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Antoine v.d. SwiftLee 

@twannl • 72,046 subscribers

I teach 150K developers how to write better apps faster through my developer tool, blog, and newsletter. Join my free course to get started 👇🏻

Shorts

The biggest lie in agentic development: "Run 4 agents on 4 projects at once." I built this animation to show why that fails. Focus on 1 project → 4/4 tasks done Context switch between 4 → 0/4 tasks done Same time. Different results.

The biggest lie in agentic development: "Run 4 agents on 4 projects at once." I built this animation to show why that fails. Focus on 1 project → 4/4 tasks done Context switch between 4 → 0/4 tasks done Same time. Different results.

159,716 views

Don't tell anyone: physical device support is coming to RocketSim - Build Apps Faster

Don't tell anyone: physical device support is coming to RocketSim - Build Apps Faster

23,565 views

Work in progress for RocketSim - Build Apps Faster: camera support for Xcode’s Simulator by using your Mac’s camera 🚀

Work in progress for RocketSim - Build Apps Faster: camera support for Xcode’s Simulator by using your Mac’s camera 🚀

28,059 views

📸 Detect barcodes like QR in Xcode's Simulator ✨ The next version of RocketSim - Build Apps Faster Camera Simulation supports capturing metadata like barcodes 🚀

📸 Detect barcodes like QR in Xcode's Simulator ✨ The next version of RocketSim - Build Apps Faster Camera Simulation supports capturing metadata like barcodes 🚀

17,037 views

Excited to share a preview of my upcoming course, 'From Side Project to Going Indie.' I'm revealing my best practices and valuable insights to help you transition successfully. Interested in early access? Reply to this tweet, and I'll send you a DM!

Excited to share a preview of my upcoming course, 'From Side Project to Going Indie.' I'm revealing my best practices and valuable insights to help you transition successfully. Interested in early access? Reply to this tweet, and I'll send you a DM!

18,201 views

Videos

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Stop killing your apps — you’re not saving battery, you’re draining it. 🪫

Stop killing your apps — you’re not saving battery, you’re draining it. 🪫

Antoine v.d. SwiftLee 

1,894,013 views • 5 months ago

Not one, but six new Agent Skills! Early adopters improved Xcode build times by 78%. After weeks of work, I launched my latest Agent Skill at Let’s Vision in Shanghai. Here’s how it works: It runs 3 clean + 3 incremental builds It analyzes build logs and project settings It proposes an optimization plan It applies improvements after you approve It re-benchmarks and reports the improvement All free → try it on your Xcode projects. Let me know how it goes in the replies, and open a PR if you add your results to the README!

Not one, but six new Agent Skills! Early adopters improved Xcode build times by 78%. After weeks of work, I launched my latest Agent Skill at Let’s Vision in Shanghai. Here’s how it works: It runs 3 clean + 3 incremental builds It analyzes build logs and project settings It proposes an optimization plan It applies improvements after you approve It re-benchmarks and reports the improvement All free → try it on your Xcode projects. Let me know how it goes in the replies, and open a PR if you add your results to the README!

Antoine v.d. SwiftLee 

125,044 views • 2 months ago

Stop letting your AI agent guess what’s inside the iOS Simulator. I built RocketSim’s CLI + Agent Skill so agents can inspect screens, tap, type, recover from state changes, and even validate accessibility support with far fewer tokens. Benchmarked against a popular alternative: 19% faster, 63% fewer estimated tokens, 0 wrong taps. Demo below 👇

Stop letting your AI agent guess what’s inside the iOS Simulator. I built RocketSim’s CLI + Agent Skill so agents can inspect screens, tap, type, recover from state changes, and even validate accessibility support with far fewer tokens. Benchmarked against a popular alternative: 19% faster, 63% fewer estimated tokens, 0 wrong taps. Demo below 👇

Antoine v.d. SwiftLee 

28,700 views • 24 days ago

Spent the week building an iOS Simulator CLI tuned for AI agents bundled in RocketSim - Build Apps Faster Head-to-head vs. popular open-source alternatives across 5 real Settings app flows: 📉 ~12x fewer tokens ⚡️ 1.6x faster ✅ 4x fewer wrong taps Token cost is the killer for any agent paying per call. What's the one Simulator flow you'd want this CLI to handle?

Spent the week building an iOS Simulator CLI tuned for AI agents bundled in RocketSim - Build Apps Faster Head-to-head vs. popular open-source alternatives across 5 real Settings app flows: 📉 ~12x fewer tokens ⚡️ 1.6x faster ✅ 4x fewer wrong taps Token cost is the killer for any agent paying per call. What's the one Simulator flow you'd want this CLI to handle?

