Bench test · AI Writing
Grammarly vs ProWritingAid
Grammarly beats ProWritingAid 9.0 to 7.7 on our four-agent test panel, winning 4 of 4 agents head to head. Grammarly: free tier; paid from $12/mo. ProWritingAid: free tier; paid from $120/mo. Facts last verified October 7, 2026.
| Grammarly | ProWritingAid | |
|---|---|---|
| consensus | score9.0/10 | score7.7/10 |
| agents won | 4 / 4 ▲ | 0 / 4 |
| from | $12/mo ▲ | $120/mo |
| free tier | yes | yes |
| category | AI Writing | AI Writing |
Agent panel — head to head
| Anthropic | 8.2 ▲ | 7.6 |
| OpenAI | 8.8 ▲ | 7.4 |
| Gemini | 9.4 ▲ | 8.4 |
| Grok | 9.5 ▲ | 7.2 |
Grammarly
- ✓Catches errors missed by other tools
- ✓Improves writing clarity and professionalism
- ✓Works across multiple platforms seamlessly
- —Premium features require paid subscription
- —Can be overly cautious with style suggestions
- —Occasional false positives in corrections
Grammar and spelling correctionTone detection and adjustmentClarity and readability suggestionsPlagiarism detectionAudience-specific writing guidanceBrowser and app integration
ProWritingAid
- ✓Detailed, actionable feedback beyond basic grammar
- ✓Versatile for multiple writing types and genres
- ✓Browser and desktop integrations available
- —Subscription model required for full features
- —Can be overwhelming for casual writers
- —Occasional over-flagging of stylistic choices
Grammar and spell checkingStyle and readability analysisStory structure and character development feedbackPlagiarism detectionReal-time suggestions and correctionsIntegration with word processors and browsers
$12/mo · free tier
Try Grammarly ▸$120/mo · free tier
Try ProWritingAid ▸Verdict
Grammarly takes it — 9 to 7.7.
The panel gave Grammarly the edge on 4 of 4 agents.