WattFlow: Real Battery Power

William WANG

In-app purchases

About this app

⚡ Your 100W charger might be charging at 8W — and you'd never know.

A worn cable, a dusty port, a misaligned wireless pad or a hot battery can silently cut your charging speed by 90%. Your phone still says "charging".
WattFlow shows you what's actually happening.

WattFlow is an honest, real-time meter for every watt that flows in or out of your battery.

REAL-TIME POWER, BOTH DIRECTIONS
• Live watts refreshed every second — charging in, draining out
• Wired (AC / USB / dock) and wireless, detected automatically
• Voltage, current, temperature and battery level at a glance
• Peak In / Peak Out tracking and a live 60-second power graph
• Animated charge flow — watch the current move

FIND THE PROBLEMS
• Compare chargers, cables and wireless pads in seconds
• Catch slow charging before you wake up to a 12% battery
• See how much power your screen and apps burn — while charging or on battery
• Watch the real drain when reverse-charging your earbuds or watch

WATTFLOW PRO — one-time purchase, yours forever
• Battery history: every charge session logged — duration, % gained, average and peak watts, energy in Wh
• 7-day energy chart and statistics
• Background recording with live watts in the notification

THE HONEST NUMBER
WattFlow shows battery-side power — what actually reaches (or leaves) your battery, not the marketing number on the charger brick. That's why it can read lower than the charger's own display: conversion losses and system drain are real, and knowing the difference is the whole point.

PRIVATE BY DESIGN
• Zero permissions, no ads, no analytics, no network access
• Everything stays on your device
• Open source: github.com/Shureby/wattflow
• Available in 12 languages

Requires Android 8.0 or newer. Battery readings come from your device's own sensors; a small number of devices report inaccurate values.

What’s new

Battery alerts, charge/discharge history with session curves, runtime estimate, home screen widget, CSV export, 12 languages.