Prices in GBP. Verified monthly. Always check the provider's site for the latest.
Pros & cons
QuillBot
Pros
+Free tier paraphrases up to 125 words with no time limit
+9 paraphrase modes including Formal, Simple, Creative, and Expand
+Premium at £4/mo (annual) is the lowest price in the writing category
+Plagiarism checker and AI Detector bundled with Premium
Cons
−GDPR and SOC2 not confirmed from official sources
−Free tier capped at 125 words per paraphrase — limiting for longer content
−Focused on paraphrasing — not a full-document AI writing assistant
Devin
Pros
+Plans, writes, tests, and ships production code autonomously — confirmed from official product description
+UK GDPR and EEA data rights confirmed in Cognition privacy policy with UK IDTA in use
+Free tier available with selected features — no card required to start
+Integrates with existing codebases and tools including Devin Desktop (formerly Windsurf) IDE
Cons
−Trains on user code and content by default — confirmed from Cognition privacy policy
−SOC2 and ISO 27001 not confirmed from official sources
−Max plan (£157/month) is the highest per-user price in the agents category
Our take— Devin wins
Based on our comparison of published pricing, features, and compliance data, Devin scores 7.8/10 to QuillBot's 7.3/10. Devin pulls ahead with GDPR compliance and API access. QuillBot counters with a no-training-on-your-data policy. Pick Devin if GDPR compliance matters; pick QuillBot if a no-training-on-your-data policy matters.