Lemonscope: Used Car Check
Test drive inspection & VIN
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Buying a used car? Turn the test drive into evidence: brakes, shocks, idle and shifts measured, plus a free VIN recall check.
Buying a used car? Turn the test drive into evidence.
Lemonscope uses your iPhone's motion sensors during a normal test drive, adds a guided walk-around checklist and free U.S. government vehicle data, and gives you a clear verdict with talking points you can use to negotiate.
KNOW WHAT YOU'RE BUYING BEFORE YOU PAY
FREE VIN CHECK
- Scan the VIN barcode or type it in.
- Decoded by NHTSA: year, make, model, trim, engine and transmission.
- Recall campaigns and owner complaints for that model year, from NHTSA.
HANDS-FREE TEST-DRIVE MEASUREMENTS
Mount the phone, or let a passenger hold it, and drive a normal route. Lemonscope detects each test automatically and tells you by voice when it's captured:
- Idle vibration: engine shake and idle speed while parked.
- Suspension: how quickly the car stops bouncing after a bump (worn shocks keep bouncing).
- Brakes: firmest stop, pull to one side, and pulsation.
- Straight-line tracking: steering wander on straight roads.
- Acceleration and shifts: harsh shifts or slipping.
- Cabin noise (optional, microphone level only, no audio recorded).
GUIDED WALK-AROUND
Exterior, tires (penny test, DOT date code), under the hood, interior, electronics, and title and paperwork red flags, with plain-English tips and optional photos.
A REPORT YOU CAN PUT ON THE TABLE
- Verdict: Looks good, Ask questions, or Walk-away signals.
- 3 to 6 negotiation talking points with typical U.S. repair-cost ranges.
- A suggested offer range from the asking price.
- Share it as a PDF.
DRIVE SAFELY
Set up while parked. While the car is moving there is nothing to tap, and voice cues keep your eyes on the road. Lemonscope never asks you to speed or make unusual maneuvers.
INSPECTOR PRO: $9.99, ONE TIME
Your first full report is free. Inspector Pro unlocks unlimited reports, PDF export, the photo checklist and side-by-side comparison of several cars. VIN decoding, recalls and complaints stay free. It's a one-time purchase, not a subscription.
PRIVATE BY DESIGN
No account and no tracking. Sensor data, routes, photos and reports stay on your iPhone.
IMPORTANT: Lemonscope is an indicative screening based on phone sensors, your checklist answers and public NHTSA data. It is not a professional mechanical inspection and can miss problems. Consider an independent pre-purchase inspection before you buy. Not affiliated with NHTSA or any vehicle manufacturer.
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Anand Sengupta, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Anand Sengupta
- Size
- 2.2 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Inspector Pro $9.99
- Copyright
- © 2026 Anand Sengupta