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Best Gaius Diagnostic Apps

215+ iOS apps curated and reviewed

4.4 avg rating
20 free apps
Updated June 2026

From beginner-friendly picks to power-user tools, our gaius diagnostic list covers 215+ iPhone apps updated through June 2026. Compare ratings, prices, and screenshots in one place.

Compare top Gaius Diagnostic Apps (June 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Gaius DiagnosticGaius DiagnosticFree—NoNoMay 2026
2Carly — OBD2 car scannerCarly — OBD2 car scannerFree4.6★ (9.8K)NoYesJul 2026
3Car Scanner | OBD Auto DoctorCar Scanner | OBD Auto DoctorFree4.4★ (6.1K)YesYesJul 2026
4Carista OBD2Carista OBD2Free4.6★ (3.9K)YesYesJul 2026
5FIXD OBD2 ScannerFIXD OBD2 ScannerFree4.6★ (26K)NoYesJul 2026
6Auto AgentAuto AgentFree4.9★ (34K)NoYesJul 2026
7Car Scanner ELM OBD2Car Scanner ELM OBD2Free4.8★ (31K)YesYesJul 2026
8OBD JScanOBD JScanFree4.7★ (1.3K)NoYesJul 2026

Top Picks for Gaius Diagnostic

Carly — OBD2 car scanner#2

Carly — OBD2 car scanner by Carly Solutions GmbH Co KG

Diagnose, Code and Service
Strong Contender
📊 Productivity
4.6😐(9.8K ratings)
FreeIn-App Purchases
Carly — OBD2 car scanner screenshot 1
Carly — OBD2 car scanner screenshot 2
Carly — OBD2 car scanner screenshot 3
Carly — OBD2 car scanner screenshot 4
Carly — OBD2 car scanner screenshot 5
Carly — OBD2 car scanner screenshot 6

This app allows car owners to diagnose issues, monitor live engine data, and perform maintenance tasks. It offers advanced features like coding hidden car functions and detecting mileage manipulation, helping users save on repairs and understand their vehicle's health.

What We Love

  • 👍 Great customer service
  • 🚀 Lots of functionality
  • 💡 Useful diagnostic and coding features
  • 🔒 Secure and reliable

Room to Improve

  • 💰 Expensive subscription model
  • 🐛 Connectivity and compatibility issues
  • 🔍 Limited functionality for some vehicles
Car Scanner | OBD Auto Doctor#3

Car Scanner | OBD Auto Doctor by Creosys Oy

OBD2 diagnostics for ELM 327
Worth Considering
🔧 Utilities
4.4😐(6.1K ratings)
FreeAdsIn-App Purchases
Car Scanner | OBD Auto Doctor screenshot 1
Car Scanner | OBD Auto Doctor screenshot 2
Car Scanner | OBD Auto Doctor screenshot 3
Car Scanner | OBD Auto Doctor screenshot 4
Car Scanner | OBD Auto Doctor screenshot 5
Car Scanner | OBD Auto Doctor screenshot 6

Diagnose your car's engine light issues and monitor real-time performance data. This app allows you to read and clear diagnostic trouble codes, track fuel consumption, and view sensor data. It's a comprehensive tool for understanding your vehicle's health.

What We Love

  • 🚀 Works great
  • 👍 Easy to use
  • 🚀 Accurate diagnostics
  • 🚀 Extensive adapter support

Room to Improve

  • 🔒 Requires subscription for full functionality
  • 🐛 Connection issues
  • 🐛 Inconsistent performance

More Gaius Diagnostic apps to explore

4
Carista OBD2
Carista OBD2
Carista OBD2
Code, Service, Diagnose cars
Free

This app acts as a DIY car mechanic, allowing you to customize features, diagnose warning lights, monitor live data, and perform maintenance. Save time and money by handling common car tasks yourself.

Customize car behavior and unlock hidden featuresDiagnose and reset dashboard warning lightsMonitor real-time vehicle parameters
🔧 Utilities
(3.9K)
free with in-app purchases
5
FIXD OBD2 Scanner
FIXD OBD2 Scanner
FIXD OBD2 Scanner
Clear Your Check Engine Light
Free

This app translates your car's diagnostic trouble codes into plain language, helping you understand potential issues and their severity. It provides maintenance reminders and offers advanced features like issue forecasting and emissions pre-checks with a premium subscription.

Translate check engine light codesUnderstand issue severityMaintenance reminders
🔧 Utilities
(26K)
free with in-app purchases
6
Auto Agent
Auto Agent
Auto Agent
by EZ LYNK
Free

Monitor, diagnose, and update your vehicle's software remotely. This powerful tool allows you to view live data, read and clear diagnostic codes, and record data for your technician. Connect directly with your mechanic for remote assistance and software updates, saving you trips to the repair shop.

Display live vehicle dataRead and clear diagnostic trouble codesCreate and playback data recordings
🔧 Utilities
(34K)
free with in-app purchases
7
Car Scanner ELM OBD2
Car Scanner ELM OBD2
Car Scanner ELM OBD2
The best OBD2 diagnostic tool!
Free

Monitor your car's performance, diagnose engine issues, and view sensor data in real-time. Customize your dashboard with gauges and charts, and reset fault codes. Supports a wide range of vehicles and offers advanced features for specific car brands.

Real-time sensor dataOBD fault code reading and resettingCustomizable dashboard with gauges
🔧 Utilities
(31K)
free with in-app purchases
8
OBD JScan
OBD JScan
OBD JScan
by Piotr Bialic
Free

This app provides advanced diagnostics for Jeep, Chrysler, and Dodge vehicles. It allows users to read and clear trouble codes, view live sensor data, and access settings across all vehicle modules, including ABS and transmission.

