# Car Scanner OBD2 ELM vs DFirstCoder

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.

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.

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.

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.

## The numbers

| Metric | Car Scanner OBD2 ELM | DFirstCoder |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (39 ratings)](https://appshunter.io/ios/app/car-scanner-obd2-elm-obd-mary/id1456542840/reviews) | **[4.8 (5 ratings)](https://appshunter.io/ios/app/dfirstcoder/id1637894055/reviews)** |
| Number of ratings | **39** | 5 |
| Positive reviews | **92.3% of reviews** | 66.7% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 21 MB | 95 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Ihar Katkavets](https://appshunter.io/developer/1439778280) | [Shenzhen QiXin Technology Co., Ltd.](https://appshunter.io/developer/1637894777) |

## What reviewers say

### Car Scanner OBD2 ELM

[App page](https://appshunter.io/ios/app/car-scanner-obd2-elm-obd-mary/id1456542840)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly | $2.99 | per 7 days |
| Premium Monthly | $7.99 | per month |
| Premium Yearly | $29.99 | per year |
| Full Edition | $9.99 | one-time |


### DFirstCoder

[App page](https://appshunter.io/ios/app/dfirstcoder/id1637894055)

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:** Family Sharing

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Plan Subscription | $108.99 | per year |
| Pro Plan Subscription (Family) | $158.99 | per year |
| 350 QD | $4.99 | one-time |
| 700 QD | $9.95 | one-time |
| 1400 QD | $19.49 | one-time |
| 3500 QD | $49.99 | one-time |
| 7000 QD | $96.99 | one-time |
| 10500 QD | $145.99 | one-time |


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*