Antoine v.d. SwiftLee 

29,723 views • 1 month ago

It turns out to be a special day today 🎉

It turns out to be a special day today 🎉

Antoine v.d. SwiftLee 

42,069 views • 5 months ago

Building this new Xcode Simulator recording editor took more effort than anticipated, but I'm finally pushing the TestFlight out this week. Do you want to try it out?

Building this new Xcode Simulator recording editor took more effort than anticipated, but I'm finally pushing the TestFlight out this week. Do you want to try it out?

Antoine v.d. SwiftLee 

16,900 views • 2 months ago

This free Mac app helps me solve crashes instantly. No more guessing, I'm only focused on writing a fix. Do you recognize those moments when you've received a crash report from a user? Or maybe you're debugging on a physical device from a colleague? I'm generally using Sentry for optimizing stability and fixing issues, but for the above cases, this is a great addition. Find the link below in the replies!

This free Mac app helps me solve crashes instantly. No more guessing, I'm only focused on writing a fix. Do you recognize those moments when you've received a crash report from a user? Or maybe you're debugging on a physical device from a colleague? I'm generally using Sentry for optimizing stability and fixing issues, but for the above cases, this is a great addition. Find the link below in the replies!

Antoine v.d. SwiftLee 

22,699 views • 7 months ago

The most requested feature by App Developers is finally here: Network Speed Control for Xcode’s Simulator! Test your apps like never before 🚀

The most requested feature by App Developers is finally here: Network Speed Control for Xcode’s Simulator! Test your apps like never before 🚀

Antoine v.d. SwiftLee 

31,913 views • 1 year ago

The 3 phases of refactoring a SwiftUI View to improve readability and reusability. 1️⃣ Extract Dedicated SwiftUI Views 2️⃣ Create Reusable View Modifiers 3️⃣ Build Generic View Extensions Applying these together makes your views easier to scan, read, and reuse. Your code becomes cleaner, faster, and future-proof. Scalability starts today. The fundamentals were built yesterday. (Short video below 🎥) #swiftdevelopment #iosdevelopment #swiftui #swiftlanguage

The 3 phases of refactoring a SwiftUI View to improve readability and reusability. 1️⃣ Extract Dedicated SwiftUI Views 2️⃣ Create Reusable View Modifiers 3️⃣ Build Generic View Extensions Applying these together makes your views easier to scan, read, and reuse. Your code becomes cleaner, faster, and future-proof. Scalability starts today. The fundamentals were built yesterday. (Short video below 🎥) #swiftdevelopment #iosdevelopment #swiftui #swiftlanguage

Antoine v.d. SwiftLee 

16,700 views • 7 months ago

🚀 BIG NEWS: I'm Going Indie & Launching My First Course! 🤩 After 7.5 amazing years WeTransfer, I'm leaving a truly special company and team. It's bittersweet, but going fully independent is a dream come true. Read my full story: 🌟 New Course: From Side Project to Going Indie 🌟 Are you ready to make your side project a success? Want to quit the 9-to-5 routine and endless meeting days to go independent? Perfect! This course is for you: #IndieDev

🚀 BIG NEWS: I'm Going Indie & Launching My First Course! 🤩 After 7.5 amazing years WeTransfer, I'm leaving a truly special company and team. It's bittersweet, but going fully independent is a dream come true. Read my full story: 🌟 New Course: From Side Project to Going Indie 🌟 Are you ready to make your side project a success? Want to quit the 9-to-5 routine and endless meeting days to go independent? Perfect! This course is for you: #IndieDev

Antoine v.d. SwiftLee 

35,637 views • 1 year ago

Simulator Camera support for RocketSim - Build Apps Faster is making progress! Apple's AVCam sample project now works out of the box 🚀

Simulator Camera support for RocketSim - Build Apps Faster is making progress! Apple's AVCam sample project now works out of the box 🚀

Antoine v.d. SwiftLee 

20,023 views • 1 year ago

Did you get an App Store rejection with the following reasoning? ITMS-91053: Missing API declaration Let me help you out:

Did you get an App Store rejection with the following reasoning? ITMS-91053: Missing API declaration Let me help you out:

Antoine v.d. SwiftLee 

25,163 views • 2 years ago

Unlock Your App's Potential: Design Tips for Non-Designers Listen to the full episode on or start your indie journey at #AppDesign

Unlock Your App's Potential: Design Tips for Non-Designers Listen to the full episode on or start your indie journey at #AppDesign

Antoine v.d. SwiftLee 

10,067 views • 1 year ago

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