Upscayl is a FOSS desktop application that upscales low-resolution images locally using Real-ESRGAN models. It wraps a C++ Vulkan engine in an Electron frontend, processing files entirely on your own hardware rather than routing them through a cloud API. Packages are provided for Linux, macOS, and Windows.
It is worth keeping around if you need to bulk-enhance graphics or UI assets locally without paying per-image subscription fees. The main catch is hardware dependency: it requires a dedicated Vulkan-compatible GPU, and integrated graphics chips often fail to run the models.
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