SweaxDrop

Windows · Android · iPhone · any browser

Your files,
on parallel lanes.

Photos, videos, folders and text between your PC and your phones, over your own Wi-Fi. Encrypted end to end, checked chunk by chunk, and it picks up where it stopped when the connection drops.

Download Try it here
  • 3 GB/s4 encrypted lanes, in memory on one PC
  • 4.8×faster than LocalSend 1.18 with 200 photos
  • TLS 1.3both sides proven by their key
Live demo · the real interface with a pretend network
Files, folders, photoskeep their folder structure, land in the gallery on phones
Text and clipboarda link from the phone, straight onto the PC clipboard
Queue, pause, resumelose Wi-Fi mid-way: only the missing chunks travel again
No app on the phone?scan the QR code, the browser becomes the app

Why it is fast

Most tools send one file per request and wait for an answer before the next one. With two thousand holiday photos, that waiting is most of the time.

SweaxDrop opens several encrypted lanes at once. Every lane takes the next 4 MiB chunk from one shared queue: a huge video is split across all of them, small files follow each other with no round trip, and a lane that stalls holds nobody up. Reading, hashing, encrypting and writing overlap on separate threads.

The lanes you see in the app are the real ones: each track moves as fast as its own connection moves bytes.

Sender threads read and hash chunks, four TLS lanes carry them, receiver threads verify and write them at their offsets.
Windows: drop files on a device, accept a phone's photos, look back at the speed.
Android and iPhone: the same app, the same lanes.

Measured, not promised

Every number on this page comes from sweaxdrop-bench in the repository, run on one PC (AMD Ryzen 5 7600, NVMe SSD, Windows 11) against the official LocalSend 1.18.2 command-line app, with the same files on the same drive. Below them, the first results with a real phone over Wi-Fi.

With a real phone, over Wi-Fi

Redmi Note 13 on a home router's Wi-Fi, the PC on Ethernet. One run each, average speed.
PC → phone · one 1 GiB file
26.4 MB/s · 40.7 s
PC → phone · 200 files, 723 MB
32.9 MB/s · 23.0 s
PC → phone · 1 000 small files
1.1 MB/s · 30.0 s
Phone → PC · 4 videos and a photo
40.5 MB/s · 6.25 s
The 1.0.0 app wrote small files slowly on the phone, about 30 ms each; 1.0.1 writes them directly, not yet measured on a phone.

Over Wi-Fi the radio is the limit for one big file. The differences that stay are in many small files, in the time to start, and in what happens when the connection drops.

Private by construction

  • Each device has its own Ed25519 key. Its id is derived from that key, so it cannot be borrowed.
  • Every transfer runs inside TLS 1.3 with both sides proving their key. Paired devices are pinned: a different key is refused.
  • Pairing by PIN uses SPAKE2 and checks both TLS keys, so someone relaying the connection cannot pair in your place.
  • Every 4 MiB chunk carries a BLAKE3 hash and is verified before it is written.
  • Nothing leaves your network: no account, no server, no telemetry.
One Rust core shared by the Windows, Android and iPhone apps and the browser client.

Get SweaxDrop

Windows 10 / 11Installer, about 5 MB. Asks once (UAC) to add its firewall rule. Android 10+APK from the release page. Allow installing from your browser when asked. iPhoneRight away: scan the QR code on your PC. Native app: sideload the .ipa (steps in the README).

Questions

Does it need internet?

No. Devices find each other on the local network and talk directly. A phone hotspot or USB tethering works too, and is often faster than going through a router.

Is it faster than LocalSend everywhere?

Not for one huge file over Wi-Fi: there both are limited by the radio. It is faster with many files, starts sooner, and resumes instead of starting over. The numbers above show exactly where.

What about the browser client?

It is plain HTTP on your network, protected by the one-time secret in the QR code, because browsers cannot accept the PC's self-signed certificate without a warning. The apps use the encrypted protocol.

Where do received files go?

Windows: Downloads\SweaxDrop or a folder you choose. Android: photos and videos to the gallery, the rest to Download/SweaxDrop. iPhone: Photos, and the Files app under SweaxDrop.