The latest articles on DEV Community by Leo Cardz (@leocardz). https://dev.to/leocardz https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3793638%2Fc0047687-731f-41b1-a42b-e9e0e48983cb.png https://dev.to/leocardz en Leo Cardz Thu, 26 Feb 2026 13:24:23 +0000 https://dev.to/leocardz/i-built-a-native-macos-companion-app-for-claude-code-in-a-weekend-2hcg https://dev.to/leocardz/i-built-a-native-macos-companion-app-for-claude-code-in-a-weekend-2hcg <h2> The problem </h2> <p>If you use Claude Code, all your sessions are stored locally as JSONL files. There's no built-in way to go back and browse them, search through old conversations, check what files were changed, or revisit commands you ran.</p> <p>I kept opening JSONL files manually, and it wasn't a great experience.</p> <h2> The solution </h2> <p>I built <strong>Poirot</strong>. A native macOS app that reads your local Claude Code data and gives you a proper interface for everything.</p> <p> <iframe src="https://www.youtube.com/embed/JLvNSRZrxdo"> </iframe> </p> <h2> What it does </h2> <ul> <li> <strong>Session browser</strong>: All your sessions grouped by project, with timestamps, token counts, and model info</li> <li> <strong>Rich conversation view</strong>: Markdown rendering, syntax highlighting, collapsible tool blocks, code diffs</li> <li> <strong>Extended thinking</strong>: See Claude's reasoning process in collapsible blocks</li> <li> <strong>Fuzzy search (⌘K)</strong>: Search across all sessions, commands, skills, and configs</li> <li> <strong>Config dashboard</strong>: Browse your slash commands, skills, MCP servers, models, sub-agents, plugins, and output styles</li> <li> <strong>One-click open</strong>: Open any file in VS Code, Cursor, Xcode, or Zed. Copy or re-run any Bash command in your terminal</li> </ul> <p><strong>No login. No tracking. No analytics. No API key needed. No extra cost. Runs fully offline. Under 6 MB.</strong></p> <p><a href="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fbaa97epvl9hg139uh5gi.png" class="article-body-image-wrapper"><img src="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fbaa97epvl9hg139uh5gi.png" alt="Poirot code diff view showing a TranscriptParser refactor from completion handlers to async/await, with red/green inline diff highlighting"></a><br> <a href="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fiuwehrvspowjt16lba9h.png" class="article-body-image-wrapper"><img src="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fiuwehrvspowjt16lba9h.png" alt="Poirot MCP Servers dashboard showing configured servers like Figma, GitHub, Notion, Playwright, and Perplexity with their connection details and available tools"></a></p> <h2> The tech stack </h2> <ul> <li>Swift 6 with strict concurrency</li> <li>SwiftUI with <code>@Observable</code> (no <code>ObservableObject</code>)</li> <li> <code>@MainActor</code> default isolation</li> <li>Protocol-driven DI via SwiftUI <code>EnvironmentValues</code> </li> <li>MarkdownUI + HighlightSwift for rendering</li> <li>Swift Testing for tests</li> <li>Custom JSONL parser and real-time file watching with GCD</li> </ul> <h2> The story </h2> <p>The whole thing was vibe-coded in a weekend using Claude Code itself. What started as "I wonder if I can build a companion app for Claude Code using Claude Code" turned into a real tool that I use daily.</p> <p>Named after Hercule Poirot, Agatha Christie's detective because every investigation needs the right tools.</p> <h2> Try it </h2> <ul> <li><a href="https://github.com/LeonardoCardoso/Poirot" rel="noopener noreferrer">https://github.com/LeonardoCardoso/Poirot</a></li> <li><a href="https://poirot.fyi" rel="noopener noreferrer">https://poirot.fyi</a></li> </ul> <p>Open source (MIT). Feedback and contributions welcome.</p> ai swift opensource vibecoding