AlterSend

AlterSend is a peer-to-peer file transfer app that sends files directly between devices without cloud storage, with native apps and no account required.

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Private file transfer between devices

AlterSend is a peer-to-peer file transfer app for sending files directly between devices without cloud storage. It is built around private transfers: the site says files move device-to-device, end-to-end encrypted, with no accounts required.

The product is positioned for people who want a shared transfer flow across macOS, Windows, Linux, iOS, and Android. You pair devices once with a QR code or join code, then future transfers between those devices can proceed without repeating the pairing step.

Features

Direct device-to-device transfer

AlterSend sends files directly between devices using a peer-to-peer connection rather than uploading them to a cloud service.

End-to-end encryption

Transfers are end-to-end encrypted, and the site specifies ChaCha20-Poly1305 with new encryption keys per session.

Pairing without accounts

There is no account creation or sign-up flow; pairing is done with a QR code or join code.

One-time device pairing

Paired devices are remembered, so future transfers between the same devices can skip the code step.

No file size cap

The product says it has no size limits, with the same transfer flow for small files and very large ones.

Cross-platform native apps

Native apps are available for macOS, Windows, Linux, iOS, and Android, using one shared protocol across platforms.

Use cases

Personal device-to-device transfers
Send documents, photos, and other files between your own devices without creating accounts or uploading them to a third-party storage service.
Cross-platform sharing
Move files between a Mac, Windows PC, Linux machine, iPhone, or Android device using one shared app family and protocol.
Large-file transfers
Transfer large files without worrying about a stated size limit, since the site says there are no caps.
Repeat transfers between trusted devices
Set up a device once and reuse the pairing later when you regularly send files between the same two devices.

Pros and Cons

Pros

Transfers are peer-to-peer and do not go through cloud storage.
End-to-end encryption is described with a specific cipher and per-session keys.
No account is required, which reduces setup and shared credential handling.
Paired devices can be remembered to reduce repeated setup.
Native apps are offered for the major desktop and mobile platforms.

Cons

The pricing page returns a 404, so the site does not currently provide a separate pricing breakdown.
The source material does not document integrations, protocol compatibility, or admin/team features beyond direct device transfer.

FAQ

Do I need an account to use AlterSend?

No. The site says AlterSend pairs devices without accounts or sign-up.

Do I have to pair every time?

No. Once you pair devices you own, they are remembered and future transfers can skip the join code.

Does AlterSend work over the internet?

Yes. The homepage says AlterSend sends files straight between devices over a peer-to-peer network, including transfers that work over the internet.

Can I trust my files aren't stored in the cloud?

The site says files travel device-to-device, end-to-end encrypted, and never touch cloud storage.

Is AlterSend free and what platforms does it support?

The product is described as free and open source, with native apps for macOS, Windows, Linux, iOS, and Android.

Quick Facts

Category: File Transfer
Platforms: macOS, Windows, Linux, iOS, Android
Deployment model: Peer-to-peer, direct device transfer
Security: End-to-end encrypted; ChaCha20-Poly1305
Pricing: Free; pricing page currently returns 404
Source domain: altersend.com

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