# OTR Diagnostics vs PowerDrive Plus

The clearest difference is rating: OTR Diagnostics at 4.0 against PowerDrive Plus's 1.9. OTR Diagnostics also leads on review sentiment (55% vs 13%). PowerDrive Plus's advantage is monetization model (free vs free with in-app purchases) and iOS requirement (9.0 vs 17.6). On price, ratings volume, update cadence and ads 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 1.9. Both are backed by a comparable volume of ratings — 99 and 38 respectively. Written reviews point the same way: 55% of OTR Diagnostics's written reviews are positive against 13% of PowerDrive Plus's.

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on September 23, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | OTR Diagnostics | PowerDrive Plus |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (99 ratings)](https://appshunter.io/ios/app/otr-diagnostics/id1508165885/reviews)** | [1.9 (38 ratings)](https://appshunter.io/ios/app/powerdrive-plus/id1583585712/reviews) |
| Number of ratings | **99** | 38 |
| Positive reviews | **55.2% of reviews** | 13.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | Fortnightly |
| Monetization | Free with in-app purchases | **Free** |
| Size | 266 MB | 3 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 app helps heavy-duty truck owners diagnose and resolve common issues like fault codes, regen problems, and derates. It provides plain-language explanations of error codes, allows for bi-directional commands to fix issues, and monitors live truck data to prevent downtime.

**Highlights:** AI-powered fault code explanation, Bi-directional commands for repairs, Reset active/inactive fault codes, Run forced DPF/SCR regens, Live data monitoring, Fault code history tracking

**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


### PowerDrive Plus

[App page](https://appshunter.io/ios/app/powerdrive-plus/id1583585712)

Control your inverter's full settings remotely using your connected device. Monitor battery voltage, output power, and temperature, and set protection alarms from a distance. Easily adjust personal settings and test your battery.

**Highlights:** Remote inverter control, Monitor battery voltage, Monitor output power, Monitor product temperature, Set protection alarms, Adjust personal settings, Test battery

**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 PowerDrive Plus free?

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

### Which has better reviews, OTR Diagnostics or PowerDrive Plus?

OTR Diagnostics is rated higher. OTR Diagnostics averages 4.0 out of 5 from 99 ratings, while PowerDrive Plus averages 1.9 from 38 ratings.

### Do OTR Diagnostics or PowerDrive Plus have ads?

Neither OTR Diagnostics nor PowerDrive Plus shows ads.

### Which is updated more often, OTR Diagnostics or PowerDrive Plus?

OTR Diagnostics ships an update fortnightly, and PowerDrive Plus fortnightly. Most recently, OTR Diagnostics was updated on September 23, 2026 and PowerDrive Plus on September 19, 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.*