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Articles by Gui Rambo
210: ”Just bytes in a pipe”
210: ”Just bytes in a pipe” 01:12:47, published 2026-08-25 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. Links
209: “False positives or positive negatives”
209: “False positives or positive negatives” 00:48:28, published 2026-07-31 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. Links
208: “You are the compiler”
208: “You are the compiler” 01:07:07, published 2026-06-22 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. Links
207: “It’s not magic, it’s all in the kernel”
207: “It’s not magic, it’s all in the kernel” 01:10:19, published 2026-05-13 John builds a cross-platform UI framework in Rust, and Rambo uses the macOS virtualization system to create a virtual iPhone. Links
206: “Let’s deprecate Xcode projects”
206: “Let’s deprecate Xcode projects” 00:53:19, published 2026-04-08 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. Links
205: “The 2026 edition”
205: “The 2026 edition” 01:06:13, published 2026-03-11 Stacktrace is back (again)! But this time, we’re here to stay, at least for the time being, with a new monthly schedule. 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. Links
118: “The real reality is gone” 00:55:01, published 2021-01-13 Rambo goes indie, John realizes once again how important breaks are, and the two discuss the latest rumors around Apple’s AR glasses in great detail, all the way down to the API design level. It’s Stacktrace, after all. Links
153: “California Streaming” 01:05:23, published 2021-09-15 John and Rambo share their first impressions of the products announced at Apple’s “California Streaming” event — including the iPhone 13 lineup, the new iPad "Classic" and iPad mini, and the Apple Watch Series 7. Sponsor iMazing: Get the Swiss Army Knife of iOS device management for Mac and Windows 30% off for a limited time. Links
93: “Life is not paper” 00:57:29, published 2020-07-22 Rambo shuts down two of his projects and battles Dark Mode on macOS, John re-evaluates his goals and work priorities, and the two discuss the big Twitter hack, engineering management, and whether Apple has changed their strategy around when to ship new features. Links
80: “You versus the magnets”
80: “You versus the magnets” 01:11:04, published 2020-04-22 John writes Javascript encryption code and reviews Apple’s new Magic Keyboard for the iPad Pro, Rambo reveals an exclusive new AirBuddy feature coming in version 2.0, and the two talk about the new iPhone SE, Apple’s upcoming remote accessibility event, and much more. Links
87: “An ARM and a leg”
87: “An ARM and a leg” 01:17:06, published 2020-06-10 A deep dive into the iOS background operations model and how it could potentially be improved, rumors about both ARM Macs and a new iMac design being unveiled at WWDC20, and a discussion around designing custom systems for apps. That, and your regular updates from both John and Rambo, on this week’s episode of Stacktrace. Links
83: “When you link a framework...”
83: “When you link a framework...” 01:07:03, published 2020-05-13 The recent Facebook SDK crashing incident leads John and Rambo into a deep-dive on third party SDKs and various ways to handle them. Also, new thoughts and details on the rumored AirPods Studio headphones, how writing about a topic can make you re-examine your opinions on it, and the launch of FusionCast. Sponsor Bitrise: iOS Continuous Integration and Delivery for building better applications, faster.
99: “Untangle some spaghetti”
99: “Untangle some spaghetti” 01:07:46, published 2020-09-02 Behind the scenes of building an App Clip, progressive disclosure when designing UIs, Rambo's struggles with App Translocation on macOS, and speculation around what Apple might have in store for us this fall. Links
85: “Magnetic mumbo jumbo”
85: “Magnetic mumbo jumbo” 01:17:57, published 2020-05-27 What could an iPhone without any ports look like, and is it likely that Apple would ever adopt USB-C for the iPhone? Also, Mac development, using multiple programming languages, sharing utilities between projects, and much more. Sponsor ZeroSSL: A new, completely free and trusted certificate authority and SSL Platform, aiming to make it easy and extremely affordable to create SSL certificates.Try ZeroSSL today for free. Links
89: “Did you wash your hands?”, a WWDC 2020 special
89: “Did you wash your hands?”, a WWDC 2020 special 01:36:54, published 2020-06-24 On this WWDC20 special, John and Rambo start diving into the main announcements from Apple’s conference, focusing on iOS, App Clips, Widgets, Siri, Maps, watchOS, AirPods and iPadOS. Sponsor MacStadium: Get 50% off the first six months of a Mac mini subscription with code WWDC2020. Links
82: “The Ministry of iOS Development”
01:00:36, published 2020-05-06 John automates the deployment of his website, which just celebrated its third birthday (or is it “anniversary”?), Rambo is about to launch a new app, and the two go on a deep dive into the iOS 13.5 beta and Apple + Google’s “Exposure notification” system for tracking the spread of COVID-19. Sponsor Bitrise: iOS Continuous Integration and Delivery for building better applications, faster. Sign up for free and learn more here.
