Best Gap Diagnostic Apps

212+ iOS apps curated and reviewed

4.4 avg rating
20 free apps
Updated May 2026

Every iPhone needs a few good gap diagnostic apps. We benchmark 212+ of them on App Store rating, freshness, and pricing, then surface the standouts so you don't have to scroll the App Store yourself.

Compare top Gap Diagnostic Apps (May 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1IIDControlIIDControlFree3.9★ (14)NoNoJun 2026
2GAP FlasherGAP FlasherFree4.6★ (5)NoNoMay 2026
3CopiTrailCopiTrailFree1.0★ (1)NoNoMay 2026
4Carly — OBD2 car scannerCarly — OBD2 car scannerFree4.6★ (9.9K)NoYesSep 2026
5Startech LMStartech LMFreeNoNoMay 2026
6H&MH&MFree4.8★ (238K)NoNoSep 2026
7Abercrombie & FitchAbercrombie & FitchFree4.9★ (324K)NoNoSep 2026
8Hollister Co.Hollister Co.Free4.9★ (637K)NoNoSep 2026

Top Picks for Gap Diagnostic

IIDControl#1

IIDControl by GAP Innovation

Editor's Choice
🔧 Utilities
3.9(14 ratings)
Free
IIDControl screenshot 1
IIDControl screenshot 2
IIDControl screenshot 3
IIDControl screenshot 4
IIDControl screenshot 5

Control Land Rover diagnostic tools like IIDTool and EASControl via Bluetooth from your iPhone or iPad. Offers faster navigation, live data display, and fault listing with email transmission.

GAP Flasher#2

GAP Flasher by Gap Diagnostic

Strong Contender
🔧 Utilities
4.6(5 ratings)
Free
GAP Flasher screenshot 1

This utility app enables communication with specific hardware devices through a user-friendly Bluetooth interface. It simplifies device operation for users with compatible hardware.

CopiTrail#3

CopiTrail by Gap Diagnostic

Worth Considering
🔧 Utilities
1.0(1 ratings)
Free
CopiTrail screenshot 1
CopiTrail screenshot 2
CopiTrail screenshot 3

This navigation system and driving aid provides real-time vehicle data, including speed, fuel, and custom metrics like Boost and MAP sensor readings. It features a configurable map, group tracking, and day/night themes for enhanced off-road or high-speed adventures.

More Gap Diagnostic apps to explore

FAQ about Gap Diagnostic

What are the best gap diagnostic apps for iPhone?
IIDControl tops our gap diagnostic apps ranking as of May 2026, with a 3.9-star average from 14 App Store ratings, and it's free to download.
Yes — 20 of the top gap diagnostic apps we rank are free to download, including IIDControl and GAP Flasher.
IIDControl has no ads and has no in-app purchases, according to its App Store listing as of May 2026.
We track 212+ gap diagnostic apps on the iOS App Store as of May 2026, ranked by rating, recency, and analysis of real user reviews.
IIDControl is an iOS application that allows users to control IIDTool and EASControl diagnostic tools for Land Rover vehicles using Bluetooth. It provides an alternative interface to the tool's integrated display and offers additional features.
IIDControl is compatible with iPhone, iPad, and iPod devices. It utilizes Bluetooth Smart for connectivity with the diagnostic tools.