Best Grammar Checkers · head-to-head
ProWritingAid vs Grammarly
A sourced, side-by-side comparison for grammar checkers. ProWritingAid has the lower entry price. Every figure links to the vendor's own page and the date we captured it.
At a glance
- Price: ProWritingAid $0/mo vs Grammarly $0/mo — ProWritingAid is cheaper to start.
- Free tier: ProWritingAid Yes; Grammarly Yes.
- HIPAA: ProWritingAid No; Grammarly No.
Side by side
| ProWritingAid | Grammarly | |
|---|---|---|
| Entry price | $0/mo (Free) | $0/mo (Free) |
| Free tier | Yes | Yes |
| HIPAA (BAA) | No | No |
| SOC 2 | Yes | Yes |
| GDPR | Yes | Yes |
| Best for | fiction authors | enterprise teams |
Sources — ProWritingAid: prowritingaid.com (verified 2026-06-15). Grammarly: grammarly.com (verified 2026-06-15).
Key features
ProWritingAid: SOC 2 Security compliance assessed by third-party auditors (per trust-center); CREST-approved penetration testing; 25+ writing analysis reports covering readability, structure, pacing, and style; Fiction-specific tools: Virtual Beta Reader, Chapter Critique, Story Canvas, author comparison across 90 writers; Never uses submitted text to train algorithms; lifetime (one-time purchase) plan available
Grammarly: SOC 2 Type 2 + SOC 3 reports; ISO 27001/27017/27018/27701/42001 certified (per grammarly.com/security); GDPR and CCPA compliant (explicit statement on grammarly.com/business); Enterprise SAML SSO and SCIM provisioning for identity management; Works across many apps via browser extension and native integrations