212: “The ghost that keeps haunting us”
53 min
John and Rambo share their initial impressions of developing apps for iPhone Duo.
About the show
A podcast about life and technology from two developers’ perspectives. With John Sundell and Gui Rambo.
Newest episodes
211: “It’s not analytics, it’s telemetry”
51 min
John and Rambo discuss various ways of implementing logging, telemetry, and analytics within a project, and how to decide when and how to bring in a third party dependency.
210: ”Just bytes in a pipe”
1 hr 12 min
John and Rambo revisit the topic of closures and how their use has evolved since Objective-C’s blocks, and then go on a behind-the-scenes deep dive into AirBuddy 3.
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The newest 50 of 135 episodes
212: “The ghost that keeps haunting us”
53 min
John and Rambo share their initial impressions of developing apps for iPhone Duo.
211: “It’s not analytics, it’s telemetry”
51 min
John and Rambo discuss various ways of implementing logging, telemetry, and analytics within a project, and how to decide when and how to bring in a third party dependency.
210: ”Just bytes in a pipe”
1 hr 12 min
John and Rambo revisit the topic of closures and how their use has evolved since Objective-C’s blocks, and then go on a behind-the-scenes deep dive into AirBuddy 3.
209: “False positives or positive negatives”
48 min
John and Rambo discuss the pros and cons of using AI assistants and agents in the context of open source, as well as how unit testing has evolved on Apple’s platforms during the last few years, with the introduction of tools such as Swift Testing.
208: “You are the compiler”
1 hr 7 min
John and Rambo discuss some of the new APIs and technologies introduced at WWDC26, including new Swift features, and changes to frameworks like AppKit and FoundationModels. Also, the state of Swift 6, and WWDC video watching strategies.
207: “It’s not magic, it’s all in the kernel”
1 hr 10 min
John builds a cross-platform UI framework in Rust, and Rambo uses the macOS virtualization system to create a virtual iPhone.
206: “Let’s deprecate Xcode projects”
53 min
Using Android as an iOS user, and the state of Swift Package Manager, including how it could become a more full-featured orchestration tool for Xcode projects.
205: “The 2026 edition”
1 hr 6 min
On this first episode of the 2026 season, John and Rambo discuss how they’re using AI agents when working on different projects, and how to approach learning new programming languages in 2026.
204: “Ship a prompt”
1 hr 3 min
Stacktrace is back! John and Rambo check their hype levels for WWDC24, and discuss how AI might fit into Apple’s plans for this year’s releases. Also, Xcode wishes, and the challenges of building distributed systems.
203: “The Sherlock Holmes of debugging”
1 hr 15 min
John and Rambo reflect on what they’ve been learning and how they’ve been aiming to improve as developers during 2023. Also, tips for getting better at debugging, deploying generative AI within existing apps, and are view models really such a good fit for SwiftUI views?
202: “Incrementing the integer”
1 hr 4 min
Reactions to Apple’s “Scary fast” event, Rambo’s review of the iPhone 15 Pro Max, and under the hood of CleanupBuddy.
201: “USB-C utopia”
1 hr 6 min
Will this year’s iPhones switch to USB-C instead of Lightning, what could an Apple Watch Ultra-style action button be used for on a phone, and will Apple give us another look at the Vision Pro at their upcoming “Wanderlust” event?
200: “Expectation recalibration”
1 hr 10 min
Rambo’s custom implementation of macOS desktop widgets and how they relate to Apple’s new built-in system feature, why the experience of using SwiftUI depends so much on the environment it’s being used in, and a mini-review of the ASUS ROG Ally.
199: “Taking the cover off the API”
1 hr 18 min
John and Rambo start diving into the new announcements from WWDC23 — including the Apple Vision Pro and visionOS, the new Apple Silicon-powered Mac Pro, as well as many of the updates to Apple’s various operating systems.
