Best Diagnostic App

249+ iOS apps curated and reviewed

4.2 avg rating
20 free apps
Updated August 2026

If you already know Phone Diagnostics, this is the deeper bench. 249+ diagnostic app for iPhone, all reviewed and ranked by user rating, recency, and download trend as of August 2026.

Compare top Diagnostic App (August 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Phone DiagnosticsPhone DiagnosticsFree3.8★ (86)NoYesAug 2026
2Apple SupportApple SupportFree3.9★ (33K)NoYesSep 2026
3Car Scanner ELM OBD2Car Scanner ELM OBD2Free4.8★ (32K)YesYesSep 2026
4Diagnostic AppDiagnostic AppFreeNoNoJul 2026
5RepairSolutions2RepairSolutions2Free4.8★ (37K)NoYesSep 2026
6Mercury Diagnostic AppMercury Diagnostic AppFree3.0★ (1)NoNoAug 2026
7Device Monitor²Device Monitor²Free4.7★ (9.2K)NoYesSep 2026
8Dipfit™ App V2Dipfit™ App V2FreeNoNoAug 2026

Top Picks for Diagnostic App

Phone Diagnostics#1

Phone Diagnostics by HITEK_NOVA

Test & Find Repair Shop
Editor's Choice
🔧 Utilities
3.8(86 ratings)
FreeIn-App Purchases
Phone Diagnostics screenshot 1
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Easily test and check all mobile device functionalities. This app is useful before purchasing a device, sending it for repair, or after receiving it back. It also helps you locate nearby repair shops.

Apple Support#2

Apple Support by Apple

We’re here to help
Strong Contender
🔧 Utilities
3.9😐(33K ratings)
Free
Apple Support screenshot 1
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Access personalized solutions for all your Apple products and services in one convenient app. Troubleshoot issues with guided steps, chat with support, manage subscriptions, reset passwords, and find nearby service locations for Genius Bar appointments.

What We Love

  • 👍 Helpful and friendly support staff
  • 🚀 Quick response and resolution of issues
  • 💡 Useful troubleshooting features
  • 🔒 Secure and trustworthy service

Room to Improve

  • 🐛 Buggy and unreliable app performance
  • 🤖 Lack of knowledgeable support staff
  • ⏱️ Long wait times and repeated transfers
  • 🤔 Confusing navigation and limited options
Car Scanner ELM OBD2#3

Car Scanner ELM OBD2 by Stanislav Svistunov

The best OBD2 diagnostic tool!
Worth Considering
🔧 Utilities
4.8😊(32K ratings)
FreeAdsIn-App Purchases
Car Scanner ELM OBD2 screenshot 1
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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.

What We Love

  • 🚀 Works great with cheap OBD2 adapters
  • 👍 Highly customizable dashboard
  • 👍 Comprehensive sensor data
  • 👍 Helpful error code lookup
  • 👍 Frequent updates
  • 👍 Affordable pro version
  • 👍 Supports many vehicle makes/models

Room to Improve

  • 🐛 Occasional connection issues
  • 🐛 Incorrect sensor readings for some vehicles
  • 🐛 Crashes or freezes on some devices
  • 🔋 Drains battery when left running

More Diagnostic App apps to explore

FAQ about Diagnostic App

What is the best diagnostic app for iPhone?
Phone Diagnostics tops our diagnostic app ranking as of August 2026, with a 3.8-star average from 86 App Store ratings, and it's free to download.
Yes — 20 of the top diagnostic app we rank are free to download, including Phone Diagnostics and Apple Support.
Phone Diagnostics has no ads and offers in-app purchases, according to its App Store listing as of August 2026.
We track 249+ diagnostic app on the iOS App Store as of August 2026, ranked by rating, recency, and analysis of real user reviews.
This application allows users to easily test and check the various functionalities of their mobile devices. It's designed for use before purchasing a device, before sending it for repair, or after it has been repaired to verify its condition. It also assists in locating nearby repair shops.
Key features include comprehensive device functionality testing, the ability to check hardware before buying a new or used phone, and verification of repairs. Additionally, it helps users find repair shops in their vicinity and can be utilized by quality control staff in repair shops or refurbishing factories to improve efficiency.

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