Grammarly
AI writing assistant that checks grammar, tone, and clarity and generates text across apps and browsers
Style-and-grammar writing assistant with 25+ in-depth reports, built for novelists and long-form writers editing full manuscripts
ProWritingAid is a writing assistant built around deep grammar and style reports, now heavily geared toward novelists. The free tier caps checks at 500 words; Premium costs $30/month or $120/year, Premium Pro adds AI coaching at $36/month or $144/year, and one-time Lifetime licenses run $399 or $699. Best for long-form and fiction writers who value 25+ analysis reports over a fast inline checker.
ProWritingAid is a writing-improvement tool that pairs a grammar and spelling checker with more than 25 in-depth style reports — covering pacing, sentence length, overused words, echoes, sensory detail, and readability grade. Where a typical grammar checker fixes surface errors, ProWritingAid is designed to surface structural and stylistic patterns across a whole document. Over recent releases it has repositioned around fiction, describing itself as a toolkit for storytellers and adding Chapter Critique, Manuscript Analysis, and Plot, Character, and Marketability reports aimed squarely at novelists. The free tier is capped at 500 words per check with 2 report runs per day, so serious use effectively requires a paid plan.
Beyond reports, the tool includes Rephrase and rephrase-expansion controls to rewrite or lengthen selected sentences, and Sparks AI prompts to break through writer’s block, with daily limits that scale by tier. It runs as Mac and Windows desktop apps and integrates directly with Microsoft Word, Google Docs, Scrivener, and Apple Pages, plus Chrome, Firefox, and Edge browser extensions. Pricing is unusual for the category: alongside Premium ($30/month or $120/year) and Premium Pro ($36/month or $144/year), ProWritingAid sells one-time Lifetime licenses at $399 (Premium) and $699 (Premium Pro). The company states it never trains its algorithms on user writing.
ProWritingAid is best suited to writers working on long documents — novels, theses, reports, and book-length manuscripts — who want deeper feedback than a real-time grammar checker provides and are willing to spend time interpreting detailed reports. It is a weaker fit for users who mainly want fast inline corrections while typing emails or browsing, where a lighter tool feels quicker.
Starting price: $30/mo · Free tier: yes · Model: freemium
Price history tracked from June 2026
| Plan | Price | Includes |
|---|---|---|
| Free | Free | 500-word check limit · 2 runs per report per day · 10 Rephrases and 3 Sparks per day · Basic grammar, spelling, and punctuation · Word Explorer and thesaurus |
| Premium | $30/mo | $120/year billed annually (~$10/mo) · Unlimited word count and report runs · 25+ writing analysis reports · Unlimited Rephrases; 5 Sparks per day · 1 Chapter Critique per day · Custom style guide, snippets, and unlimited storage |
| Premium Pro | $36/mo | $144/year billed annually · Everything in Premium · 50 Sparks per day · 3 Chapter Critiques per day · Live workshops and 200+ on-demand expert sessions · Up to 65% off Story Credits |
| Lifetime Premium | $399 | One-time payment, no recurring fee · All Premium features permanently · 3-day money-back guarantee |
| Lifetime Premium Pro | $699 | One-time payment, no recurring fee · All Premium Pro features permanently · 3-day money-back guarantee |
| Pros | Cons |
|---|---|
| 25+ in-depth reports go far deeper than a basic grammar checker — pacing, sensory, echoes, and readability analyses are unusual in this category | Slower and heavier than Grammarly on long documents — running the full report suite on a book-length file takes noticeable time |
| Purpose-built for long-form fiction: Chapter Critique plus Manuscript and Marketability Analysis target novelists specifically | The volume of reports and highlights can overwhelm; interpreting 25+ analyses carries a real learning curve for new users |
| One-time Lifetime licenses ($399 Premium, $699 Pro) avoid recurring subscriptions, which is rare among writing tools | Real-time inline and browser checking is weaker and less polished than Grammarly's live experience |
| Wide integration coverage across desktop apps, MS Word, Scrivener, Google Docs, and the major browsers | The free tier is restrictive — a 500-word cap and only 2 report runs per day make it closer to a demo than a usable free plan |
| Pledges never to train its algorithms on user writing | 2026 pricing rose sharply (annual Premium went from $79 to $120), so it is no longer clearly cheaper than rivals |
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Yes, there is a permanent free tier. It caps checks at 500 words and 2 runs per report per day, with 10 Rephrases and 3 Sparks daily, plus basic grammar, spelling, and punctuation. Unlimited word count and the full 25+ reports require Premium.
Premium is $30/month or $120/year (about $10/month annually). Premium Pro is $36/month or $144/year. One-time Lifetime licenses are $399 for Premium and $699 for Premium Pro. Pricing was verified July 2026 on the official pricing page.
Yes. Lifetime Premium is a one-time $399 and Lifetime Premium Pro is a one-time $699. Both remove recurring payments and include a 3-day money-back guarantee.
Both include unlimited word count and the 25+ reports. Premium Pro ($36/month or $144/year) adds more AI Sparks (50 per day versus 5), 3 Chapter Critiques per day, live workshops, 200+ on-demand sessions, and larger Story Credit discounts.
ProWritingAid offers deeper style and manuscript reports aimed at long-form and fiction writers, while Grammarly has a faster, more polished real-time inline experience. See /tools/grammarly for a full comparison.
It offers Mac and Windows desktop apps and integrates with Microsoft Word, Google Docs, Scrivener, and Apple Pages, plus browser extensions for Chrome, Firefox, and Edge.
The company states it uses bank-level security and pledges never to train its algorithms on user content. For a lighter paraphrasing-focused alternative, see /tools/quillbot.