卡卡局域网文件快传
kaka770.cn/tools/file-transfer →LAN file transfer that never touches a server
WHAT IT SOLVES
Sharing a big file with someone on the same network usually means uploading to the cloud first — slow, compressed, and your data passes through someone else's hands
WHY IT'S INTERESTING
Peer-to-peer via WebRTC, zero server relay
Create a room, scan a QR code, transfer directly. No file size limit because the data never touches the server — it goes straight from device A to device B over your local network
Usage logs suggest people keep coming back
The page lists dozens of transfer records going back to late July — this isn't a demo, someone is actually using this tool day-to-day
「Vibe-coded a web-based LAN file transfer tool」
TECH GUESS
WebRTC for P2P data transfer, a frontend framework for the UI, and a lightweight backend that only handles signaling
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