VS
Head-to-Head Comparison
Grammarly vs Perplexity AI
An honest, side-by-side breakdown of pricing, features, and security — so you can pick the right tool.
Feature comparison
| Feature | Grammarly | Perplexity AI |
|---|---|---|
| CompareMyAI score | 8.1 / 10 | 8.1 / 10 |
| Free tier | ||
| API access | ||
| Open source | ||
| Enterprise ready | ||
| GDPR compliant | ||
| SOC 2 certified | ||
| ISO 27001 | ||
| MFA supported | ||
| Trains on your data | Yes |
Pricing
G
FreeFree
Pro£10/mo
Enterprise—
FreeFree
Pro£17/mo
Always check the provider's site for the latest pricing. Prices marked are based on published data and are pending independent verification.
Pros & cons
Grammarly
Pros
- +SOC 2 Type II and ISO 27001 certified — strongest compliance in the writing category
- +Works across browser, desktop, Word, Google Docs, and email with one install
- +Pro tier confirmed at £10/mo in GBP — transparent UK pricing
- +Explicit opt-out from AI model training available in account settings
Cons
- −Trains on user writing by default — opt-out required
- −GDPR compliance not explicitly confirmed on accessed official pages
- −Free AI prompt limit (100/mo) may feel restrictive for daily users
Perplexity AI
Pros
- +Excellent real-time web search with cited sources
- +Great for research and fact-checking
- +Clean interface
- +Generous free tier
Cons
- −Less capable for long-form writing or coding
- −Not ideal for creative tasks
- −Pro plan required for advanced models
Our take— Grammarly wins
Based on our comparison of published pricing, features, and compliance data, Grammarly pulls ahead with ISO 27001 certification and multi-factor authentication. Perplexity AI counters with GDPR compliance. Grammarly scores 8.1/10 to Perplexity AI's 8.1/10. Pick Grammarly if ISO 27001 certification matters; pick Perplexity AI if GDPR compliance matters.