AI Tool Comparison
Grammarly vs ProWritingAid
A side-by-side breakdown to help you pick the right tool for your workflow.
Grammarly
Catch grammar and clarity issues as you write, then let built-in AI agents draft, rewrite, and complete tasks across your apps. Grammarly's parent company rebranded to Superhuman in October 2025.
ProWritingAid
Run a manuscript through 25+ style and grammar reports and get a full chapter critique daily, with a one-time lifetime purchase option instead of a subscription.
Bottom Line
Last reviewed: August 2026
Grammarly and ProWritingAid both compete in Writing, overlapping most directly on writing. Grammarly carries the higher rating (4.7 vs 4.5), but a gap that size rarely overrides a real workflow fit on its own.
Choose Grammarly if…
Best for catching grammar and clarity issues in real time as you write anywhere online, and its edge is built-in AI agents now draft and rewrite across your apps, not just proofread. The baseline writing check most people should already have running.
Choose ProWritingAid if…
Best for long-form writers who want a detailed report on style and structure, not just real-time error flags, and its edge is reports on overused words, pacing, and sentence variation across an entire finished draft. The most thorough writing analysis available, the depth of the reports can overwhelm short-form marketing work.
| Attribute | Grammarly | ProWritingAid |
|---|---|---|
| Category | Writing | Writing |
| Pricing | freemium | freemium |
| Pricing Detail | Free / $12/mo Pro (annual) / Enterprise custom | Free / $30/mo Premium / $36/mo Premium Pro / $399 lifetime |
| Rating |
Key Features
Grammarly
- Grammar and spelling checks
- Tone detection
- Plagiarism checker
- Generative AI co-creator
- Browser extension
ProWritingAid
- 25+ writing reports
- Style guide
- Readability analysis
- Word explorer
- Integration with Scrivener/Word/Google Docs
Pros
Grammarly
- •Works everywhere you write
- •Highly accurate suggestions
- •Improves overall writing quality
- •Generative features are helpful
ProWritingAid
- •Most thorough writing analysis available
- •Excellent for learning writing style
- •Works in your favorite writing app
- •Great for long-form writers
Cons
Grammarly
- Premium plan is somewhat pricey
- Can be overly pedantic
- Generative features are basic compared to ChatGPT
ProWritingAid
- Reports can be overwhelming
- Less useful for short-form marketing copy
- Interface is dated