I feel that Opus 5.5 + Artifacts have solved iOS app design and development too. Add an iPhone 12 mini + XCodeBuildMCP + Argent for verification on a real device, and they do a good job bringing it up to a production-ready level.
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Opus and Artifacts for iOS App Development
Opus 5.5 and Artifacts handle iOS design and development, while real-device verification helps bring the result to production readiness.