# Proformance Link vs J1939FaultCode

The clearest difference is update cadence: J1939FaultCode at every 4 days against Proformance Link's every 2 weeks. Proformance Link's advantage is device support (3 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Proformance Link ships an update every 2 weeks, J1939FaultCode every 4 days. The most recent releases landed on September 26, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Proformance Link | J1939FaultCode |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (4 ratings)](https://appshunter.io/ios/app/proformance-link/id6755274184/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 4 days** |
| Monetization | Free | — |
| Size | 53 MB | 11 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Proformance Diagnostics LLC](https://appshunter.io/developer/1852904316) | [洋 刘](https://appshunter.io/developer/6775317751) |

## What reviewers say

### Proformance Link

[App page](https://appshunter.io/ios/app/proformance-link/id6755274184)

This diagnostic tool connects to trucks via Bluetooth to read and clear fault codes, monitor data streams, and perform DPF regeneration and speed limit calibration. It supports various popular truck engine models and offers real-time updates for advanced functions.

**Highlights:** Bluetooth connectivity, Fault code lookup and clearing, Data stream viewing, DPF regeneration and reset, Speed limit calibration, Supports multiple engine models

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

**In-app purchases:** none


### J1939FaultCode

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Proformance Link free?

Proformance Link is free to download, with no in-app purchases.

### Is J1939FaultCode free?

J1939FaultCode is free to download, with no in-app purchases.

### Do Proformance Link or J1939FaultCode have ads?

Neither Proformance Link nor J1939FaultCode shows ads.

### Which is updated more often, Proformance Link or J1939FaultCode?

Proformance Link ships an update every 2 weeks, and J1939FaultCode every 4 days. Most recently, Proformance Link was updated on September 26, 2026 and J1939FaultCode on September 18, 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.*