Comparison

Car Scanner OBD2 ELM vs DFirstCoder

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Car Scanner OBD2 ELM

This app functions as a universal vehicle scanner using the OBD2 standard. It connects to your car via WiFi or Bluetooth 4.0 LE adapters to diagnose and scan electronic control modules. Users need a compatible ELM327 adapter to utilize its diagnostic capabilities.

Highlights
  • Universal OBD2 scanning
  • Works with WiFi adapters
  • Works with Bluetooth 4.0 LE adapters
  • Diagnose electronic control modules (ECUs)
  • Quick start guide for ELM327 adapters
Features
Read full description

Obd Mary is a universal vehicle scanner which works according to OBD2 standard. The application works with WiFi and Bluetooth 4.0 LE adapters. Requirements: 1. You need ELM327 Bluetooth 4.0 LE or Wi-Fi adapter to connect to a vehicle using this application. 2. Your vehicle can contain some ECUs (electronic control modules), so don't forget to check all ECUs. 3. ELM adapters version 2.1 are often can be corrupted, so try to choose version 1.5 if you have a chose. Quick start guide for ELM327 adapters: 1. Download the app 2. Plug in ELM327 adapter into 16-pin diagnostic connector in your vehicle 3. Switch ON the ignition 4. Discover your WiFi or Bluetooth ELM adapter in the app settings 5. Select discovered ELM327 adapter and press 'Connect' You can make scanning and diagnosing using the application Obd Mary and Wi-Fi ELM327/BLE ELM327. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

DFirstCoder

This app provides comprehensive vehicle diagnostics and customization for car owners. It offers one-click app features for easy operation, Bluetooth connectivity, and the ability to read/clear trouble codes, perform smog checks, and view live data. It supports a wide range of vehicle models.

Highlights
  • One-click apps for easy operation
  • Comprehensive diagnostic features
  • Bluetooth wireless connectivity
  • Read and clear trouble codes
  • Smog check functionality
  • Live data display
  • Supports VAG, BMW, Mercedes-Benz models
Features
Read full description

DFirstCoder is an equipped with one-click apps feature professional OBDII Scanner App, designed for vehicle users who want to go beyond straightforward diagnostics. It includes comprehensive diagnostic features and customize numerous features of your vehicles with one-click, friendly to use even for beginners. Features: 1.2 in 1 OBDII coder. In addition to comprehensive diagnostic, one-click apps eliminate the need for tedious operation steps, making them easy to understand and operate, even for beginners. 2.Hot update. Updating the features or fixing bugs immediately without needing to update the app, it can respond to users needs and resolve functionality issue quickly. 3.Bluetooth connectivity, DFirstCoder's device supports wireless connection to your phone or tablet , and communicate with your vehicles rapidly. 4.Read & Clear codes, read the trouble codes of your vehicle and clear it. 5.Smog check. 6.MIL status. 7.Live data. 8.Freeze frame. 9.Mode 6 10.Covering a wide range of models, VAG Group, BMW Group, Mercedes-Benz, etc. are available. About DFirstCoder Information ———————————————————————————————————————————————————————————————————————————————————— DFirstCoder is an app to adapt DFirst device, owner of Shenzhen QIXIN Technology Co., LTD. It’s equipped with one-click apps and comprehensive diagnostic features. The app is free to download for user, and some of functions are free to use (e.g. clear temporary trouble codes,date-time synchronization and host reboot etc.). For more details, welcome to follow us, Website:www.dfirstcoder.com Facebook:https://www.facebook.com/qixinglobal Email: support@dfirstcoder.com Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Car Scanner OBD2 ELM4 screens
DFirstCoder3 screens

Verdict

The call

The clearest difference is ads: DFirstCoder at none against Car Scanner OBD2 ELM's shown. DFirstCoder also leads on iOS requirement (13.0 vs 15.0). Car Scanner OBD2 ELM's advantage is review sentiment (92% vs 67%) and ratings volume (39 vs 5). On price, rating, update cadence and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Car Scanner OBD2 ELM sells 4 in-app purchases, starting at $2.99 per 7 days and DFirstCoder sells 8 in-app purchases, starting at $108.99 per year. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for Car Scanner OBD2 ELM against 4.8 for DFirstCoder. That said, the two scores are not equally well evidenced: Car Scanner OBD2 ELM has 39 ratings behind it against 5, so its average is the more settled of the two. Written reviews are what separate them: 92% of Car Scanner OBD2 ELM's written reviews are positive against 67% of DFirstCoder's.

UpkeepUpdate frequency

Car Scanner OBD2 ELM ships an update fortnightly, DFirstCoder every 3 weeks. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

Scorecard4 real differences · 6 level
Car Scanner OBD2 ELM versus DFirstCoder: the parameters behind the verdict, then further details
ParameterCar Scanner OBD2 ELMDFirstCoder
PriceFreeFree
Rating4.7 (39 ratings)4.8 (5 ratings) — better
Positive reviews92.3% of reviews — better66.7% of reviews
Number of ratings39 — better5
Update frequencyFortnightly — betterEvery 3 weeks
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPodiPhone, iPod
Requires iOS15.013.0 — better
Further details — not scored
Size21 MB95 MB
Age rating4+17+
DeveloperIhar KatkavetsShenzhen QiXin Technology Co., Ltd.

Customer experience

Car Scanner OBD2 ELM

All ratings39 ratings
Positive94.9%
Neutral0.0%
Negative5.1%
Written reviews78 reviews
Positive92.3%
Neutral1.3%
Negative6.4%

DFirstCoder

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

In-app purchases

4 purchases

Car Scanner OBD2 ELM

Subscriptions3
  • Premium Weekly3 Days trial$2.997 Days
  • Premium Monthly3 Days trial$7.991 Month
  • Premium Yearly7 Days trial$29.991 Year
One-time1
  • Full Edition$9.99
8 purchases

DFirstCoder

Subscriptions2
  • Pro Plan Subscription$108.991 Year
  • Pro Plan Subscription (Family)$158.991 Year
One-time6
  • 350 QD$4.99
  • 700 QD$9.95
  • 1400 QD$19.49
Show 3 more
  • 3500 QD$49.99
  • 7000 QD$96.99
  • 10500 QD$145.99

Questions

Is Car Scanner OBD2 ELM free?
Car Scanner OBD2 ELM is free to download, with in-app purchases available.
Is DFirstCoder free?
DFirstCoder is free to download, with in-app purchases available.
Which has better reviews, Car Scanner OBD2 ELM or DFirstCoder?
DFirstCoder is rated higher. Car Scanner OBD2 ELM averages 4.7 out of 5 from 39 ratings, while DFirstCoder averages 4.8 from 5 ratings.
Do Car Scanner OBD2 ELM or DFirstCoder have ads?
Car Scanner OBD2 ELM shows ads; DFirstCoder does not.
Which is updated more often, Car Scanner OBD2 ELM or DFirstCoder?
Car Scanner OBD2 ELM ships an update fortnightly, and DFirstCoder every 3 weeks. Most recently, Car Scanner OBD2 ELM was updated on October 26, 2026 and DFirstCoder on October 24, 2026.

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