Stop guessing.
Start measuring.
The ultimate battery testing and diagnostic tool for your iPhone and iPad. Get precise charging information, historical charts, and online comparisons.
Everything you need to know
about your battery.
Amperes 4 provides a comprehensive suite of tools to diagnose, monitor, and optimize your device's charging performance.
Enhanced Precision
Get highly accurate readings of your charging current and voltage to test different cables and chargers.
Charts & History
Visualize your charging data over time with detailed charts and export historical tests for analysis.
Online Comparison
Submit your test results online and compare your device's performance with other users globally.
Deep Customization
Customize battery capacity for precise calculations if your battery was replaced or degraded.
Fast Charge Detection
Automatically detect and measure quick chargers to ensure you're getting the maximum charging speed.
Loved by users.
Great Tool!
"I got a new iPhone 15, and am using this app to establish baseline measurements with a battery at 100% life. I got this app to let me test and diagnose the devices... This app is giving me good information to compare with several years from now when this iPhone ages. It's a keeper!"
Great support from developer
"The app does exactly what it says it does. It's incredibly useful for testing which of my cables and charging bricks are actually delivering the power they claim to. The new charts feature in version 4.0 is fantastic for seeing the charging curve over time."
Ready to test your battery?
Join thousands of users who trust Amperes 4 to monitor, diagnose, and optimize their device's charging performance.
Get Amperes 4 for $2.99