Read/Clear Diagnostic Trouble CodesAccess Live Data from all sensorsView vehicle settings
🔧 Utilities
(1.3K)
free with in-app purchases
9
MyRacePass
MyRacePass
MyRacePass
The Ultimate Racing Resource
Free

Access real-time racing lineups, results, and track information. Follow favorite series, view standings, and get event updates. Includes fantasy racing and announcer audio.

Real-time lineups and resultsTrack and series followingLive timing and lap data
⚽ Sports
(11K)
free with in-app purchases
10
OBDeleven – OBD2 car scanner
OBDeleven – OBD2 car scanner
OBDeleven – OBD2 car scanner
Diagnostics, service & coding
Free

Transform your smartphone into a powerful car diagnostic and customization tool. Easily scan trouble codes, monitor live data, and access advanced features like coding and service functions for a wide range of car brands. Save time and money on car maintenance and personalization.

Basic OBD2 diagnosticsLive data monitoringAdvanced diagnostics for licensed brands
🔧 Utilities
(1.2K)
free with in-app purchases
11
CarBuzz - Car News and Reviews
CarBuzz - Car News and Reviews
CarBuzz - Car News and Reviews
by Valnet Inc
Free

Stay updated with the latest automotive industry news, reviews, and rumors. Features high-quality images, technical specifications, and social networking capabilities for car enthusiasts.

Daily automotive news updatesCar reviews and previewsLatest rumors and spy shots
📡 News
(535)
free with in-app purchases
12
BlueDriver OBD2 Scan Tool
BlueDriver OBD2 Scan Tool
BlueDriver OBD2 Scan Tool
Fear No Fix™
Free

This app turns your smartphone into a powerful OBD2 scan tool. It allows you to read and clear trouble codes, view live data, and generate detailed repair reports for your vehicle. Understand your car's issues and make informed repair decisions.

Read and clear trouble codes (Check Engine, ABS, etc.)Generate professional-grade Repair ReportsAccess Mode 6 and smog readiness data
📊 Productivity
(14K)
free with in-app purchases
13
Xtool Anyscan
Xtool Anyscan
Xtool Anyscan
OBD Diagnostic
Free

This smart diagnostic system connects to your iPhone or iPad to provide on-demand vehicle diagnostics. It offers comprehensive coverage for a wide range of car makes and includes full system diagnosis with various special functions.

Comprehensive vehicle coverageFull system diagnosisSpecial functions
🔧 Utilities
(70)
free
14
Samsara Driver
Samsara Driver
Samsara Driver
by Samsara Networks Inc
Free

This app helps professional drivers manage daily tasks efficiently and safely. It streamlines Hours of Service compliance, vehicle inspections, and navigation. Drivers can also track performance, receive recognition, and access support, all within a single, easy-to-use interface.

Hours of Service (HOS) logging and complianceVehicle inspection and DVIR submissionSafety scores and coaching tasks
🔧 Utilities
(37K)
free
15
Elitek
Elitek
Elitek
Vehicle Diagnostic Services
Free

This app allows you to perform vehicle scans and connect with a technician using a compatible device. It offers pre- and post-scans, vehicle programming, and automatic email delivery of results and invoices.

Pre- and Post-vehicle scansVehicle programmingRemote technician support
🔧 Utilities
(9)
free
16
FORScan Viewer
FORScan Viewer
FORScan Viewer
Ford, Mazda, Lincoln, Mercury
Free

This application allows users to read and view information about the on-board network of Ford, Mazda, Lincoln, and Mercury vehicles. It supports various OBD adapters and displays diagnostic trouble codes for all modules.

Read vehicle on-board network configurationView Diagnostic Trouble Codes (DTC)Supports Ford, Mazda, Lincoln, Mercury vehicles
🔧 Utilities
(103)
free
17
RepairSolutions2
RepairSolutions2
RepairSolutions2
by Innova Electronics
Free

This app provides comprehensive vehicle care and repair information for car and truck owners, DIYers, and technicians. It offers diagnostic capabilities with compatible OBD2 scanners and a vast database of verified fixes from ASE Master Technicians. Users can also access free vehicle maintenance information and schedule repairs.

OBD2 scanner integrationVerified repair databaseDiagnostic trouble code definitions
🔧 Utilities
(33K)
free with in-app purchases
18
CARFAX Car Care
CARFAX Car Care
CARFAX Car Care
Track Maintenance & Repairs
Free

Manage your vehicle's maintenance and repair history in one convenient app. Receive service reminders, get repair cost estimates, and track mileage and fuel efficiency. Stay informed about safety recalls and find trusted service centers.

Customized dashboard with service due datesService history and maintenance alertsRepair cost estimates
🌟 Lifestyle
(124K)
free with in-app purchases
19
myBuick
myBuick
myBuick
Start, Lock & Schedule Service
Free

Control your vehicle remotely, monitor its status, and access important information. Schedule maintenance and get assistance when you need it, all from your smartphone.

Remote start, lock, and unlockMonitor fuel, tire pressure, and oil lifeView odometer readings
🌟 Lifestyle
(112K)
free with in-app purchases
20
OBDLink
OBDLink
OBDLink
by OBD Solutions LLC
Free

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.

Read and clear diagnostic trouble codesDisplay real-time vehicle dataCustomizable dashboards
✈️ Travel
(12K)
free with in-app purchases

FAQ about Gaius Diagnostic

Are there free gaius diagnostic apps for iPhone?
Yes — 20 of the top gaius diagnostic apps we rank are free to download, including Gaius Diagnostic and Carly — OBD2 car scanner.
Gaius Diagnostic has no ads and has no in-app purchases, according to its App Store listing as of June 2026.
We track 215+ gaius diagnostic apps on the iOS App Store as of June 2026, ranked by rating, recency, and analysis of real user reviews.