Anime4K vs NextGenUp

Anime4K is a free, open-source collection of algorithms for real-time anime upscaling and denoising. The algorithms are intended for watching enlarged anime while it plays and can be implemented in any programming language. Anime4K is optimized for native 1080p anime encoded with H.264, H.265, or VC-1, with a listed maximum output resolution of 4K. Its described processing includes line-art CNN upscaling, line-art deblurring, denoising, resampling-artifact reduction, and experimental line darkening and thinning. It is desktop software for Windows, macOS, and Linux. Installation instructions link GLSL configurations for mpv and Plex on Windows and Linux, and for mpv, IINA, and Plex on Mac. The project does not target anime reduced to 720p, 480p, or standard definition, and artifacts in older material may be difficult to remove. The project says SRGANs perform better on low-resolution or heavily degraded images, but they do not run in real time. Anime4K was founded in 2019 and is maintained by bloc97.

NextGenUp is a free tool for enlarging images and video, available as desktop software for macOS, Windows 10/11 and Linux, or as a self-hosted web app. Processing runs on the user's hardware: its models, FFmpeg and server run locally, and files are not sent to cloud processing. Images can be enlarged to 8K using Quick, Quality, Enhance or Ultra modes; video upscaling reaches 4K through basic and professional AI modes. Enhance reduces noise and blur without enlarging the image, while GFPGAN v1.4 detects faces and restores detail. Real-ESRGAN handles super-resolution. Processing uses the CPU by default and accelerates with a GPU when available. The browser app can use WebGPU on Chrome or Edge 113 and later. The software is MIT licensed and needs no subscription, watermark or account. There is no trial limit. Web files are limited to 2 GB, and older processed files are automatically removed after 24 hours. PNG is the listed output format.