Have Claude Code make a fast macOS markdown viewer
A developer used Claude Code to create a markdown viewer for macOS that opens files very quickly.
- What they did
- The developer asked Claude Code, running Opus 5.5, to build a macOS markdown viewer with opening speed as the main goal. It was built alongside their JSON viewer project, but no extra prompting details were given. The request was simple: make it open markdown files as fast as possible.
- How it went
- They say the finished app brings up and renders a markdown file instantly. In their view, it outpaces every other macOS app they have tried, and it even beats the speed of Bitwarden’s Chrome extension showing its fill panel. No formal timing data was shared.
- Tips
- If you care about launch speed, make that the central requirement up front. Ask the agent to pause before any destructive change, and request a way to verify performance after the build.
Try it yourself with Claude Code
Create a macOS app that opens .md files with minimal delay and displays them cleanly. Use [Swift / your preferred stack], keep startup lean, and avoid heavy libraries. Include [dark mode / live reload / syntax highlighting / any features you want], but prioritize instant opening over everything else. When the app is finished, explain how to add it to macOS and make it the default app for markdown files, then describe how you tested its launch speed. Stop and ask before you remove, replace, or submit any files or settings.
Fill in the [brackets]. Agents can make mistakes, so review anything before it is sent, paid or deleted.
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