I kept tabbing out to ChatGPT every time I wanted to fix grammar, change tone, or brainstorm a sentence, so I used Claude Code to build a lightweight browser writing assistant called Magic Pen. It opens with a hotkey on top of any site, so right now it can:
- rewrite selected text
- fix grammar / clarity / tone
- open a small chat panel for quick questions or brainstorming
- do local voice-to-text
- use Gemini Nano locally if you already have it set up in Chrome I tried to keep it fast and boring in a good way: no giant dashboard, just something I can pop open while writing emails, docs, posts, etc. Full disclosure: I made it. There’s a free local-use path, plus optional premium / BYOK if you want hosted models or your own keys. Claude Code was especially useful for the extension plumbing, prompt UX, and debugging weird site-specific edge cases. If people want, I can also share the Claude Code workflow / prompts I used while building it. Would love blunt feedback:
- is this actually useful enough to install?
- what feature would make something like this a daily-use tool? https://chromewebstore.google.com/search/Magic Pen AI - Free AI Writing Assistant submitted by /u/EggNo4904
Originally posted by u/EggNo4904 on r/ClaudeCode
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