84: “We traversed the whole responder chain”
84: “We traversed the whole responder chain” 01:12:37, published 2020-05-20 This week, John and Rambo go on a deep dive into the responder chain and how UI events are propagated on Apple’s platforms. Also, SwiftUI vs Catalyst, Apple’s mysterious new QR codes for AR, and a visit to the Sundell R&D division. Sponsors Links
92: “App Store review lawyer”
92: “App Store review lawyer” 01:08:19, published 2020-07-15 After an accidental deep dive into SwiftUI, John and Rambo discuss the recent issues with Facebook’s iOS SDK and whether Apple should force developers to adopt more platform features. Then, this episode’s actual deep dive, into backend-driven UIs. Links
90: “Adaptive lightning”
90: “Adaptive lightning” 01:07:09, published 2020-07-02 The macOS Big Sur redesign doesn’t mean the end of the world, right? Or does it? John and Rambo discuss the reveal of Apple Silicon, macOS 11, iOS apps coming to the Mac, and much more — all during a recording session stretched out over two days in the middle of a Brazilian lightning storm. Links
86: “Into the void of the internet”
01:02:43, published 2020-06-03 Preparations for WWDC, a look at the first COVID-19 exposure notification apps powered by Apple and Google’s system, and a deep dive into the world of Reactive Programming through frameworks like RxSwift and Combine. Also, will cross-platform technologies like Flutter ever take over native iOS development?
91: “Just check the checkbox”
91: “Just check the checkbox” 01:08:31, published 2020-07-08 After a bit of speculation as to whether or not Apple will ship this year’s iPhone without a charger, John and Rambo go on a deep dive into SwiftUI state management, and discuss various approaches for sharing code between an app and an extension. Links
WWDC by Sundell & Friends #1: Keynote and Platforms State of the Union first impressions
00:23:00, published 2020-06-18 John and Gui Rambo share their first impressions of Apple’s WWDC20 opening keynote, as well as the Platforms State of the Union session. This is the WWDC by Sundell & Friends podcast, . Did Apple’s first ever online keynote live up to our expectations, which of the announcements were the most exciting, and what technologies are we looking forward to dive deeper into during the week?
95: “We’re not lawyers”
95: “We’re not lawyers” 01:15:08, published 2020-08-05 What differentiates server-side and client-side development, Tim Cook’s testimony in front of the US Congress, the new iMac, Rambo’s secret new project, and more on John’s not-so-secret use of SwiftUI to build games. Sponsor iMazing: Get 30% off iMazing, the most popular all-purpose iPhone and iPad manager for Mac and PC. Links
96: “The Pandora’s Box of software”
96: “The Pandora’s Box of software” 01:03:47, published 2020-08-12 Combining SwiftUI with other rendering technologies, Rambo’s preparations for the launch of the AirBuddy 2.0 Beta, and lots of thoughts on the recent App Store controversy involving Microsoft’s xCloud game streaming service. Also, custom Swift keywords, yay or nay? Sponsor iMazing: Get 30% off iMazing, the most popular all-purpose iPhone and iPad manager for Mac and PC. Links
111: “Mini reviews, maximum reviews”
111: “Mini reviews, maximum reviews” 01:25:49, published 2020-11-25 John reviews the M1 Mac mini, and Rambo reviews the iPhone 12 mini. Two “mini products” that turn out to be not very mini in terms of performance. What’s it like using an M1 Mac for tasks like iOS development, and does the iPhone 12 mini feel like a proper flagship phone in 2020? Sponsor Links
131: “Apple product therapy”
131: “Apple product therapy” 01:18:54, published 2021-04-14 It’s finally time for another round of Apple Event Keynote Poker, with John and Rambo placing their bets as to what Apple might announce during their “Spring Loaded” event on April 20th. Also, the power of HTTP, SwiftUI for AR, Swift’s Result Builders feature, and more. Sponsors Links
100: “It was all planned”
100: “It was all planned” 01:10:22, published 2020-09-09 On this special 100th episode of the show, John and Rambo reflect on their personal milestones since episode one, and play another round of Apple Keynote Poker in preparation for next week’s Apple event. Links
114: “The invisible Bluetooth wire”
114: “The invisible Bluetooth wire” 01:07:07, published 2020-12-17 An accidental deep dive into how the AirPods’ transparency mode is activated over Bluetooth, the launch of Swift by Sundell 3.0, running macOS code in the cloud, multiple headphone reviews and a comparison between the iPhone 12 Pro and 12 mini. Links
108: “The future could be next week”, the November 2020 Apple Keynote Poker special
01:08:38, published 2020-11-04 It’s time for John and Rambo to place their bets on what Apple might announce at their upcoming “One More Thing” event. Will we see the first Apple Silicon-powered Macs, and if so, which ones, and what features will they have? Also, artisanal, hand-crafted JSON from Brazil, and computer-generated CSS from Poland. Sponsors Survivor: Refined Rugged protection for all iPhone 12 models. Appfigures: The tools you need to monitor, optimize, and get more downloads.
