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Upscayl
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#1 free open-source AI image upscaler. Runs locally on Windows, macOS, Linux — no uploads, no watermarks, up to 16x resolution. Cloud plan also available.
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Stability AI
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Open-source AI image generator behind Stable Diffusion. Self-host free on 8GB GPU or use REST API. Inpainting, upscaling, LoRA fine-tuning. 350M+ downloads.
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