198: “WWDC23 Keynote Poker”
1 hr 23 min
With the start of WWDC23 just around the corner, John and Rambo share their predictions, hopes, and dreams as to what Apple might introduce during this year’s edition of the conference. It’s Keynote Poker time!
197: “Perceived fluidity”
39 min
Reducing UI flickering, designing in-app purchase and signup flows, and how adding delays can interestingly make a UI feel more smooth and stable.
196: “That new Mac smell”
1 hr 16 min
Integrating AI-powered features into an iOS app, using high refresh rate monitors with a Mac, the advantages of simple abstractions, and how the M1 and M2 Max compare in terms of Xcode work.
195: “The Swift historian”
1 hr 24 min
John and Rambo celebrate the 5-year anniversary of the show by looking back at how their work and the technology they use have changed since the beginning of the show. Also, how might things change during the next 5 years, specifically when it comes to machine learning, AR, and the openness of Apple’s platforms?
194: “Definitely not called a puppy”
1 hr 18 min
How game controllers communicate with a Mac, handling asynchronous data and actions in SwiftUI, and various ways to use view models within a code base.
193: “Build your own Mac”
1 hr 14 min
Thoughts on the most recent Mac Pro rumors, building custom layouts for SwiftUI views in a backward-compatible manner, and the mechanics of making a UI interaction feel responsive and fluid.
192: “Sundell Silicon”
1 hr 21 min
Building computers, running A/B tests as an indie developer, using UIKit as a layout tool for SwiftUI views, and deciding whether to use Core Data or a more simple on-disk data storage solution.
191: “Back to the future”
53 min
Building custom collection view layouts, introducing new features into a legacy code base, and managing patch releases while also working on a major new version of an app at the same time.
190: “Actual trips to the Dynamic Island“
1 hr 9 min
John’s got the new AirPods Pro, Rambo’s got the iPhone 14 Pro, so the two share their initial impressions of using these new devices and how features like Dynamic Island and Adaptive Transparency work in day-to-day use.
189: “The UI equivalent of a singleton”
1 hr 0 min
John and Rambo discuss three of the key announcements that Apple made during their “Far Out” event — the Apple Watch Ultra, the new AirPods Pro, and the iPhone 14 Pro.
188: “The least risky of the risky ones”
42 min
With Apple’s upcoming “Far Out” event just around the corner, John and Rambo share their predictions as to what new devices, services and features that might be announced. It’s Apple Keynote Poker time!
187: “An endless supply of SwiftUI thoughts”
1 hr 2 min
John gains a new “job title”, Rambo starts working on an iOS version of AirBuddy, and the two discuss how come the Apple developer community tends to be so focused on UI frameworks.
186: “A relational database using Markdown”
1 hr 29 min
John and Rambo share their initial impressions of some of the new APIs that were announced at WWDC22, and talk about managing releases, learning when and how to apply generics, and the launch of the Gigahertz podcast network.
185: “A big ‘finally’ moment”, the WWDC22 keynote review
1 hr 37 min
John and Rambo discuss Apple’s WWDC22 keynote, and share their first impressions of the new features and APIs that were announced.
184: “State of anticipation”
1 hr 29 min
It’s time for John and Rambo to play another round of Apple Keynote Poker! This time the two place their bets as to what Apple might introduce during the WWDC22 keynote and State of the Union session.
183: “Let’s just call it MVC”
1 hr 15 min
Organizing workspaces and hobby projects, the pros and cons of view models and controllers, and rendering Core Animation layers within SwiftUI view hierarchies.
182: “Are you ready to enter a rabbit hole?”
1 hr 7 min
A deep dive into how WidgetKit and SwiftUI’s serialization mechanism works under the hood, why John removed the ads from the Swift by Sundell website, and the discontinuation of the last iPod model.
181: “The banner effect”
52 min
Balancing refactoring with feature development, abstracting system services, and building delightful UIs.