134: “Overthinking is the enemy of shipping”
00:56:13, published 2021-05-05 After checking in on the progress of Rambo HQ 2.0 and a visit to John’s Static Site Generation Corner, John and Rambo briefly discuss the ongoing trial between Apple and Epic Games, and then dive into topics like project planning and how to pick what server-side framework to use for a new project.
115: “Not a trace of a stack”
00:30:42, published 2020-12-23 On the first ever completely non-technical episode of Stacktrace, John and Rambo answer #askstacktrace questions about everything from local holiday traditions to what their favorite airplanes are. Sponsor MacStadium: Get a cloud hosted M1 Mac mini from $99 or use promo code 9TO5MAC for half off the first two months of a Gen 3 or 4 (Intel) mini. Enter the Mac mini giveaway here.
97: “You can’t be Springboard”
97: “You can’t be Springboard” 01:12:44, published 2020-08-19 Analysis of the ongoing battle between Apple and Epic Games from a technical perspective, the benefit of writing cross-platform Swift code, logging and debugging strategies, and how Rambo merged two apps into one. Sponsor iMazing: Get 30% off iMazing, the most popular all-purpose iPhone and iPad manager for Mac and PC. Links
“Swift++” | Stacktrace
123: “Swift++” 00:46:25, published 2021-02-17 After a deep dive into various ways of making Swift interact with C++ code, as well as the latest AirBuddy and humidifier hack updates, John and Rambo discuss the recent discontinuation of Swift for TensorFlow, and whether open sourcing commercial projects is a good idea. Links
121: “Debug-driven development”
01:05:47, published 2021-02-03 John and Rambo discuss some of the key new features that are being introduced in iOS 14.5 and Xcode 12.5, as well as their preferred debugging workflows, and how to deal with tech debt and refactoring in a pragmatic and sustainable way. Sponsors Guardian Firewall: Advanced security and privacy control for your iPhone and iPad, powered by the team who spent years reverse-engineering iOS to help you take back control.
125: “Build pipelines, not spiderwebs”
125: “Build pipelines, not spiderwebs” 01:07:32, published 2021-03-03 Localizing an indie app, the stability of SwiftUI previews, various ways of storing and handling app data, and whether Apple might be building a general-purpose cloud computing platform. Sponsor Pillow: Pillow is an all-in-one sleep tracking solution to help you get a better night’s sleep. Download it from the App Store today. Links
135: “No overview available”
01:19:57, published 2021-05-12 John and Rambo go on a deep dive into Plot’s new SwiftUI-like API for building HTML pages, and discuss 3D printing, API evolution and documentation, whether Apple ever considered letting third party developers ship apps outside of the iOS App Store, and how to pick what projects to pursue. Sponsors Pillow: Pillow is an all-in-one sleep tracking solution to help you get a better night’s sleep. Download it from the App Store today.
98: “A chip volcano”
98: “A chip volcano” 01:01:38, published 2020-08-26 A deep dive into syncing systems and what goes into writing code for synchronizing user data using tools like CloudKit, a look under the hood of what AirPower could’ve been, and your regular weekly updates from John and Rambo. Sponsor Links
128: “They backed themselves into a home corner”
128: “They backed themselves into a home corner” 01:00:35, published 2021-03-24 Rambo launches a new app, John has thoughts about SwiftUI’s heavy usage of Swift’s type system, and it turns out that there might be more to the HomePod mini than meets the eye. Sponsors Pillow: Pillow is an all-in-one sleep tracking solution to help you get a better night’s sleep. Download it from the App Store today. Links
116: “It wasn’t just a big, long nightmare”, the 2020 Stacktrace retrospective
00:36:24, published 2020-12-30 On this second Stacktrace holiday special, John and Rambo look back at the past year and what some of the highlights were among the hectic, strange rollercoaster ride that 2020 has been. Sponsor MacStadium: Get a cloud hosted M1 Mac mini from $99 or use promo code 9TO5MAC for half off the first two months of a Gen 3 or 4 (Intel) mini. Enter the Mac mini giveaway here.
