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Fast. Private. Together. — Send it. It's there.
Engineered by Thisma Labs.
Beside is a local-first peer sharing app for Windows 10/11 and Android 8.0+. Built with a native Rust core (rustls + ring) and Flutter UI, transfers stay strictly inside your local Wi-Fi at wire speed. Zero cloud, zero accounts, zero tracking.
Key Features & Specifications:
- Mutual TLS 1.3: End-to-end encrypted with pinned SPKI SHA-256 device keys.
- 8-Digit SAS: RFC 8446 TLS Exporter pairing prevents Wi-Fi MITM attacks.
- Hardware Keystore: Private keys encrypted in Windows DPAPI & Android Keystore.
- Bounded 64 KB RAM: Stream multi-GB files with per-file SHA-256 verification.
- OS Integration: System tray, Explorer "Send with Beside", and Android Share Sheet.
- Free vs Pro: Free tier included; Pro unlocks unlimited sizes, folders, & Auto-Accept.
Features
- Direct Local Wi-Fi Streaming: Wire-speed Gigabit transfers with zero cloud servers, zero relays, and no internet access required.
- Mutual TLS 1.3 Encryption: End-to-end encrypted with pinned X.509 SPKI SHA-256 device key fingerprints.
- 8-Digit SAS Pairing: RFC 8446 / RFC 5705 TLS Exporter commitment exchange prevents Man-in-the-Middle attacks.
- Hardware Keystore at Rest: Identity keys encrypted via Windows DPAPI and Android Keystore AES-256-GCM.
- Windows Desktop Integration: Win32 system tray, Start with Windows, Explorer context menu ("Send with Beside"), and WinRT toasts.
- Android System Integration: System Share Sheet target, MediaScanner gallery indexing, and persistent transfer service.
- Bounded 64 KB RAM Streaming: Ultra-low bounded memory footprint with per-file SHA-256 integrity verification.
- Non-Destructive File Saving: Automatically renames duplicate files to prevent overwriting.
Project Samples
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User Reviews
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This is great project! I really like the focus on privacy, fast file transfers, and security without relying on cloud services. The Windows and Android integration is also a big plus. Overall, a promising project with great potential!Reply from BesidePosted 2026-10-24
Thank you so much for the support and encouraging feedback! 😊 I'm glad you appreciate Beside's focus on privacy, fast local transfers, and security. My goal is to make sharing files and messages between Windows and Android as simple, fast, and private as possible, without depending on cloud services. Beside is still in its early stages, and there's a lot more to come. Thanks for being part of the journey! — Thisma Labs -
perfect app An Amazing App for Fast File and Message Sharing! Beside is one of the best apps I’ve used for sharing files and messages locally. Everything is incredibly fast, smooth, and easy to use. I love how simple it makes sharing files and messages without any hassle. The Pro version is also very reasonably priced and offers excellent value for money. Huge respect to the developer for creating such a useful and well-designed app! Keep up the great work and continue bringing us more updates. Highly recommended! 🚀👏Reply from BesidePosted 2026-10-24
Thank you so much for your kind words and for supporting Beside! ❤️ I'm really glad you're enjoying the speed, simplicity, and design. Your feedback means a lot, especially as Beside is just getting started. I'll continue working hard to improve the app and bring you more useful features and updates. Thanks again for being part of the Beside journey! — Thisma Labs
