Shipping an Expo app to the App Store: the landmines nobody warns you about
I recently shipped Add to Calendar: AI Events — an iOS app that turns screenshots and text into calendar events — built with Expo SDK 52 and React Nat…
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Benchmark an AI Coding Task Across Mobile Backgrounding, Network Switches, and Battery Pressure
Most AI coding assistants are demoed on a desk: laptop plugged in, stable Wi-Fi, full attention. But the moment I approve or monitor a long-running AI…
Benchmark Mobile AI Reconnect Recovery Across Lifecycle Transitions With a Server You Can Kill
Last week I was testing an AI chat feature on my iPhone 14 (iOS 17.5, React Native 0.74, Hermes). The flow looked fine on Wi-Fi. Then I walked into an…
CamBridge: giving the iOS Simulator a real, moving camera image
The problem Neither the iOS Simulator nor the Android Emulator has real camera hardware. If you're building anything that touches AVCaptureSession — a…
Coordinate-based UI tests break. So we read the accessibility tree instead — from inside the simulator.
Every recorded mobile test I have ever inherited died the same way: someone moved a button. The recording said "tap at (340, 712)". The redesign moved…
Port Support You Can Trace Back to a Green Test
“Supported on iOS, Android, desktop, and web” sounds useful until you need one method on one target. Does WebSocket work on watchOS? Which Linux archi…
Three App Store Connect API Hard Limits That Only Bite at a Fast Release Cadence
Originally published on hexisteme notes . I shipped seven versions of my apps in thirty days by scripting the App Store Connect API end to end — build…
Test Apple Health Permission Revocation Across the iOS App Lifecycle
Start with one device and one transition: permission is available, the app enters the background, the person changes access, and the app returns to th…
The Crash That Only Happened Sometimes — A SwiftUI Bug
This is a submission for DEV's Summer Bug Smash: Smash Stories powered by Sentry . I spent three hours debugging a SwiftUI crash that felt completely …
AR And VR In Java: ARKit, ARCore, And A Virtual Room You Can Debug
This week's release post was about making the VM fast. Today's post is about pointing that VM at the real world. PR #5335 adds two new core packages: …
Part 4 — Tags, ratings, and richer rows
Part 4 — Tags, ratings, and richer rows Level: Intermediate · Time: ~20 minutes · Builds on: Part 3 — Custom themes, multi-window, and polish · Series…
I Got Tired of Hand-Translating Xcode Plists, So I Built a Tiny Free Tool to Do It On-Device
If you've ever localized an iOS or macOS app, you know the drill: you've got a .plist file full of UI strings sitting in Base.lproj , and now you need…
How We Beat HotSpot Performance (By Cheating, But Not Like That)
No, we didn't cheat in the benchmark. At least I hope we didn't. Every optimization in this story was gated on bit identical output checksums against …
Part 2 — Search, palette, and settings
Part 2 — Search, palette, and settings Level: Intermediate · Time: ~35 minutes · Builds on: Part 1 — Contacts app Part 1 got you shipping. This one ge…
Keep Agent Logs Out of Mobile Cloud Backups on iOS and Android
A mobile client may store agent prompts, repository paths, diffs, command output, and downloaded artifacts. Protecting the live app sandbox is not eno…
What Makes Healthcare App Testing Different from Every Other App Category
A patient opens their prescription and sees 500mg instead of 50mg. A lab report displays "Normal" when the value is critically high. A teleconsult dis…
Versioned Builds Are Back, With Master Builds For Fast Verification
Versioned builds are back. What is Codename One? Codename One is an open-source framework for building native iOS, Android, desktop, and web apps from…
How I export 1.2-gigapixel images on an iPhone without running out of memory
Rendering a big image on iOS is one of those things that looks trivial until your app gets killed by the OS mid-export. CGContext , draw, makeImage() …
Motion, Stylus, Trackpads And Foldables In The Core
For a long time, mobile meant a touch screen and a few platform-specific escape hatches. That is no longer enough. A Codename One app can run on phone…
Why I Still Test In Safari First (And The Bugs It Catches Early)
Yes, I Still Open Safari First I build and test new frontend work in Safari first. On purpose. Repeatedly. Sober. I know that sounds backwards. Everyo…
Introducing App Store Release Agent – Automating my App Store Pipeline
Publishing ten apps in four months sounds good. And it is good. It means the bottleneck is no longer building the app. With AI-assisted coding, small …
More Surfaces, Same Deal: Cars, Sensors, Commerce, Video And Builds
Last week's release post was about funding open source without the bait and switch. This week's release tests that idea again, because two of the new …
Bypassing Activation Lock via Device-to-Device Migration: A Retrospective Analysis
TL;DR: In June 2026, I encountered a real-world scenario where an iPhone 13 (iOS 18.6), fraudulently locked via a phishing attack, could be fully unlo…
Testing In-App Chat and Customer Support Flows in Delivery Apps
The help button is the most important button in your delivery app that your QA team almost never clicks during regression. Every delivery app has an i…
Apple TV And Android TV: One Codebase, And CSS @media For The Living Room
This is the Tuesday follow-up to Friday's funding open source without the bait and switch , and it picks up right where last week's Apple Watch port l…
How screenshot detection works on iOS
Detecting a screenshot on iOS starts with a single UIKit notification. That is the last easy part. UIApplication.userDidTakeScreenshotNotification tel…
Stop Rebuilding the Same SwiftUI Components: A Guide to DesignFoundation
"I'll just write a quick button style... and a text field with validation... and a card component..." Two weeks later you have a bespoke design system…
Stop Rebuilding Auth, Onboarding, and Dashboards: DesignFoundationPro
Part 2 of 2. This tutorial builds on Part 1 — DesignFoundation core . If you haven't added the base package and theme yet, start there. The core packa…
A Privacy-First Analytics API: One Facade, A Provider SPI, And A Consent Gate
On Friday I wrote about funding open source without the bait and switch , and the analytics API in PR #5266 is the clearest example of the model in th…
Rich Text And Code Editing: RichTextArea And A Syntax-Highlighting CodeEditor
Friday's post covered how we fund this work without the bait-and-switch; today is the engineering side of the same week, with two new visual editors. …