Grammarly vs ProWritingAid: Which Grammar Checker Is Worth Paying For?

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Grammarly vs ProWritingAid — which grammar checker is worth paying for in 2026? Both are legitimate tools used by professional writers. The honest answer: Grammarly wins for most freelancers. ProWritingAid wins for serious novelists and long-form editors. Here’s why.

Quick Comparison

What Is Grammarly?

Grammarly is an AI-powered writing assistant that checks grammar, spelling, clarity, tone, and style in real time. The browser extension works inside Gmail, Google Docs, LinkedIn, Slack, your CMS, and virtually any text input on the web. The Premium plan adds full AI rewrites, tone detection, advanced vocabulary suggestions, and plagiarism checking.

Grammarly is optimized for professional and business writing: emails, proposals, blog posts, reports, social content, and any client-facing communication.

What Is ProWritingAid?

ProWritingAid is a comprehensive editing suite that goes deeper than Grammarly on structural and stylistic analysis. Its 25+ in-depth reports analyze everything from sentence length variation to dialogue pacing to repetitive word use to readability across different age groups. It’s built for writers who want to understand why their writing has issues, not just fix them.

ProWritingAid integrates with Scrivener, Google Docs, Microsoft Word, and a browser extension — though the extension is less polished than Grammarly’s.

Feature-by-Feature Comparison

1. Grammar and Spelling Accuracy

Both are excellent; Grammarly edges ahead. Grammarly catches more edge cases in formal and professional writing — complex comma rules, advanced grammar issues, and nuanced style choices. ProWritingAid is equally accurate on the fundamentals but occasionally misses informal writing conventions.

For professional freelancers, the difference is minor. Both are dramatically better than relying on MS Word’s spellcheck.

2. AI Writing Assistance

Grammarly wins significantly. Grammarly’s Premium plan includes full AI-powered sentence rewrites, tone adjustment, and suggestion explanations. You can accept a rewrite with one click or ask it to try again with a different approach.

ProWritingAid’s AI features are more limited — it suggests improvements but doesn’t rewrite sentences with the same fluency as Grammarly’s AI layer.

3. Style and Depth of Feedback

ProWritingAid wins decisively. This is where ProWritingAid earns its reputation. Its 25+ reports cover: overused words, sentence length variety, dialogue pacing, passive voice patterns, readability scores, genre-specific style comparisons, writing style fingerprinting, and more.

For a freelancer writing a business email, this depth is overkill. For a novelist or long-form content creator who wants to systematically improve their craft, it’s invaluable.

4. Real-Time Editing (Browser Extension)

Grammarly wins by a wide margin. Grammarly’s browser extension is one of the most polished browser tools available. It works seamlessly inside Gmail, LinkedIn, Google Docs, WordPress, Notion, Slack, and hundreds of other platforms. The suggestions appear inline as you type.

ProWritingAid’s browser extension works but is noticeably less reliable. It struggles with some platforms and occasionally interferes with the typing experience. For freelancers who write across multiple platforms throughout the day, this is a significant practical disadvantage.

5. Integration with Writing Apps

ProWritingAid wins for dedicated writing apps. The Scrivener integration is ProWritingAid’s killer feature for serious writers — you can run deep analysis reports without leaving your writing environment.

Grammarly integrates well with Google Docs and Microsoft Word, which covers most freelancers’ needs.

6. Plagiarism Detection

Grammarly Premium includes it; ProWritingAid charges extra. Grammarly Premium’s plagiarism checker scans against billions of web pages. ProWritingAid charges extra for plagiarism checks ($10 for 50 checks). For freelancers who occasionally need to verify AI-assisted content, Grammarly’s inclusion is a meaningful advantage.

7. Pricing

ProWritingAid is slightly cheaper.

• Grammarly Premium: ~$12/month (annual billing), ~$30/month (monthly)
• ProWritingAid Premium: ~$10/month (annual), ~$24/month (monthly); Lifetime option ~$399

ProWritingAid’s lifetime option is genuinely compelling for serious writers who plan to use it long-term.

Who Should Choose Grammarly?

Choose Grammarly if you:

• Write primarily for business: emails, proposals, reports, blog posts, social content
• Work across multiple platforms and want seamless browser integration
• Want AI-powered sentence rewrites, not just corrections
• Value the real-time, everywhere experience over deep analysis reports
• Are a generalist freelancer (copywriter, consultant, marketer)

Try Grammarly Premium free →

Who Should Choose ProWritingAid?

Choose ProWritingAid if you:

• Write fiction or long-form narrative content
• Want deep structural analysis of your writing style (not just corrections)
• Use Scrivener as your primary writing environment
• Want to understand why your writing has issues, not just fix the symptoms
• Write primarily in a desktop app rather than across web platforms

Can You Use Both?

Yes, and some serious writers do. Use Grammarly for day-to-day writing across all platforms, and ProWritingAid for deep editing sessions on long-form work. Both have free tiers, so you can test this workflow without paying for either initially.

Verdict for Freelancers

For most freelancers: Grammarly Premium is the better choice. The browser extension that works everywhere, the AI rewrites, and the tone detection make it the more practical tool for the varied writing demands of freelance work.

The $12/month pays for itself the first time it catches an embarrassing error in a client email. And the AI rewrite feature alone can replace what used to require 20 minutes of manual editing.

For the full AI writing toolkit beyond grammar checking, see our AI writing tools comparison and our roundup of best AI tools for freelancers.