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AirDrop-style cross-platform file transfer app with radar UI

by Movez (@0xMovez) · Oct 27, 2026

I just reverse-engineered Apple AirDrop with Opus 5.5 to send files between my Mac & Windows PC this is insane... drag a file onto the other computer → hop. it's there. no cloud. no account. no cable. → https://t.co/UXopfYsIWd here's the build step by step: • step 1 → open Claude Code on Opus 5.5 in an empty folder and paste the prompt below • step 2 → Opus picks the stack: one Electron codebase that runs on macOS and Windows • step 3 → discovery: every 1.5 s each computer says "i'm here" over UDP on your local network. the other one pops up on a radar • step 4 → transfer: files stream directly between the two machines. the other side gets Accept / Decline. "always accept" for your own computers • step 5 → before any UI, Opus wrote a test: two fake devices find each other and send a folder + a 3 MB file, byte for byte • step 6 → design: Opus split the work across parallel agents. one rebuilt the iOS 17 NameDrop glow as a WebGL shader, one drew 3 icon concepts and picked the best, one built the download site • step 7 → separate reviewer agents checked every piece. one caught a shader bug that would've rendered black on the Mac. i'm on Windows, i'd never have seen it • step 8 → GitHub Actions builds the .dmg and the .exe on every release. the Mac build runs on Apple hardware in the cloud, not on my PC • step 9 → first launch on the Mac: the icon just bounced in the dock. Opus added a startup log and a fallback that forces the window open. next build opened fine one afternoon. zero lines written by me. drop it on the Mac. it lands on the PC. that's it... find full prompt below ↓ Then read the article on how to reverse-engineer anything with Opus 5.5.
— Movez (@0xMovez) Oct 27, 2026

Prompt

The author shared the full prompt.

Build "Hop": an AirDrop-style app to send files between a Mac and a Windows PC on the same Wi-Fi. No cloud, no accounts.

Stack: Electron (one codebase for macOS + Windows), plain HTML/CSS/JS UI, no frameworks.

1. Discovery: each device broadcasts a small JSON beacon over UDP (port 47800) every 1.5 s to every subnet broadcast address. Show peers that were seen in the last 10 s. Ignore your own beacons.

2. Transfer: each device runs an HTTP server on a random port. Sender POSTs an offer (file names + sizes), the receiver shows Accept / Decline, then files stream one by one. Support whole folders. Never overwrite: "photo (1).jpg". Reject any path that could escape the download folder.

3. Trust: an "Always accept from this device" checkbox. Save to Downloads/Hop (changeable).

4. Before building any UI, write a Node test where two devices in one process find each other and send a folder + a 3 MB file; compare hashes.

5. UI, Apple-level polish: a radar with this device in the center and peers around it (Apple logo on Macs, Windows logo on PCs). Drag files onto a peer, or click it to pick files. The file chip flies along an arc into the peer, then an iOS 17 NameDrop-style iridescent light wave sweeps across the window (WebGL shader with a Canvas fallback). Progress ring around the peer. Vibrancy on macOS, acrylic on Windows 11. Light / Dark / Auto switch.

6. Icon: macOS squircle, 1024 px, readable at 16 px. Draw 3 concepts, compare them, keep the best.

7. Run independent review passes on the UI and the networking code before shipping.

8. GitHub Actions: on a v* tag build Hop-mac-arm64.dmg, Hop-mac-x64.dmg and Hop-windows-x64.exe and publish a release.

9. Add a startup log and always show the window, so a launch that hangs is easy to debug.

Ship it, then give me the install steps for both machines.

Prompt by @0xMovez, from their reply

Category: Apps & UI
Stack: Canvas, WebGL
Made with: Claude Code, Electron, WebGL, Canvas, GitHub Actions
From the author: One afternoon; zero lines written by author.
On X: 639 likes · 59K views · 689 saves

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