AltSendme 0.4.1

AltSendme delivers private, cross-platform P2P file sharing with end-to-end encryption, multi-gigabit speeds, NAT traversal, and zero data exposure.

Razvan Serea News Reporter Neowin · Jun 27, 2026 10:00 EDT with 0 comments

AltSendme

AltSendme is a minimal, cross-platform application designed for fast, secure, and private peer-to-peer file transfers. It allows users to send files or entire directories directly between devices without relying on cloud servers, accounts, or any personal information. Everything is encrypted end-to-end using modern protocols like QUIC and TLS 1.3, ensuring both strong security and low-latency performance. Transfers are verified with BLAKE3 for data integrity, and interrupted downloads automatically resume, making the experience reliable even on unstable connections.

You can transfer anything—images, videos, documents, and more. Integrity checks are performed on both ends, so your files are automatically verified for correctness during both sending and receiving.

AltSendme works seamlessly across local networks or long-distance links, capable of saturating multi-gigabit connections for extremely fast delivery. With built-in NAT traversal and encrypted relay fallback, it connects devices almost anywhere. The app integrates with the Sendme CLI and will soon support mobile and web platforms.

Fully free and open-source, AltSendme offers a lightweight, privacy-first alternative to traditional cloud-based services, removing size limits, upload costs, and unnecessary data exposure.

AltSendme 0.4.1 changelog:

Release Highlights

Self-hosted relays: Run your own iroh relay so transfers don't rely on public infrastructure. Includes a full deployment template in deploy/relay/ with Docker Compose for a VPS and configuration examples for production use.
Fly.io support: One-click deploy template for Fly.io, including a quick-start config (fly.dev.toml) for testing without a custom domain, plus production setup with Let's Encrypt and your own hostname.
Relay settings UI: New Settings → Network panel to choose how AltSendme connects: automatic public relays, custom self-hosted URLs (with optional auth token), or disabled. Test connections, verify latency, and see live relay status in the footer.
Disable relays: Turn off relay servers entirely when you only need same-network transfers (e.g. LAN). Direct connections only. No relay hop required when devices can reach each other.
Android graduates from beta: Android is now part of the regular release cycle alongside desktop. APKs ship with each version (universal, arm64, and armv7).

Other improvements

Private relay access control via shared auth token
Relay fallback notifications when a custom relay is unreachable
Broadcast mode toggle in sharing settings
Android release build fixes (split-per-ABI APKs, universal APK preservation)
UI polish: mobile safe-area insets, dropzone layout, transfer progress animation
Bug fixes for minification-related serialization issues and system tray icon loading

What's Changed

feat(relay): add relay status functionality and settings UI (a120cdf)
feat(relay): implement custom relay server configuration and verification (51276c7)
feat(relay): add configuration for private relay access and enhance observability features (48fbabf)
feat(relay): enhance relay URL validation, display connection status (d4fffa0)
feat(relay): add RelayChangeGuard component and enhance relay-related translations (16ba514)
feat(broadcast): add toggle setting for broadcast mode in sharing UI (ca6d977)
fix(relay): correct QUIC discovery port, pin image, templatize fly.dev (52a2ba5)
fix: More broken serialization due to minification (67491a9)
fix(android): preserve true universal APK across per-ABI builds (e9f256f)
fix(ui): conditional safe-area insets padding on mobile (1182f0e)
refactor(transfer): CircularRing component animation fix (944572b)
chore(android): drop x86 and x86_64 release APKs, keep universal+arm64+armv7 (34ada0b)