15:I[981,["658","static/chunks/658-a698693f56d0116a.js","183","static/chunks/183-6beeeb801c274aaa.js","474","static/chunks/app/%5Btype%5D/layout-631c4730b83c8223.js"],"Posts"] 16:T43d,Hi HN! I built VibeMail, an email template editor that combines MJML with Claude AI to make creating (vibing) responsive HTML emails actually enjoyable.

The interesting bits:

- Three-panel layout: Monaco code editor, live preview, and Claude chat side-by-side

- AST-based code navigation: double-click text in the preview to jump to the exact line in the editor

- Multiple AI "agents" with full conversation rollback (inspired by Cursor's chat history)

- Project/email organization with a file-system-like structure

- Everything runs locally – your API key and templates never leave your browser

- I built the whole thing in a day: maybe 5hrs. Simon Willison is onto emerging with the personal software thing.

Tech stack: React, Vite, TypeScript, Zustand, MJML, Monaco Editor, and Claude Sonnet.

Fun fact: I prototyped the entire thing in ~10 minutes using Cursor and Claude Sonnet 4.5, which was a fun experiment in AI-assisted development. The hardest part was getting the AST parsing right for the code navigation feature.

Open to feedback!17:T5fb,I built 6,000+ agentic AIs that show how our power grid can take a much-needed massive leap forward.

I created a Virtual Power Plant simulation based on Austin's grid. VPPs are networks of controllable energy devices, such as batteries, EVs, and smart thermostats, that work together. The website takes you through a tutorial explaining all the pieces that come together in a VPP.

The bottleneck of our grid isn't generation, but transmission. In Texas, almost half of the cost of energy is transmission. Generation is getting cheaper and cheaper, and transmission is getting more and more expensive as the grid ages and we don’t do anything about it.

The solution? To hyperlocalize energy generation and storage. Virtual power plants will be critical t

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