Deckard is a Rust program for finding duplicate images. It recursively walks a file system, computing a perceptual hash of each image it finds, and displaying sets of images with the same hash. Using a perceptual hash allows it to find matching images even after being resized or lightly modified.
You can use cargo build [--release] to build a bare binary.
On Mac OS, build_macos.sh runs cargo build, then /scripts/make-app.sh, which builds Deckard.app (in target/{BUILD_MODE}/Deckard.app).
Deckard also supports being bundled in to an app on multiple platforms with cargo-bundle; the app will be built in target/{BUILD_MODE}/bundle/{PLATFORM}/.