Prices in GBP. Verified monthly. Always check the provider's site for the latest.
Pros & cons
Sudowrite
Pros
+Explicit commitment to never training on user manuscripts — confirmed on pricing page
+Specialised fiction tools: character generation, outline, scene expansion
+Claims no rights over user content or generated output
+30+ language support across all plans
Cons
−No free tier — paid plans only
−GDPR and SOC2 not confirmed from official sources
−Fiction-only focus — not suited for marketing copy, email, or business writing
Leonardo.ai
Pros
+GDPR compliant — UK GDPR and EU GDPR explicitly listed in ToS
+Free tier confirmed in ToS — usable without payment
+API available with separate billing for developer integration
+Wide range of fine-tuned models for games, concept art, and illustration
Cons
−Pricing not verified — official site inaccessible to automated tools; check leonardo.ai for current plans
−Free user content used to train AI models — paid private content exempt
−SOC2 and ISO 27001 not confirmed from official sources
Our take— Leonardo.ai wins
Based on our comparison of published pricing, features, and compliance data, Leonardo.ai scores 7.6/10 to Sudowrite's 7.1/10. Leonardo.ai pulls ahead with GDPR compliance and SOC 2 certification. Sudowrite counters with a no-training-on-your-data policy. Pick Leonardo.ai if GDPR compliance matters; pick Sudowrite if a no-training-on-your-data policy matters.