MockMini is a native Swift proxy core for macOS, meant as a lightweight sing-box alternative that stays small enough to audit end to end (~2,600 lines). It speaks Shadowsocks (AEAD), VMess, Trojan and VLESS over TCP/WS/TLS, ships as a Swift package, and is open source under Apache-2.0. It powers the native VPN in the WLSA Plus macOS client.