About this app

Your AI car mechanic: diagnose issues, track maintenance, and know your car. Get plain-language answers about your specific vehicle, read your car's diagnostic codes, watch live engine data, track every service, and turn receipts into organized records with a scan. And when that check engine light does come on? Get a plain-language first read for your vehicle - what the code means, how urgent it looks, and what to check next. Confirm with a mechanic before you clear it. WHAT KAIJU MECHANIC DOES Connect a Bluetooth Low Energy (BLE) ELM327 OBD-II adapter and Kaiju Mechanic reads your car's diagnostic codes directly. No adapter? No problem - you can still use AI chat, log maintenance, scan documents, and manage your garage without any hardware. - AI mechanic chat. Ask anything about your car and get a real, vehicle-specific answer. Not generic advice. Kaiju Mechanic knows your make, model, year, and service history. Rough idle, strange noise, hard starts? Describe the symptom and the AI helps you narrow down likely causes. - Maintenance tracking. Log every oil change, brake job, and fluid flush, and see what is due next. Personalized AI schedules are a Premium feature. - Document scanning. Photograph your repair invoices and service receipts. AI reads them and automatically extracts the service date, mileage, and what was done. - Vehicle garage. Add multiple vehicles and switch between them instantly. Each vehicle keeps its own complete history. - Modification log. Track upgrades, aftermarket parts, and tuning changes alongside your factory service history. - Check engine light decoder. Connect an adapter and read the actual trouble codes. Already have a code like P0420 or P0301? Type it in - no adapter needed. The AI explains what each code means for your specific vehicle, how urgent it is, and what the typical repair involves. - Live sensor data. Real-time engine readings over OBD-II: RPM, coolant temperature, throttle position, oxygen sensors, battery voltage and more. - Tune and flash history. Your ECU's firmware signature is recorded on the first scan and any later change is flagged (adapter required; Premium). FREE - NO CATCH Every account starts free. No credit card. No trial period. - One vehicle in your garage - A monthly allotment of AI credits for chat, diagnostics, document scanning, and more - Full maintenance history logging with unlimited service records - OBD-II connectivity over Bluetooth LE for diagnostic code reading - Cloud storage, synced across devices - Registered users can buy extra AI credit packs anytime PREMIUM Optional subscription for DIY owners, enthusiasts, collectors, and multi-car households who want the full AI experience. Price and billing period are shown in the app before you buy. - A larger monthly allotment of AI credits - Unlimited vehicles - More cloud storage with backup and sync - Member pricing on extra AI credit packs - Premium forensic tools, including Mode 09 calibration checks and tune-history intelligence CONNECT YOUR OBD-II ADAPTER On iPhone, Kaiju Mechanic works with Bluetooth Low Energy (BLE) ELM327 adapters, widely available online and at auto parts stores. Plug into the OBD-II port under your dashboard, standard on virtually all vehicles built after 1996, and connect from inside the app. Bluetooth Classic (SPP) and Wi-Fi adapters are not supported on iPhone, and the app tells you so if you try one. Requires iOS 15.1 or later. Bluetooth is only requested when you start a scan. Premium is an auto-renewing subscription, charged to your Apple Account at purchase and renewing unless cancelled at least 24 hours before the period ends. Manage or cancel in your Apple Account settings. Terms of Use: Privacy Policy: Download free. Start with your car's story, not just its warning light.