Lumens - A Markdown studio for people who care how words look.
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Lumens is a Markdown studio for people who care how words look. Write on one side, watch a typeset page appear on the other, with math, Mermaid diagrams and code. Read it in Book mode, present it as slides, export a PDF with a cover. Works offline, no account.
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Hey Product Hunt! I'm Sonu, a solo developer from India, and I built Lumens.
I kept copying answers out of ChatGPT and Claude and fighting the formatting: broken tables, maths that didn't render, diagrams that showed up as raw code. I wanted one place to paste AI output and get a document I'd actually be proud to send.
What Lumens does:
Paste Markdown from any AI and get a clean, typeset page instantly
Tables, maths and Mermaid diagrams just work
Book mode lays your writing out like a printed page, and the same file turns into a slide deck
Export to PDF or HTML, with themes to match your style
Free, works offline, no account, and your text never leaves your device
You can install it as an app straight from your browser.
It's early, so I'd love honest feedback: what do you paste into it, and where does that text need to go next?