Lewis: AI OBD2 Car Scanner

Check Engine Light Diagnostics

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

Lewis connects to your car through any supported Bluetooth OBD2 adapter and tells you exactly what's going on under the hood: in plain English, not confusing codes. SCAN YOUR CHECK ENGINE LIGHT IN SECONDS Plug in your OBD2 adapter, tap Scan, and Lewis reads every diagnostic trouble code your car is throwing. No more guessing what P0301 means or whether it's safe to keep driving. Lewis breaks it down: what's wrong, how serious it is, and what to do about it. AI-POWERED DIAGNOSTICS Lewis doesn't just read codes — he understands them. Using advanced AI, Lewis analyzes your scan results in the context of your specific vehicle, past scans, and known patterns to give you a clear picture of your car's health. Get severity ratings, likely causes, and recommended next steps. ASK LEWIS ANYTHING Got a weird noise? Dashboard light you've never seen? Just ask. Lewis is a conversational AI mechanic who knows your car — its make, model, mileage, and full scan history. Ask follow-up questions, get maintenance advice, or figure out if that repair quote from the shop is fair. LIVE ENGINE DATA Monitor real-time data from your engine while you drive: RPM, coolant temperature, throttle position, boost pressure, engine load, and more. Extended data available for select vehicles including oil temperature, oil pressure, transmission temp, and torque. TRACK YOUR CAR'S HEALTH OVER TIME Every scan is saved automatically. Review your history, track recurring issues, and catch problems before they become expensive. Lewis analyzes trends across all your scans to spot patterns a single visit to the mechanic would miss. WORKS WITH YOUR CAR Lewis works with any 1996 or newer vehicle (OBD-II compliant) and connects via any standard Bluetooth OBD2 adapter. Extended diagnostics available for Alfa Romeo, BMW, Audi, and Mercedes with more makes coming soon. WHAT'S FREE • Full OBD2 scanning and code reading • DTC descriptions with severity ratings • Live engine data monitoring • Scan history LEWIS PRO • Unlimited AI scan analyses • Ask Lewis anything — full AI chat • Trend analysis across all your scans • Manage multiple vehicles • Extended vehicle readings Privacy Policy: https://www.thelewisapp.com/privacy Terms of Service: https://www.thelewisapp.com/terms

Ratings & Reviews

  • 5.0
    out of 5
    2 Ratings

Improved onboarding experience.

Version 1.1.2

The developer, Kunolu Applications, 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 Linked to You

    The following data may be collected and linked to your identity:

    • Purchases
    • Contact Info
    • User Content
    • Identifiers
    • Diagnostics
    • Other Data

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • User Content

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
  • Kunolu Applications Inc
Size
  • 77.8 MB
Category
  • Utilities
Compatibility
Requires iOS 13.0 or later.
  • iPhone
    Requires iOS 13.0 or later.
  • iPod touch
    Requires iOS 13.0 or later.
  • Mac
    Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
  • English
Age Rating
4+
In-App Purchases
Yes
Copyright
  • © Kunolu Applications Inc.
  • Privacy Policy

    • More by Kunolu Applications