A weekly Swift & Agentic Development blog

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  RocketSim

  Mac app

  The iOS Simulator companion for developers and AI coding agents.

  • Inspect, test, and debug your app without leaving the flow
  • CLI and Agent Skill so Cursor, Claude, and Codex can see and control the Simulator

  25,000+ developers, 250+ teams

  Get RocketSim
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  RocketTrace

  Mac app

  Find what slows your app down, straight from Instruments traces.

  • Ranked, measured findings from your Instruments traces
  • Agent-ready prompts, benchmarked at up to 5.6x fewer tokens

  1,218 traces analyzed

  Try RocketTrace
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  Swift Concurrency

  Course

  Go from confusion to confidence in Swift Concurrency.

  • 13 modules, 73+ lessons, updated for Swift 6.4
  • Quizzes, code examples, and an official certificate

  Used by developers at Airbnb, Garmin, and Monzo

  View the courseOr start with the free 5-day Playbook
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  AI Fundamentals

  Course

  Agentic coding fundamentals that outlast every new tool and model.

  • A tool-agnostic system for Claude Code, Codex, and Cursor
  • Built on 1,674 of my own agent sessions

  Launch price until December 22

  View the courseOr get the free token cleanup prompt

• Swift165 articles

  • Sendable and @Sendable closures explained with code examples
  • @MainActor in Swift explained with code examples
  • Defer in Swift explained with Code Examples

• Combine9 articles

  • Combine and Swift Concurrency: A threading risk
  • @Published risks and usage explained with code examples
  • RunLoop.main vs DispatchQueue.main: The differences explained

• Concurrency37 articles

  • Sendable and @Sendable closures explained with code examples
  • @MainActor in Swift explained with code examples
  • Swift 6.4: What’s New in Concurrency

• SwiftUI55 articles

  • SwiftUI Performance: Find Redraws in Xcode Instruments
  • iPhone Duo Simulator: Testing and optimizing your SwiftUI app
  • SwiftUI Agent Skill: Install and use with AI coding tools

• Core Data15 articles

  • Core Data Agent Skill: Now available open-source
  • How to observe NSManagedObject changes in Core Data using Combine
  • Data validation on insertion, update, and deletion in Core Data

• Xcode52 articles

  • How the Xcode 27 MCP can lead to higher token costs when navigating the Simulator
  • SwiftUI Performance: Find Redraws in Xcode Instruments
  • How to free up Xcode disk space safely with an AI Agent

• Debugging17 articles

  • User Diagnostics Reports: Solving app bugs faster with AI Agents
  • VoiceOver Navigator & 120 FPS Recordings for Xcode’s Simulator
  • Network Link Conditioner: Simulating Slow Networking

• Workflow26 articles

  • RocketSim 15: VoiceOver Navigator & Pro Simulator Recordings
  • Icon Composer: Transforming an AI-generated icon
  • From App Idea to 10K MRR – YouTube Series

• Optimization43 articles

  • User Diagnostics Reports: Solving app bugs faster with AI Agents
  • Unexpected Task suspension points in Swift Concurrency
  • The “One More Prompt” risk of agentic coding

• Swift Charts1 article

  • Bar Chart creation using Swift Charts

• Swift Testing7 articles

  • Swift Testing explained with code examples
  • Swift Testing Agent Skill: Write high quality tests with AI
  • Parameterized tests in Swift: Reducing boilerplate code

• AI Development25 articles

  • Agentic engineering: why I built the AI Fundamentals course
  • Agent hooks in Claude Code, Cursor, and Codex explained
  • How the Xcode 27 MCP can lead to higher token costs when navigating the Simulator

• Claude Code iOS Simulator Setup with RocketSimSet up Claude Code, Codex, or Cursor to run and verify your iOS app in the Simulator with RocketSim's CLI and Agent Skill. Follow the step-by-step guide.Nov 5, 2026
• XcodeBuildMCP and Xcode MCP with RocketSimUse XcodeBuildMCP or Xcode's MCP bridge to build and run your app, then let RocketSim verify it in the iOS Simulator. See how the three fit together.Nov 3, 2026
• iOS Simulator MCP vs CLI for AI AgentsCompare an iOS Simulator MCP server with RocketSim's CLI and Agent Skill, see the July 2026 benchmark, and set up your AI agent in Xcode, Cursor, or Codex.Oct 29, 2026

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  Video Compressor

  iPhone app

  Same video, less space. Recover iPhone storage privately.

  • Compare the real result side by side before you decide
  • Private and on device: your videos are never uploaded
  Get Video Compressor
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  MCP Beast

  Mac app

  One private gateway for all your MCP servers.

  • 95%+ fewer tool tokens, measured on a real iOS stack
  • Works with Cursor, Claude, Codex, and more
  Get MCP Beast
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  Going Indie

  Course

  From side project to a successful independent business.

  • Goals, focus, and productivity habits for indie developers
  • Marketing, audience growth, and monetization with real case studies
  View the course