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AlterSendWormhole File Transfer
Free

The client is open source under Apache-2.0; no paid tier is mentioned on the homepage.

 Free

Free and open source under the GPL-3.0-or-later.

Windows, macOS, Linux, Android, iOS, Web Android
  • Files go device to device with no copy left on a server
  • Recipients can download from a browser link without installing anything
  • No file size limit stated
  • Pairing by QR code or passphrase
  • Both devices must be online at the same time for a direct transfer
  • Transfer speed depends on the sender's own connection
  • Little documentation in the available research
  • Android only in the listed source
Downloadable app, Web application Downloadable app
Open source Open source
License: Apache-2.0 License: GPL-3.0-or-later
No account needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked October 2, 2026

Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.