Truespar Tether
High-performance remote desktop built in Rust. Hardware-accelerated HEVC encoding, QUIC transport, and sub-frame latency input - with a zero-install web viewer for any browser.
Sub-Frame Latency
Input events are forwarded and replayed within the same frame they arrive. DXGI Desktop Duplication captures the screen at the compositor level - no polling, no encoding queue. You feel the remote machine, not the network.
Hardware Encoding
NVENC, AMD AMF, and Intel QSV - Tether uses the GPU's dedicated encoding silicon. HEVC at high quality without touching the CPU. The GPU encodes while the application renders.
Works Anywhere
QUIC transport handles NAT traversal and unreliable networks. The proxy relay connects machines behind firewalls. The web viewer runs in any browser - no plugin, no install, no client software.
How It Works
DXGI Capture
Desktop Duplication API captures frames directly from the Windows compositor. No GDI, no BitBlt, no window enumeration. The compositor hands Tether the finished frame as a GPU texture.
HEVC over QUIC
H.265 encoding delivers 2x the quality per bit compared to H.264. QUIC transport handles packet loss without head-of-line blocking - degradation is graceful, not a freeze.
Proxy Relay
For machines behind NAT or corporate firewalls, the Tether relay proxies traffic through a public endpoint. Backend-managed registration, session tokens, and audit trail via truespar-core.
Virtual Display Driver
IddCx 1.10 virtual display driver creates headless monitors - no physical display required. HDR support, arbitrary resolutions, and seamless monitor switching between physical and virtual outputs.
Web Viewer
Vue 3 SPA with WebGL rendering and WebCodecs hardware decoding. H.264 and H.265 decoded on the client GPU. LZ4 tile decompression via WASM. OTP and magic-link authentication - open a link, connect to your machine.
D3D11 Rendering
The native client renders decoded frames directly via Direct3D 11 - no CPU blit, no intermediate copies. OS-native cursor shapes are composited at the render level for pixel-perfect accuracy.
How Tether Compares
| Tether | RDP | Parsec | |
|---|---|---|---|
| Capture & Encoding | |||
| Capture method | DXGI Duplication | GDI / Mirror | DXGI Duplication |
| Codec | HEVC (H.265) | RDP codec | H.265 |
| Hardware encoding | NVENC/AMF/QSV | Software | NVENC/AMF/QSV |
| Transport | |||
| Protocol | QUIC | TCP/UDP | Proprietary |
| NAT traversal | Proxy relay | Port forward | Cloud relay |
| Access | |||
| Web viewer | Built-in | - | - |
| Virtual display | IddCx 1.10 | - | Virtual display |
| Self-hosted | Full control | Windows built-in | SaaS only |
Access Your Machine From Anywhere
Open a link in your browser. Your desktop is there - full resolution, full speed, no install.