Grammarly vs ProWritingAid

A side-by-side look at pricing, capabilities, pros, cons, and our editorial scores.

Tagline

Grammarly

Cross-app AI writing assistant that catches errors, rewrites paragraphs, and adjusts tone in the tools you already use.

ProWritingAid

AI-powered writing coach and manuscript editor built for fiction authors and long-form writers.

Pricing

Grammarly

Freemium· Free; Pro $12/mo annual or $30/mo; Enterprise custom

ProWritingAid

Freemium· Free: Free · Premium: €3000 · Premium Pro: €3600 · Lifetime Premium: €39900 · Lifetime Premium Pro: €69900

Lowest paid tier

Grammarly

—

ProWritingAid

€3000 · Premium

captured 2026-08-10

Free trial

Grammarly

Yes

ProWritingAid

Yes

Platforms

Grammarly

web

ProWritingAid

webdiscordchrome-extension

Company

Grammarly

Grammarly, Inc.

ProWritingAid

—

Model used

Grammarly

Proprietary + multi-model

ProWritingAid

Multi-model (proprietary + LLM-assisted features)

Best for

Grammarly

Pick Grammarly if you want a writing coach embedded in every app you already use and don't want to run your own LLM workflow.

ProWritingAid

Pick ProWritingAid if you're a novelist or long-form writer who wants craft-level feedback on pacing, dialogue, and structure beyond basic grammar.

Not for

Grammarly

Skip it if you need programmatic writing APIs, want full control of the model, or already pay for ChatGPT/Claude and prefer prompting directly.

ProWritingAid

Skip it if you mostly write short business emails or marketing copy, or if you need an API to embed writing checks into your own product.

Editorial score

Grammarly

7.9 / 10

ProWritingAid

8.0 / 10

Use cases

Grammarly

grammar-checktone-adjustmentparagraph-rewriteplagiarism-detectionresume-writingcitation-generation

ProWritingAid

fiction-editingmanuscript-analysisgrammar-and-styleai-rewritesbeta-reading

Pros

Grammarly

Runs inside almost every app and website with no copy-paste workflow
Free tier is genuinely usable for everyday proofreading
Enterprise-grade privacy controls and style guides for teams
Purpose-built agents (AI detector, humanizer, citations) beyond generic chat

ProWritingAid

Deep craft-level reports tailored to novelists, not just grammar fixes
Integrates with Word, Google Docs, Scrivener, and major browsers
Lifetime license option is rare in the writing-tool space
Explicit commitment to not training on your text

Cons

Grammarly

No public generative API for developer integrations
Pro is pricey vs. running rewrites through a raw LLM subscription
Suggestions can feel formulaic and flatten distinctive voice
Closed-source with limited transparency about underlying models

ProWritingAid

AI features are credit-limited on lower tiers
Report overload can be intimidating for new users
No public API for developers
Desktop app can be sluggish on very long manuscripts

Website

Grammarly

www.grammarly.com

ProWritingAid

prowritingaid.com

Editorial score: rule-based, 0–10, from AI-assisted profile inputs (see /methodology) — not a user rating; “—” means unscored. “Not listed” means we have no record of it, not that it is absent. GitHub figures and prices carry the date they were checked or captured; prices are shown as published, unconverted.

Pick Grammarly if

✅ Runs inside almost every app and website with no copy-paste workflow
✅ Free tier is genuinely usable for everyday proofreading
✅ Enterprise-grade privacy controls and style guides for teams
✅ Purpose-built agents (AI detector, humanizer, citations) beyond generic chat

Pick ProWritingAid if

✅ Deep craft-level reports tailored to novelists, not just grammar fixes
✅ Integrates with Word, Google Docs, Scrivener, and major browsers
✅ Lifetime license option is rare in the writing-tool space
✅ Explicit commitment to not training on your text

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