PowerVigil is a native Swift menu bar app that monitors your Mac and explains what's happening in plain language. 9 monitors track CPU, memory, battery, thermals, power draw (watts), temperatures, and processes. Instead of charts, you get tips like "Spotlight is indexing, that's why your fan is loud." Free: overview, battery info, 22 contextual tips. Pro: anomaly detection, watts tracking, usage profiling, battery health prediction, and 90-day history. 776 KB. Zero dependencies. No Electron.