Check a Used iPhone or Mac Before You Buy
Buying a second-hand Apple device? Don't rely on the seller's word. ProofCheck runs a complete hardware diagnostic — battery, display, cameras, sensors, storage, and more — and gives you an instant, honest A-F grade you can trust.
Why You Should Always Run a Diagnostic on a Used Device
Second-hand iPhone and Mac listings rarely tell the full story. A battery at 60% capacity, a display with hidden dead pixels, a microphone that cuts out on calls — these issues don't show up in photos and sellers often don't know (or don't say). When you're spending hundreds of dollars on a used device, a two-minute diagnostic check can save you from a costly mistake.
ProofCheck tests every hardware component that matters and produces a clear, letter-graded report. Sellers run it on their device before listing — buyers verify the report is genuine before paying. The result is a faster, fairer used device market where trust goes both ways.
Whether you're buying an iPhone on eBay, a MacBook on Facebook Marketplace, or a Vision Pro from a private seller, ProofCheck gives you the objective hardware data you need to buy with confidence — or walk away.
What the Diagnostic Covers
Battery Health
Maximum capacity, cycle count, and charging health. Know if the battery needs replacing before you buy.
Display & Touch
Dead pixel detection, touch responsiveness across the full screen, and brightness uniformity testing.
Cameras & Sensors
Front and rear cameras, autofocus, flash, microphones, speakers, and all motion and environmental sensors.
Storage & Connectivity
Available storage verification, read/write speed, Wi-Fi, Bluetooth, NFC, and cellular hardware status.
Biometrics
Face ID and Touch ID sensor health — checked without capturing any biometric data.
Tamper-Proof Report
Every report is cryptographically signed. Verify it's genuine at lorislab.fr/verify before you hand over any money.
Works on iPhone, Mac, and Vision Pro
ProofCheck supports all modern Apple devices. Run it on the device being sold — the app adapts its test suite to the hardware in hand, covering everything from Face ID iPhones to Apple Silicon MacBooks to Vision Pro headsets. One app covers the entire second-hand Apple ecosystem.
ProofCheck — Coming Soon
Free to run a diagnostic. Pro unlocks shareable tamper-proof reports for buyers and sellers.