Developer tracks ROI on $100 Claude AI subscription building solo mobile app in 70 hours

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A software engineer with eight years of backend experience documented the real-world return on his $100 Claude Code subscription by building a full-stack multiplayer mobile app called Kombat entirely as a solo side project. The app includes 17 screens, five games, a non-custodial crypto wallet, WebSocket multiplayer logic, a backend REST server, and a web app with an admin panel. The developer had zero prior React Native experience before starting on July 1, 2026, and completed approximately 70 hours of work across 34 coding sessions, mostly after regular work hours. Rather than relying on anecdotal claims of AI making developers '10x' more productive, the author used git logs to quantify actual time spent and assess the subscription's value. Kombat is currently in closed iOS testing at playkombat.xyz, with an Android version planned for release later.

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