I'm a digital tutor at a middle school in Korea. A while ago I got tired of emailing myself files just to move a photo from my phone to a classroom PC, so I built a small web app with Claude Code: Clipboard Share . Open it on two devices on the same Wi-Fi and they find each other. No code to type, no sign-up, no app install. Building it was the fun part. Getting anyone to use it was not. Usage had been sliding for three weeks, and every "growth" task (checking Search Console, tweaking a titl...