Video Upscalers & Line Doublers

Video upscalers and line doublers are both devices (hardware or software) used to increase the resolution of a video signal, primarily to make older, lower-resolution content compatible with or look better on modern high-definition (HD) or 4K displays. The key difference lies in their methodology and the quality of the resulting image.

RetroTINK (Mike Chi)

RetroTINK-4K ($750)
RetroTINK-5X Pro ($325)
RetroTINK-2X series (various models)
Website: retrotink.com

Open Source Scan Converter (OSSC)

OSSC Pro ($200-250)
OSSC Classic
Community-developed, open-source
Available from Video Game Perfection

Micomsoft (Japan)

XRGB-mini Framemeister (discontinued but legendary)
XRGB series

PixelFX

Morph 4K
Website: pixelfx.co

HD Retrovision

RAD2x cables (RetroTINK-based)
Component cables
Website: hdretrovision.com