Prices in GBP. Verified monthly. Always check the provider's site for the latest.
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
Adobe Firefly
Pros
+Trained only on licensed and public domain content — safe for commercial use by design
+Free tier resets daily — usable at no cost with no credit card
+Integrates with Photoshop, Illustrator, and Adobe Express
+API access available for enterprise workflow integration
Cons
−GDPR and SOC2 compliance not confirmed on officially accessed pages
−Standard credits (2,000/mo) can deplete quickly with frequent video or high-res use
−Full feature depth requires a paid Adobe Creative Cloud subscription
Our take— Grammarly wins
Based on our comparison of published pricing, features, and compliance data, Grammarly pulls ahead with SOC 2 certification and ISO 27001 certification. Adobe Firefly counters with a no-training-on-your-data policy. Grammarly scores 8.1/10 to Adobe Firefly's 8.1/10. Pick Grammarly if SOC 2 certification matters; pick Adobe Firefly if a no-training-on-your-data policy matters.