[macOS] Recording Microphone and System Audio Together with QuickTime Player
How to record both microphone input and system audio simultaneously in QuickTime Player using BlackHole.
Recent posts
[macOS] Building a Claude Code Voice Assistant in the Small Hours
Building a macOS assistant demo that relays Claude Code CLI’s input and output through voice on a sleepless night
[Code Quality] Building Automated PR Code Review with Claude
A story of building automated GitHub PR review with Claude Code Action for a side project.
[iOS] Placing and Rotating Circular Menu Items with Trigonometry
How to place and rotate circular menu items using sin, cos, and atan2 in iOS.
[Column] Running a Tech Blog in the AI Era
Running a trilingual blog when your Japanese doesn’t go beyond travel phrases. How AI has transformed the way tech blogs are run.
[Jekyll] Implementing Multilingual Support (KO/EN/JA) Without Plugins
Sharing the experience of implementing Korean, English, and Japanese support in a Jekyll blog with the Minimal Mistakes theme — without any plugins.
[iOS] Modular Architecture with CocoaPods Private Spec Repos
How to modularize an iOS project into layered modules using CocoaPods Private Spec Repos.
[Column] ‘We Can’t Build It Without a Developer’ No Longer Holds
AI coding tools have completely reshaped developer scarcity. Where does a developer’s value lie now?
[macOS] Building a Claude Code Monitor with Claude Code
Sharing the experience of building a macOS menu bar app that monitors Claude Code’s own usage — using Claude Code itself.
[macOS] Setting Up Obsidian MCP Integration
How to set up an MCP server so Claude Code can directly read and write to your Obsidian vault.
[Xcode] Setting Up MCP Servers for the Agentic Coding Assistant
A guide to connecting MCP servers to the Xcode agentic coding assistant.
[Synology] Setting Up an L2TP/IPSec VPN Server
A guide to setting up an L2TP/IPSec VPN server on a Synology NAS and connecting from outside.
[Xcode] Using Claude Opus 4.6 in Xcode 26.3
How to configure Xcode 26.3 to use the Claude Opus 4.6 model as an agentic coding assistant.
[Java] Installing OpenJDK
How to install Eclipse Temurin OpenJDK on macOS using Homebrew.
[Ruby] Displaying Gem Paths in Bundle
How to check gem paths in Bundler.
[Ruby] Installing Ruby
How to install Ruby using rbenv on macOS.
[macOS] Fixing Visual Studio Code’s code Shell Command Not Working on macOS 12.3
A guide on how to fix the issue where VS Code’s code command stops working due to the removal of Python 2 in macOS 12.3.
[Jekyll] Changing Word Break Properties in the Minimal Mistakes Theme
How to change word break properties in the Minimal Mistakes theme to fix horizontal scrolling on mobile.
[CI/CD] Disabling fastlane Update Check and Changelog Logs
How to disable fastlane’s update check log and changelog log.
[Jekyll] Running a Local Server with a Specific IP and Port
How to run a Jekyll local server with a specific IP address and port.
[CI/CD] Creating a fastlane Plugin
How to create and distribute a custom fastlane Plugin.
[CI/CD] Creating a fastlane Action
How to create a custom fastlane Action.
[Router] How to Enable HTTPS on ASUS Router Settings Page
A guide on how to enable HTTPS for the ASUS router settings page.
[macOS] Copying a Path in Finder
The keyboard shortcut for copying a file or folder path in macOS Finder.
[CI/CD] Using fastlane Plugins
How to add and manage fastlane plugins.
[Python] Installing PIP
How to install PIP, the package manager for Python 3.
[CI/CD] Installing fastlane
How to install fastlane on macOS.
[macOS] Fixing the Spaces Order
How to fix the order of Spaces in Mission Control on macOS.
[macOS] Opening Visual Studio Code from the Command Line
How to open Visual Studio Code from the terminal on macOS.
[macOS] Installing the Alfred TimeZones Workflow
How to install and use the Alfred TimeZones Workflow on macOS.
[macOS] Generating SSH Keys
How to generate SSH keys on macOS using ssh-keygen.
[Git] Using Multiple SSH Keys on GitHub
How to use multiple SSH keys on GitHub.
[Apple] Keynote - September 14, 2021
A summary of the new devices and services announced at the Apple September 2021 keynote.
[Xcode] Building for iOS 15 Devices with Xcode 12
How to deploy builds to iOS 15 or iPadOS 15 devices using Xcode 12.
[macOS] Installing the Zsh Autosuggestions Plugin
How to install the zsh-autosuggestions plugin on macOS.
[macOS] Installing the Zsh Alien Theme
How to install the Alien theme for Oh My Zsh on macOS.
[macOS] Installing Oh My Zsh
How to install Oh My Zsh on macOS.
[Git] Installing Git LFS
How to install and set up Git LFS on macOS.
[Ruby] Installing Homebrew
How to install Homebrew on macOS.
[CocoaPods] Installing CocoaPods
How to install CocoaPods on macOS.
[Synology] Manually Renewing SSL Certificates via Command Line
A guide on how to manually renew SSL certificates on a Synology NAS.
[Mathematics] Prime Numbers and Composite Numbers
An overview of the concepts of prime numbers and composite numbers.
[Objective-C] Class and Method, Instance
A summary of classes, methods, and instances in Objective-C.
[SmartHome] SmartThings Hub 3rd Generation Purchase Review
A review of purchasing the SmartThings Hub v3.
[SmartHome] Planning a Convenient and Comfortable Smart Home
A summary of the plan for building a convenient and comfortable smart home infrastructure.
[Synology] Connecting a Custom Domain to Photo Station
A guide on how to connect a custom domain to Synology Photo Station.
[Objective-C] Branch Statements
A summary of branch statements in Objective-C.
[Objective-C] Loop Statements
A summary of loop statements in Objective-C.
[Spring] Setting Up a Spring 5 Development Environment
How to set up a Spring 5 development environment.
[Objective-C] Operators and Expressions
A summary of operators and expressions in Objective-C.
[Objective-C] Primitive Data Types
A summary of primitive data types in Objective-C.
[Objective-C] Study Resource Collections
A curated list of useful study resources for learning Objective-C.
[iOS] Handling the iOS 13 View Controller Modal Presentation Style Change
How to handle the default Modal Presentation Style change introduced in iOS 13.