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Real-ESRGAN ncnn Vulkan vs Upscayl: catalog facts
Real-ESRGAN ncnn Vulkan	Upscayl
Free Free and open source under the MIT licence.	Free Free and open source under the AGPL. There is no paid tier and no per-image cost.
Windows, Command line	Windows, macOS, Linux
Runs locally on Vulkan-capable GPUs No Python environment needed	Runs entirely on your own machine, so no images are uploaded anywhere Batch processing for whole folders
Command line only Repository has seen little activity since 2024	Needs a Vulkan-compatible GPU; the project warns many integrated chips will not work Slow on weaker hardware, and memory-hungry on large images
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: AGPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 21, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.