FrontierStack is a macOS app for managing servers, services, and devices from one interface. Starting with read-only diagnostics, it requires explicit approval for changes. Credentials are stored locally, and sensitive data is redacted during operations. The AI Administrator answers infrastructure questions, runs diagnostics, and explains findings in plain language. Repair actions require user confirmation. It supports cloud providers like OpenAI and local models via Ollama, LM Studio, and Apple Foundation Models. Managing over 500 services, including SaaS and self-hosted solutions, it enables SSH-based operations across machines. Compatible with macOS, Windows, Linux, BSD, and legacy Apple hardware, it offers device discovery, database monitoring, RAID health tracking, and Power over Ethernet control. Security tools include macOS firewall management, ClamAV, YARA, and endpoint detection. A companion iOS app provides mobile fleet management with monitoring, alerts, and remote access.