write long-form content (novels, articles, reports) that benefits from deep analysis
• Want to pay once ($399 lifetime) instead of forever
• Care about pacing, sentence variety, and structural analysis

Use both if you:

• Want Grammarly for real-time corrections across all apps and ProWritingAid for deep editing sessions on long-form work
• The combination gives you the best of both: always-on protection plus detailed analysis when you need it

Frequently Asked Questions

Is ProWritingAid better than Grammarly for fiction?

Yes. ProWritingAid has fiction-specific reports (dialogue tags, pacing, sentence variety for narrative flow) and direct Scrivener integration. Grammarly doesn’t offer either. If you write novels, short stories, or screenplays, ProWritingAid is the clear choice for editing.

Can Grammarly do what ProWritingAid’s reports do?

Not really. Grammarly Premium offers clarity and style suggestions, but they’re individual corrections, not diagnostic reports. ProWritingAid’s 20+ reports analyze patterns across your entire document (sentence length variation, pacing, overused words, sticky sentences). Grammarly doesn’t provide that macro-level analysis.

Is the ProWritingAid lifetime deal worth it?

If you write regularly (3+ times per week), yes. At $399 one-time, it equals 3.3 years of annual billing ($120/yr). After that, it’s free forever. The only risk is if ProWritingAid shuts down or drastically changes their model, but they’ve been offering lifetime plans consistently for years. Grammarly has no equivalent option.

Which has better real-time checking?

Grammarly. Its real-time inline suggestions are faster, more accurate, and work across more platforms. ProWritingAid’s real-time checking works but can feel slightly slower, especially with longer documents. For always-on, background writing assistance, Grammarly’s real-time engine is more polished.

Final Verdict

Grammarly is the better everyday writing assistant: broader integrations, smoother real-time checking, and a more generous free plan. ProWritingAid is the better writing improvement tool: 20+ diagnostic reports, Scrivener integration, and a $399 lifetime deal. For casual writers who want protection across all apps, Grammarly. For serious writers who want to understand and fix their patterns, ProWritingAid. For the best of both worlds, use Grammarly daily and ProWritingAid for deep editing sessions.

Written by

Faz

Faz is the founder of AIToolsBakery. Every tool on this site is personally tested with real-world writing tasks before a single word gets published. No sponsored rankings, no recycled press releases.

Read more about how we test →

Faz

The Baker

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