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

  930 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

  Coming soon

  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

  Waitlist open

  Join the waitlistOr 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

• Xcode51 articles

  • SwiftUI Performance: Find Redraws in Xcode Instruments
  • How to free up Xcode disk space safely with an AI Agent
  • How to Test iOS Apps in Different Time Zones on a Physical iPhone

• 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 Development22 articles

  • Agentic iOS Development with RocketSim and RocketTrace
  • Introducing RocketTrace: Using Xcode Instruments with AI Agents
  • How to reduce token usage in Claude Code, Codex, and Cursor

• Accessibility Audit on the iOS SimulatorRun an accessibility audit on the iOS Simulator: get a score, copy a fix prompt for your AI agent, or automate audits and validation with the rocketsim CLI.Oct 12, 2026
• Xcode Device Hub and the Future of RocketSimXcode Device Hub replaces the Simulator window in Xcode 27. Here is how to fix it when it won't launch, and why RocketSim is here to stay.Sep 22, 2026
• Device Hub: Restore Missing Simulator FeaturesRestore missing Xcode Device Hub Simulator features like Shake, Slow Animations, shortcuts, appearance switching, and drag-and-drop imports.Sep 22, 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