| I built this because I kept exceeding my mobile data cap when tethering. The problem: macOS doesn't distinguish between home WiFi and iPhone hotspot. I'd finish a Zoom call thinking I was on home internet, only to discover I'd burned through 3GB of cellular data. Existing options didn't fit: - TripMode ($15/year) does app blocking - overkill for just monitoring - Bandwidth+ is free but treats all WiFi the same Technical approach: - NWPathMonitor.isExpensive detects tethering vs regular WiFi - CoreWLAN reads SSID for multi-hotspot profile support (requires Location permission on Sonoma+) - Pure system frameworks, no external dependencies Supports multiple profiles so you can track personal phone (15GB cap), work phone (unlimited), travel MiFi separately. $4.99 one-time. macOS 14+. Happy to answer questions about the implementation. |