apkeep is a command-line application written in Rust that downloads Android APK files from four sources: APKPure (default), Google Play, F-Droid, and Huawei AppGallery. The binary accepts individual app IDs or CSV lists, supports specifying versions, listing available versions, parallel fetches, sleep throttling, and per-source options. For Google Play, it supports AAS or AUTH token authentication, device profiles, locale/timezone overrides, split APK and OBB expansion file downloads. For F-Droid, it downloads and cryptographically verifies the signed repository index (both legacy index-v1.jar and the newer entry.jar) before selecting APKs, checking certificate fingerprints and digest chains.