Lightweight offline image moderation using perceptual hashing and BK-Trees (TS/Rust/C)

We wanted a simple way to detect duplicate or modified images on low-end hardware without deploying heavy AI models or GPUs, so we wrote BKGuard. It is an offline library implemented in TypeScript, Rust, and C that uses dHash and pHash for similarity, ORB for keypoint matching to catch rotations or crops, and BK-Trees for lookups.

To keep expectations clear, this is not an AI model, a cloud service, or a database. It is just a lightweight CPU-only utility library that runs locally. Links to the code repositories are below if you want to use it or contribute.

You can ask anything you're curious about.

https://github.com/bkguard