WattCheck: Cable Tester
Test charging and cables
About
This app helps you test and compare your charging cables and power adapters. It estimates charging performance over time, allowing you to rank your cables and identify the best and weakest charging gear. Clean up your cable drawer and stop guessing which cable is slowing you down.
What's New in WattCheck
3.0
September 30, 2026
WattCheck 3.0 — our biggest update yet! • All-new design: a live charging gauge, smooth animations and a cleaner test screen • Try it free: run a Quick 5-minute test without a subscription • Share your result as a beautiful card • New Premium options, including a one-time Lifetime purchase: no subscription needed • Redesigned PDF reports with a battery chart and clear, easy-to-read sections • Full-width iPad layout • Smarter verdicts that take your adapter's rated power into account • Improved translations in all 45 languages • Bug fixes and performance improvements
MoreSubscriptions & In-App Purchases
WattCheck Premium Monthly
WattCheck Premium Monthly unlimited charging tests
Developer apps
FAQ
How does WattCheck estimate charging performance?
WattCheck uses public iOS battery information to estimate charging performance based on battery level changes over time. It does not require special hardware or private system APIs, providing real-world estimates for everyday conditions.
What are the benefits of WattCheck Premium?
WattCheck Premium unlocks unlimited charging tests, full history access, cable ranking, detailed charts, charger comparison features, and CSV export functionality. This allows for more in-depth analysis and management of your charging gear.
How accurate are the charging speed estimates?
The app provides quick feedback after 5 minutes, better accuracy after 10 minutes, and stronger comparison data after 20 minutes. For best results, it's recommended to test between 20% and 70% battery and keep the device temperature normal.
Can WattCheck read USB voltage and current data?
No, WattCheck does not directly read USB voltage, current, or USB Power Delivery data. iOS does not provide this information to regular App Store apps. The app focuses on estimating real-world charging performance through battery level changes.
What are the subscription options for WattCheck Premium?
WattCheck Premium offers weekly ($1.99/P7D), monthly ($5.99/P1M), and yearly ($29.99/P1Y) subscription plans. Payment is charged to your App Store Account upon purchase confirmation, and subscriptions auto-renew.
Does WattCheck have ads?
No, WattCheck is ad-free. The application does not display advertisements, ensuring an uninterrupted user experience.
What devices is WattCheck compatible with?
WattCheck is designed for iPhone and iPad devices. It utilizes device profiles to select the correct battery capacity for more accurate charging estimates.
How often is WattCheck updated?
The latest version of WattCheck is 3.0, last updated on 2026-09-30. Updates typically include performance improvements and new features based on user feedback and iOS advancements.
