# Carista OBD2 vs DFirstCoder

The clearest difference is ads: DFirstCoder at none against Carista OBD2's shown. DFirstCoder also leads on review sentiment (67% vs 34%) and rating (4.8 vs 4.6). Carista OBD2's advantage is ratings volume (4.1K vs 5) and chart position (#181 vs unranked). On price, update cadence, in-app purchases and monetization model there is nothing between them.

Both are free to download. Carista OBD2 sells 5 in-app purchases, starting at $19.99 per month 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.

DFirstCoder holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: Carista OBD2 has 4.1K ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 34% of Carista OBD2's written reviews are positive against 67% of DFirstCoder's.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on September 23, 2026 and September 6, 2026 respectively.

## The numbers

| Metric | Carista OBD2 | DFirstCoder |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (4.1K ratings)](https://appshunter.io/ios/app/carista-obd2/id954363569/reviews) | **[4.8 (5 ratings)](https://appshunter.io/ios/app/dfirstcoder/id1637894055/reviews)** |
| Number of ratings | **4.1K** | 5 |
| Positive reviews | 34.2% of reviews | **66.7% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | **#181** | — |
| Size | 132 MB | 94 MB |
| Requires iOS | 16.4 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Prizmos](https://appshunter.io/developer/954363568) | [Shenzhen QiXin Technology Co., Ltd.](https://appshunter.io/developer/1637894777) |

## What reviewers say

### Carista OBD2

[App page](https://appshunter.io/ios/app/carista-obd2/id954363569)

**Currently charting:** #181 Top Grossing · Utilities (US App Store)

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.

**Highlights:** Customize car behavior and unlock hidden features, Diagnose and reset dashboard warning lights, Monitor real-time vehicle parameters, Perform simple DIY car maintenance procedures, Access advanced electronic diagnostics

**Features:** Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $19.99 | per month |
| 1 month Pro | $19.99 | per month |
| 3 month Pro | $29.99 | per 3 months |
| Pro | $59.99 | per year |
| One-Time Diagnostic & Reset | $9.99 | one-time |

**What reviewers like**

- 🚀 Easy to use
- 👍 Customization options
- 🚀 Efficient diagnostics
- 💡 Helpful for maintenance
- 👍 Great customer support

**What reviewers complain about**

- 💰 Expensive subscription
- 🔒 Requires account login
- 🐛 Connectivity issues
- 🔒 Locked features behind paywall
- 🐛 Unreliable functionality

**Reported bugs**

- App crashes and freezes
- Subscription issues and billing problems
- Incompatibility with certain OBD2 adapters
- Customization features not working as expected
- Inaccurate fault code detection

**Requested features**

- Support for more vehicle makes and models
- Offline diagnostics and customization
- Ability to save customization settings
- More detailed error code information
- Improved user interface and navigation


### 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 Carista OBD2 free?

Carista OBD2 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, Carista OBD2 or DFirstCoder?

DFirstCoder is rated higher. Carista OBD2 averages 4.6 out of 5 from 4.1K ratings, while DFirstCoder averages 4.8 from 5 ratings.

### Do Carista OBD2 or DFirstCoder have ads?

Carista OBD2 shows ads; DFirstCoder does not.

### Which is updated more often, Carista OBD2 or DFirstCoder?

Carista OBD2 ships an update every 3 weeks, and DFirstCoder every 3 weeks. Most recently, Carista OBD2 was updated on September 23, 2026 and DFirstCoder on September 6, 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.*