Prices in GBP. Verified monthly. Always check the provider's site for the latest.
Pros & cons
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
Microsoft Copilot
Pros
+Built into Microsoft 365
+Strong enterprise security and compliance
+SOC2 and GDPR certified
+No separate subscription if you have M365
Cons
−Limited standalone value outside Microsoft ecosystem
−Less capable than ChatGPT or Claude for general tasks
−Requires M365 licence
Our take— Microsoft Copilot wins
Based on our comparison of published pricing, features, and compliance data, Microsoft Copilot pulls ahead with ISO 27001 certification and multi-factor authentication. Leonardo.ai counters with API access. Microsoft Copilot scores 7.8/10 to Leonardo.ai's 7.6/10. Pick Microsoft Copilot if ISO 27001 certification matters; pick Leonardo.ai if you need API access.