VS
Head-to-Head Comparison
ChatGPT vs Grammarly
An honest, side-by-side breakdown of pricing, features, and security — so you can pick the right tool.
Feature comparison
| Feature | ChatGPT | Grammarly |
|---|---|---|
| CompareMyAI score | 8.7 / 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
FreeFree
Plus£17/mo
Team£25/mo
EnterpriseContact us
G
FreeFree
Pro£10/mo
EnterpriseContact us
Prices in GBP. Verified monthly. Always check the provider's site for the latest.
Pros & cons
ChatGPT
Pros
- +Largest plugin and integration ecosystem
- +Excellent at coding and analysis
- +GPT-4o handles images and voice
- +Widely supported across third-party tools
Cons
- −Trains on data by default — opt-out required
- −Pricing higher than some alternatives
- −Can be inconsistent on complex reasoning
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
Our take— ChatGPT wins
Based on our comparison of published pricing, features, and compliance data, ChatGPT scores 8.7/10 to Grammarly's 8.1/10. ChatGPT pulls ahead with GDPR compliance and a no-training-on-your-data policy. Grammarly counters with ISO 27001 certification. Pick ChatGPT if GDPR compliance matters; pick Grammarly if ISO 27001 certification matters.