# Auto Agent vs OTR Diagnostics

The clearest difference is rating: Auto Agent at 4.9 against OTR Diagnostics's 4.0. Auto Agent also leads on ratings volume (34K vs 99) and review sentiment (75% vs 55%). OTR Diagnostics's advantage is in-app purchases (none vs 6) and update cadence (fortnightly vs every 3 months). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. Auto Agent sells 6 one-off in-app purchases. OTR Diagnostics asks for nothing beyond the download.

Auto Agent holds the better App Store score, 4.9 against 4.0. That said, the two scores are not equally well evidenced: Auto Agent has 34K ratings behind it against 99, so its average is the more settled of the two. Written reviews point the same way: 75% of Auto Agent's written reviews are positive against 55% of OTR Diagnostics's.

Auto Agent ships an update every 3 months, OTR Diagnostics fortnightly. The most recent releases landed on September 24, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Auto Agent | OTR Diagnostics |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (34K ratings)](https://appshunter.io/ios/app/auto-agent/id1110395367/reviews)** | [4.0 (99 ratings)](https://appshunter.io/ios/app/otr-diagnostics/id1508165885/reviews) |
| Number of ratings | **34K** | 99 |
| Positive reviews | **74.6% of reviews** | 55.2% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 52 MB | 266 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [EZ LYNK](https://appshunter.io/developer/1110395366) | [OTR Performance](https://appshunter.io/developer/1508165884) |

## What reviewers say

### Auto Agent

[App page](https://appshunter.io/ios/app/auto-agent/id1110395367)

Monitor, diagnose, and update your vehicle's software remotely. This powerful tool allows you to view live data, read and clear diagnostic codes, and record data for your technician. Connect directly with your mechanic for remote assistance and software updates, saving you trips to the repair shop.

**Highlights:** Display live vehicle data, Read and clear diagnostic trouble codes, Create and playback data recordings, Send data recordings to technician, Remote technician assistance, Install vehicle software updates

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 credit | $1.99 | one-time |
| 5 credits | $9.99 | one-time |
| 10 credits | $19.99 | one-time |
| 20 credits | $39.99 | one-time |
| 50 credits | $99.99 | one-time |
| 100 credits | $199.99 | one-time |

**What reviewers like**

- 🚀 Great monitoring tool
- 🔧 Useful for tuning and diagnostics
- 👍 Easy to use and navigate
- 💯 Excellent customer service
- 🔋 Improved fuel economy

**What reviewers complain about**

- 🐛 Connection issues
- 🤔 Lacking some customization options
- 🔌 Compatibility problems with updates
- 📵 No native CarPlay support
- 🤷‍♂️ Unreliable tune updates

**Reported bugs**

- App crashes and freezes
- Disconnection issues with the device
- Tune files disappearing or becoming inaccessible
- Compatibility problems with iOS 14 updates
- Unreliable Wi-Fi connectivity

**Requested features**

- Native support for Apple CarPlay
- More customization options for gauges and titles
- Ability to monitor more parameters
- Improved GPS speed accuracy
- Sound alerts for warning indicators


### 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


## Frequently asked questions

### Is Auto Agent free?

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

### Is OTR Diagnostics free?

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

### Which has better reviews, Auto Agent or OTR Diagnostics?

Auto Agent is rated higher. Auto Agent averages 4.9 out of 5 from 34K ratings, while OTR Diagnostics averages 4.0 from 99 ratings.

### Do Auto Agent or OTR Diagnostics have ads?

Neither Auto Agent nor OTR Diagnostics shows ads.

### Which is updated more often, Auto Agent or OTR Diagnostics?

Auto Agent ships an update every 3 months, and OTR Diagnostics fortnightly. Most recently, Auto Agent was updated on September 24, 2026 and OTR Diagnostics on September 23, 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.*