📰 Dev.to · Zihang Dong 董子航

Articles from Dev.to · Zihang Dong 董子航 · 5 articles · Updated every 3 hours · View all reads

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Building a Browser-Based Keyboard Tester with Vanilla JavaScript

Dev.to · Zihang Dong 董子航 4d ago

Building a Browser-Based Keyboard Tester with Vanilla JavaScript

Have you ever bought a new mechanical keyboard only to discover a dead switch two weeks later — past...

I Analyzed 1,000 Professional Emails — Here Are the 5 Patterns That Get Replies

Dev.to · Zihang Dong 董子航 6d ago

I Analyzed 1,000 Professional Emails — Here Are the 5 Patterns That Get Replies

Last year I built RewriteEmail, a free AI tool that rewrites professional emails. After processing...

How I Built a Free QR Code Generator That Runs 100% in Your Browser

Dev.to · Zihang Dong 董子航 6d ago

How I Built a Free QR Code Generator That Runs 100% in Your Browser

Last month I launched ToolKnit — a collection of 31 free browser-based tools. One of the latest...

I Built 30+ Free Browser Tools in One Month — Here's What I Learned

Dev.to · Zihang Dong 董子航 1w ago

I Built 30+ Free Browser Tools in One Month — Here's What I Learned

The Frustration That Started It All It was a late night in March 2026. I needed to...

I Built a Free AI Sleep Tracker as a PWA — No App Store Needed

Dev.to · Zihang Dong 董子航 2w ago

I Built a Free AI Sleep Tracker as a PWA — No App Store Needed

The Problem Most sleep tracking apps cost $30-60/year, require app store downloads, and...