# OTR Diagnostics vs Cummins Inverter

The clearest difference is review sentiment: OTR Diagnostics at 55% against Cummins Inverter's 9%. OTR Diagnostics also leads on rating (4.0 vs 1.5) and update cadence (weekly vs monthly). Cummins Inverter's advantage is iOS requirement (9.0 vs 17.6). On price, ratings volume, ads and in-app purchases there is nothing between them.

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

OTR Diagnostics holds the better App Store score, 4.0 against 1.5. Both are backed by a comparable volume of ratings — 99 and 37 respectively. Written reviews point the same way: 55% of OTR Diagnostics's written reviews are positive against 9% of Cummins Inverter's.

OTR Diagnostics ships an update weekly, Cummins Inverter monthly. Both last shipped on November 3, 2026.

## The numbers

| Metric | OTR Diagnostics | Cummins Inverter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (99 ratings)](https://appshunter.io/ios/app/otr-diagnostics/id1508165885/reviews)** | [1.5 (37 ratings)](https://appshunter.io/ios/app/cummins-inverter/id1643468237/reviews) |
| Number of ratings | **99** | 37 |
| Positive reviews | **55.2% of reviews** | 9.1% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Monthly |
| Monetization | Free | Free |
| Size | 268 MB | 2 MB |
| Requires iOS | 17.6 | **9.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [OTR Performance](https://appshunter.io/developer/1508165884) | [DAS Companies Inc](https://appshunter.io/developer/982967506) |

## What reviewers say

### OTR Diagnostics

[App page](https://appshunter.io/ios/app/otr-diagnostics/id1508165885)

This diagnostic tool helps heavy-duty truck owners understand and resolve fault codes, perform crucial maintenance tasks like regens, and monitor live engine data. It aims to reduce downtime and avoid costly dealer visits by empowering users with detailed insights and control over their vehicle's systems.

**Highlights:** Reset active and inactive fault codes, Perform forced DPF/SCR regens, Understand fault codes in plain language, Monitor live engine data, Track fault code history, Bi-directional commands for repairs

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

**In-app purchases:** none

**What reviewers like**

- 💰 Saves money on repairs
- 🛠️ Clears fault codes
- 🔄 Performs forced regens
- ✅ Works with various engines
- 👍 Easy to use

**What reviewers complain about**

- 💸 Overpriced
- 🐛 Buggy and unstable app
- 🔌 Frequent Bluetooth disconnects
- 📉 Updates cause problems
- ❌ Some features disappeared after updates

**Reported bugs**

- App constantly disconnects from device
- Generic code option disappeared
- Forced regen is no longer consistent
- AI assistant not working
- App asks to do things not available in app

**Requested features**

- Remember email address for login
- Allow offline functionality without data connection
- Add option to change speed
- More detailed diagnostic information
- Allow basic subscription to work on multiple VINs


### Cummins Inverter

[App page](https://appshunter.io/ios/app/cummins-inverter/id1643468237)

Control and monitor your Cummins Inverter TM BluetoothTM inverter directly from your iPhone. View real-time battery voltage, output power, and temperature. Set up protection alarms remotely for under voltage, over voltage, overload, and over-temperature.

**Highlights:** Bluetooth inverter control, Monitor battery voltage, View output power, Check product temperature, Set protection alarms remotely, Personal settings and battery testing

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is OTR Diagnostics free?

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

### Is Cummins Inverter free?

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

### Which has better reviews, OTR Diagnostics or Cummins Inverter?

OTR Diagnostics is rated higher. OTR Diagnostics averages 4.0 out of 5 from 99 ratings, while Cummins Inverter averages 1.5 from 37 ratings.

### Do OTR Diagnostics or Cummins Inverter have ads?

Neither OTR Diagnostics nor Cummins Inverter shows ads.

### Which is updated more often, OTR Diagnostics or Cummins Inverter?

OTR Diagnostics ships an update weekly, and Cummins Inverter monthly. Most recently, OTR Diagnostics was updated on November 3, 2026 and Cummins Inverter on November 3, 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.*