WattFlow shows the real watts flowing into or out of your phone's battery, wired or wireless, via Android's BatteryManager API. Live wattage, peak tracking, a 60s graph, a charging benchmark, and home screen widgets — with tablet/landscape support. No ads, no analytics. Base app is free on Play Store; $2.99 IAP unlocks background history, energy ledger, sleep drain, and battery health tracking. Comfortable sideloading it yourself? Same features, free and open source on GitHub.