250+ iOS apps curated and reviewed
From beginner-friendly picks to power-user tools, our diagonalobdii list covers 250+ iPhone apps updated through July 2026. Compare ratings, prices, and screenshots in one place.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | Free | 5.0★ (1) | No | Yes | Aug 2026 |
| 2 |  | Free | 4.6★ (48) | No | Yes | Aug 2026 |
| 3 |  | Free | 4.6★ (5K) | No | Yes | Aug 2026 |
| 4 |  | Free | 4.5★ (4K) | No | No | Aug 2026 |
| 5 |  | Free | 4.3★ (11) | Yes | Yes | Aug 2026 |
| 6 |  | Free | 5.0★ (1) | No | Yes | Aug 2026 |
| 7 |  | Free | 5.0★ (2) | — | No | Jun 2026 |
| 8 |  | Free | 5.0★ (3) | No | Yes | Jul 2026 |
This app helps mechanics perform vehicle drive cycles more efficiently. It provides real-time monitoring of emissions monitors and diagnostic trouble codes (DTCs), offering clear guidance and instant explanations to ensure vehicles pass inspection quickly and accurately.
Transform your smartphone into a comprehensive car diagnostic tool. Read and clear trouble codes, monitor real-time vehicle performance, and customize your dashboard for a deeper understanding of your car's health. Includes free engine diagnostics with optional advanced features for specific brands.
Transform your smartphone into a professional car diagnostic tool. Read and clear engine fault codes, monitor real-time sensor data, and perform advanced diagnostics without a mechanic. Supports a wide range of OBD2 compliant vehicles.
This app provides professional-level vehicle diagnostics, offering features like reading/clearing fault codes, data flow analysis, and special maintenance functions. It supports a wide range of car brands and allows users to subscribe to specific diagnostic software. Connects via Bluetooth to your smartphone for intelligent vehicle analysis.
Transform your iPhone into a powerful car diagnostic tool. Read and clear trouble codes, monitor live vehicle sensor data, and understand check engine light warnings. Works with most vehicles manufactured since 1996 using standard OBD2 adapters.
Transforms your iPhone into a car's onboard computer. It automatically logs trips, monitors vehicle health, and provides detailed diagnostics via an OBD2 adapter. Offers fuel tracking, maintenance reminders, and a live dashboard.
Get AI-powered insights into your car's issues by describing symptoms. Understand warning lights, strange noises, and performance problems with clear explanations and repair cost estimates. No mechanical expertise or OBD2 scanner needed.
Transform your smartphone into a powerful car diagnostic tool. Connect with a compatible OBD2 adapter to read trouble codes, monitor live sensor data, and understand your vehicle's health in real-time. Gain clarity on warning lights and prevent costly repairs with this intuitive automotive companion.
This app connects you to your Audi, offering intelligent route planning, an AI assistant for vehicle information, and remote control of key functions. It enhances your driving experience by making it smarter and more convenient, regardless of your vehicle type.
Control your vehicle remotely, including starting the engine and adjusting climate. Locate your car, monitor key metrics like fuel and tire pressure, and schedule maintenance or request roadside assistance directly from your smartphone.
This app connects to a smart OBD dongle to provide vehicle health checks, diagnosis, and real-time monitoring. It helps identify fault codes, analyze driving habits, and offers maintenance reminders for enhanced driving safety.
Manage your Mazda ownership with ease. Schedule service, find dealers, access manuals, and get roadside assistance. Enhance your experience with remote start, lock/unlock, and vehicle health monitoring for connected vehicles.
Access real-time vehicle data and perform full system scans to detect and diagnose fault codes. Get detailed engineering descriptions and recommended fixes instantly for your car's electronic control units.
Manage your vehicle finances with this app. Track fuel efficiency, maintenance costs, and expenses in one place. Visualize data with charts and receive smart insights to save money and time.
Track fuel expenses, operating costs, and maintenance for all your vehicles. Gain insights into total cost of ownership and improve efficiency with smart reminders and analytics.
Transform your phone into a powerful car diagnostic tool. Read and clear trouble codes, monitor real-time engine data, and track fuel economy. Generate detailed reports for easy sharing and analysis.
Transform your phone into a smart car dashboard with navigation, music, and calls. Enjoy a distraction-free driving experience with large controls and an always-on screen, no extra hardware needed.
This professional diagnostic tool provides in-depth analysis and control for GM, Ford, and Chrysler vehicles. It allows reading and clearing diagnostic trouble codes, performing relearn procedures, and managing vehicle security systems.