A pocket-sized super-resolution lab for Android

What it does RealSR-NCNN-Android is a frontend and CLI wrapper that bundles multiple neural-network upscalers—RealSR, Real-ESRGAN, RealCUGAN, SRMD, Waifu2x, plus Anime4KCPP and classical interpolators like Lanczos and AVIR—into one Android app. It runs entirely on-device via NCNN and, since v1.11, also supports MNN models. The GUI is essentially a shell around command-line binaries; power users can drop into a terminal or feed it raw shell commands.

The interesting bit The project is less a new engine than a meticulous integration: it repackages Nihui’s NCNN ports, adds MNN support for broader model compatibility, and provides a path to convert PyTorch ESRGAN models (via Cupscale or chaiNNer) into something your phone can run. The author is admirably frank that “most of the C code is copied from Nihui” and that the original git history got mangled during directory restructuring.

Key highlights

• Supports NCNN and MNN inference backends; MNN opens the door to ONNX, TFLite, and TorchScript models
• Ships with pre-converted Real-ESRGAN, RealCUGAN, and Waifu2x models; custom models load from SD card
• Includes ImageMagick-powered resize/convert tools and classical interpolation as fallbacks
• CLI variant works in Termux; GUI variant accepts images via Android share sheet
• No network access required, no data collection claimed

Caveats

• Batch processing is awkward: multi-select only works via external share, and results save straight to gallery without preview
• GIF handling is limited to single-file mode, with no preview and no ImageMagick support
• The GUI is described by its own author as “very simple” with no plans for polish
• Converting your own models requires Windows tools (Cupscale or chaiNNer) and careful filename conventions

Verdict Worth a look if you want offline upscaling on Android without paying for a commercial app or uploading photos to a server. Skip it if you need polished batch workflows, GIF previews, or a slick native UI—this is a tinkerer’s toolkit, not a consumer product.