Dongzihang

Building ToolKnit: free browser tools for PDFs, images, text, video, and audio. I improve the toolkit through real user feedback. Explore it at https://toolknit.com

Recent activity

I built 90 free browser tools in 115 days. Here's what I learned as a solo dev.

I built Toolknit: a free, privacy-first toolbox for everyday tasks (60+ tools, no uploads, no sign-ups)

Building 24picture: an all-in-one AI image toolkit for creators

I built an AI email rewriter — here's how it works and what I learned

Launched OohSleep — a free AI sleep tracker PWA

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