# OBD2UDS vs J1939FaultCode

The clearest difference is ads: OBD2UDS at none against J1939FaultCode's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. OBD2UDS sells 2 in-app purchases, starting at $1.99 per month and J1939FaultCode sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on October 2, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | OBD2UDS | J1939FaultCode |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Fortnightly | Fortnightly |
| Size | 34 MB | 14 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Rich Pearl Limited Corporation](https://appshunter.io/developer/1811276377) | [洋 刘](https://appshunter.io/developer/6775317751) |

## What reviewers say

### OBD2UDS

[App page](https://appshunter.io/ios/app/obd2uds-car-diagnostic-pro/id6762538700)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $1.99 | per month |
| Premium Yearly | $9.99 | per year |


### J1939FaultCode

[App page](https://appshunter.io/ios/app/j1939faultcode/id6778431735)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| J1939 Pro | $2.99 | one-time |


## Frequently asked questions

### Is OBD2UDS free?

OBD2UDS is free to download, with in-app purchases available.

### Is J1939FaultCode free?

J1939FaultCode is free to download, with in-app purchases available.

### Do OBD2UDS or J1939FaultCode have ads?

J1939FaultCode shows ads; OBD2UDS does not.

### Which is updated more often, OBD2UDS or J1939FaultCode?

OBD2UDS ships an update fortnightly, and J1939FaultCode fortnightly. Most recently, OBD2UDS was updated on October 2, 2026 and J1939FaultCode on October 17, 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.*