I'm the developer. DeviceShelf scans your LAN and tells you what each device is: vendor, type, open ports, and a per-device security report. It runs on macOS, Windows, Linux, iOS and Android, and there's a headless server edition (Docker + .deb) for 24/7 monitoring with ntfy, Gotify or webhook alerts.
It's local-first: nothing about your network leaves your machine unless you turn on an opt-in feature, there's no account, and the AI device ID uses your own API key. One-time purchase, with a trial.
It's still a young project, so bug reports and feedback are very welcome. If something looks off on your network, tell me and I'll fix it. Happy to answer questions too.