101: “The iPad Prosumer”
01:18:04, published 2020-09-16 It’s Apple event analysis time! John and Rambo discuss all of the major announcements from Apple’s “Time Flies” event — including the Apple Watch Series 6 and SE, the new iPads, and of course, the surprise release of iOS 14. Sponsor DEVONthink: Manage your documents the smart way on Mac and iOS. Get 10% off with code 9to5mac-2020.
119: “Swift spelunking”
119: “Swift spelunking” 00:55:44, published 2021-01-20 John and Rambo react to the latest Mac and iPhone rumors, design a new feature for AirBuddy, talk about Swift Evolution and not-quite-public language features, and discuss various ways of using frameworks and libraries on Apple’s platforms. Links
126: “Leaving iOS behind”
01:08:13, published 2021-03-10 Rambo picks up Android development, John is continuing to turn into a Mac developer, and the two discuss the recent discontinuation of the iMac Pro and how developers can improve the way they communicate with other team members. Sponsor Pillow: Pillow is an all-in-one sleep tracking solution to help you get a better night’s sleep. Download it from the App Store today.
122: “Raised in a hardware household”
01:08:46, published 2021-02-10 Rambo hacks a humidifier, John is excited about linting and continuous integration, and the two discuss the most recent set of exposed App Store scams and what Apple could do to improve the situation. Also, SwiftUI jobs and minimum deployment targets. Sponsors Funn Media: Live a healthier life with Funn Media's collection of apps for iPhone, iPad, Mac, and Apple Watch, including Calory, WaterMinder, and more.
102: “It compiles — ship it!” | Stacktrace
102: “It compiles — ship it!” 00:54:32, published 2020-09-23 Building responsive app UIs, the launch of iOS 14, and thoughts on the Apple One bundle and some of its international pricing. Also, the return of both #askstacktrace and Stacktrace Arcade, as well as how using iCloud might affect the transferability of an app. Sponsor Links
148: “Do you have a plan for Apple?”
148: “Do you have a plan for Apple?” 01:04:30, published 2021-08-11 John’s new iPad development setup, Rambo’s widget layout challenges, and Apple’s (lack of a strong) home device strategy. Also, managing deadlines, maintaining SwiftUI views across multiple system versions, and continuous integration. Sponsor Pillow: Pillow is an all-in-one sleep tracking solution to help you get a better night’s sleep. Download it from the App Store today. Links
105: “An old man yelling at an iCloud”, the October 2020 Apple event review
01:25:58, published 2020-10-14 On this extra long episode of Stacktrace, John and Rambo discuss all of the exciting new announcements from Apple’s October 2020 event, including the new iPhones, the new HomePod Mini, and more. Also, John is building a major new feature for his website and Rambo launches the pre-orders for AirBuddy 2. Sponsors Appfigures: : The tools you need to monitor, optimize, and get more downloads. Use code Stack3030 to get 30% off for the next 3 months.
138: “WWDC21 Keynote Poker”
138: “WWDC21 Keynote Poker” 01:35:51, published 2021-06-02 It’s time for another game of Stacktrace Keynote Poker! This time, John and Rambo place their bets on what Apple might announce at WWDC21, either during the main keynote, or as part of the more developer-focused State of the Union. Sponsors Links
136: “Cascading Device Sheets”
136: “Cascading Device Sheets” 00:58:06, published 2021-05-19 After narrowly avoiding an accidental web development deep dive, John and Rambo discuss the challenges of open source maintenance, AirBuddy’s upcoming battery notifications feature, the latest Mac-related rumors, and the new Apple Music hi-fi update. Sponsor Pillow: Pillow is an all-in-one sleep tracking solution to help you get a better night’s sleep. Download it from the App Store today. Links
117: “The best not-kept secret”
00:41:37, published 2021-01-06 On the final holiday special for this year (or, last year?), John and Rambo discuss their expectations for 2021, and what products and new developer tools that they hope to see from Apple during this new year. Sponsor MacStadium: Get a cloud hosted M1 Mac mini from $99 or use promo code 9TO5MAC for half off the first two months of a Gen 3 or 4 (Intel) mini. Enter the Mac mini giveaway here. Links AirTags expectations Swift Package Manager
129: “Dependencies gone wild”
129: “Dependencies gone wild” 01:01:53, published 2021-03-31 John is excited about SwiftUI animations, Rambo updates the unofficial WWDC app, Xiaomi resurrects AirPower, and Apple announces WWDC21. Also, the latest Apple TV rumors, and what’s good to keep in mind when hosting a Hackathon. Sponsor Links
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