Prices in GBP. Verified monthly. Always check the provider's site for the latest.
Pros & cons
HeyGen
Pros
+SOC 2 Type II certified with a dedicated Data Protection Officer
+175 languages with AI lip-sync — broadest language support in category
+Free tier includes 3 videos and a custom digital twin
+API access from Creator tier for workflow automation
Cons
−Uses user content to train models by default — opt-out required
−Credit costs for Avatar IV/V are 20× higher than Avatar III
−Business tier at £117/mo is expensive for smaller teams
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— Grammarly wins
Based on our comparison of published pricing, features, and compliance data, Grammarly pulls ahead with ISO 27001 certification. HeyGen counters with GDPR compliance. Grammarly scores 8.1/10 to HeyGen's 8.0/10. Pick Grammarly if ISO 27001 certification matters; pick HeyGen if GDPR compliance matters.