180: “Production software is a lot of work”
59 min
Custom macOS virtualization on Apple Silicon, the pros and cons of SwiftUI’s List view, initial thoughts on WWDC 2022, and why Italy is such an amazing place.
179: “An iMac without the Mac”
1 hr 18 min
New website, new logo, same show! Rambo shares his initial impressions of using Apple’s new Studio Display, along with some interesting spelunking results. Also, behind the scenes of the show’s new website, and a few web development tips.
178: “Let’s try something new”
1 hr 3 min
John and Rambo celebrate the show’s 4th birthday with a big announcement, and then talk about security research, project priorities, and how to combine SwiftUI views with protocol-based observable objects.
177: “The stand is included!”
1 hr 9 min
John and Rambo share their first impressions of the products announced at Apple’s “Peek Performance” event — including the new iPhone SE and iPad Air, M1 Ultra, Mac Studio and the Studio Display.
176: “Extra Keynote Poker”
1 hr 19 min
On this extra episode of the show, John and Rambo share their bets, hopes and predictions for Apple’s upcoming “Peek Performance” event.
175: “A Bluetooth fanboy”
54 min
Unit testing SwiftUI-based views, view and data architecture, as well as a behind the scenes look at Rambo’s home automation setup.
174: “An operating system toolkit”
54 min
John and Rambo speculate what the SDK for Apple’s rumored AR/VR devices might look like, and what sort of user experiences that we might be able to build using it.
173: “The fabric of space-time”
1 hr 14 min
SwiftUI for animations, prototyping, and game development. Plus, a second review of the M1 Max-based MacBook Pro, and an update on how well it performs for gaming.
172: “The ‘weak self’ dance”
1 hr 3 min
How memory management works when using Swift’s new concurrency features, getting out of productivity traps, remote pair programming, and the process of installing Mac apps.
171: “Three levels of happiness”
1 hr 25 min
Continued discussions around using SwiftUI for custom animations and layouts, more on phased rollouts and prioritizing bug fixes, content exclusivity and acquisitions, and various ways of sharing code across Apple’s platforms.
170: “Welcome to programming”
1 hr 0 min
John and Rambo revisit the topic of SwiftUI and UIKit interoperability, and discuss which of the two UI frameworks that’s recommend for beginners to start with. Also, the launch of AirBuddy 2.5, and using phased rollouts when releasing new app versions.
169: “Choosing what bugs to ship”
59 min
Stacktrace is back! On this first episode of 2022, John and Rambo talk about their holidays, using Swift Playgrounds to build apps on the iPad, Mac gaming, and project goals.
168: “The 2021/2022 New Year’s Eve Special”
1 hr 26 min
Join John and Rambo on this special New Year’s Eve episode of Stacktrace, on which they celebrate some of their favorite moments, products, media, and learnings from 2021.
167: “iPad is now Turing Complete”
1 hr 1 min
John and Rambo share their first impressions of the newly released Swift Playgrounds 4, which enables developers to build full iOS apps right on the iPad. Also, the value of narrowly scoped open source libraries, and what it’s like using GitHub CoPilot in practice.
166: “A little bit of compiler magic”
51 min
The importance of sleep for both humans and async tasks, transferring apps and Apple developer accounts, and what things John and Rambo carry in their bags at all times.
165: “It’s not the technology, it’s the people”
57 min
John and Rambo discuss software quality trends, async functions and unit testing, Apple’s approach to private data with CloudKit, and dealing with technical debt.
164: “Your wattage may vary”
1 hr 25 min
It’s time for the first ever Stacktrace Headphone Holiday Guide! Along with discussions about writing technical articles, view models and the MVVM design pattern, and using Swift actors to solve race conditions and data races.
163: “The Rambo Objective-C Manifest”
1 hr 13 min
Rambo shares his set of principles for when and how to rewrite existing Objective-C code in Swift, John talks about his preferred workshop formats, and the two discuss the current state of Apple’s services.
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