AlterSend

Free plan AndroidiPhoneLinuxMacSelf-hostedWeb+1

What AlterSend is

AlterSend is an open-source peer-to-peer app for sending text notes, individual files, and folders to devices or recipients through a link. Transfers use end-to-end encryption, and the maker describes file transfers up to 200 GB. Devices can pair with a QR code or short code and be recognized for later transfers. Interrupted transfers resume after devices reconnect. Browser recipients can download without installing the app or creating an account; those links use a relay and are capped at 10 GB. The free service keeps direct transfers unlimited, while relayed app transfers are capped at 20 GB. AlterSend runs on Android, iOS, Linux, macOS, Windows, and the web, with desktop and self-hosted options. Self-hosting uses a Docker relay. The maker says files are not stored on its servers. Peer discovery briefly exposes a device IP address to DHT participants. The software is released under Apache 2.0.

Who it suits

It suits people sending notes, files, or folders across devices who want encrypted peer-to-peer transfers, browser links, or self-hosting. It also offers plans for personal and commercial relay use.

What it does well

End-to-end encrypted transfers
Direct transfers are unlimited on free plan
Transfers can resume after reconnection
Supports Android, iOS, desktop, web, and self-hosting
Apache 2.0 open-source license

What to know first

Free relayed app transfers capped at 20 GB
Browser links capped at 10 GB
Peer discovery briefly exposes device IP addresses
Business self-hosted relay costs $390 a year

Limits

The Free AlterSend plan allows unlimited direct transfers, but relayed app transfers are capped at 20 GB and browser links at 10 GB. The Personal self-hosted plan permits one relay server and four simultaneous transfers; the Business plan removes the simultaneous-transfer limit.

Plans

Plan	Billed and limits	Price
Personal self-hosted relay	Free forever · Personal, non-commercial use · one relay server · 4 simultaneous transfers · Discord community support	Free
Business self-hosted relay	Billed yearly per organization · Multiple relay servers managed from one place · unlimited simultaneous transfers · exportable usage metrics · commercial use license · priority support	$390 a year
Free AlterSend	Free to use · direct transfers unlimited · relayed app transfers capped at 20 GB · browser link transfers capped at 10 GB	Free
AlterSend Pro	Automatically renews monthly; exact price and currency shown in the app before purchase · Raises size limits on relayed transfers · priority when a relay is busy · direct transfers remain unlimited	On request
AlterSend Pro	Automatically renews yearly; exact price and currency shown in the app before purchase · Raises size limits on relayed transfers · priority when a relay is busy · direct transfers remain unlimited	On request

As altersend.com lists them, read 11 Oct 2026. The maker's own page has the final word.

Getting started

Open AlterSend on Android, iOS, Linux, macOS, Windows, or the web
Pair devices with a QR code or short code
Send a text note, file, folder, or browser link
For self-hosting, run the relay in Docker with one UDP port open
Choose the free plan or subscribe to AlterSend Pro in the app

Verdict

AlterSend combines broad platform support, encrypted peer transfers, resumable sending, and self-hosting. Relay limits and brief IP visibility during peer discovery are the main constraints to weigh.

Questions

Is AlterSend free?

Yes. Free AlterSend costs nothing, and the Personal self-hosted relay is also free.

Which platforms are supported?

AlterSend is available on Android, iOS, Linux, macOS, Windows, self-hosted servers, and the web.

Do browser recipients need an account?

No. Browser-link recipients can download without installing the app or creating an account.

What are the self-hosted plan prices?

Personal self-hosted relay is free. Business self-hosted relay costs $390 a year, billed yearly per organization.

Is AlterSend open source?

Yes. The maker states that it is released under the Apache 2.0 license.

Who operates AlterSend?

AlterSend is operated by Devaprime LLC.

Facts from AlterSend's own pages

Browser links: Recipients can download from a browser without installing the app or creating an account; browser link transfers use a relay and are capped at 10 GB. · altersend.com, 11 Oct 2026
Company: The privacy policy and terms identify AlterSend as a product operated by Devaprime LLC. · altersend.com, 11 Oct 2026
Desktop app: Yes · altersend.com, 21 Sept 2026
Diagnostics: Crash reporting is disabled by default and can be enabled by the user; enabled reports are sent to Sentry. · altersend.com, 11 Oct 2026
Encryption: The privacy policy says transfers use the Noise protocol with Curve25519 key exchange and ChaCha20-Poly1305 encryption. · altersend.com, 11 Oct 2026
Free plan: Yes · altersend.com, 21 Sept 2026
Integrations: The privacy policy names Sentry for crash reporting, Hyperswarm DHT for peer discovery, Stripe for card payments, Apple and Google for app purchases, RevenueCat for receipt validation, and Cloudflare and Supabase for subscription services. · altersend.com, 11 Oct 2026
Open-source license: The maker states that AlterSend is released under the Apache 2.0 license. · altersend.com, 11 Oct 2026
Pairing: Devices can be paired with a QR code or short code and recognized automatically for later transfers. · altersend.com, 11 Oct 2026
Peer discovery: AlterSend uses the Hyperswarm distributed hash table for device discovery, during which a device IP address is briefly visible to DHT participants. · altersend.com, 11 Oct 2026
Privacy: The maker says files are not stored on its servers and remain end-to-end encrypted when routed through its relay. · altersend.com, 11 Oct 2026
Product: AlterSend is an open-source peer-to-peer app for sending files end-to-end encrypted to devices or recipients using a link. · altersend.com, 11 Oct 2026
Resume support: Interrupted transfers can resume from where they stopped after the devices reconnect. · altersend.com, 11 Oct 2026
Self-hosting: Users can run the relay in a Docker container on a server with one UDP port open; the maker says no domain, certificates, or reverse proxy are required. · altersend.com, 11 Oct 2026
Support: The self-hosted Personal plan includes community support on Discord, while the Business plan includes priority support. · altersend.com, 11 Oct 2026
Transfer types: The app can send text notes, individual files, and folders, and its site describes transfers involving files up to 200 GB. · altersend.com, 11 Oct 2026

Where AlterSend stands on Freedom251

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