# OTR Diagnostics vs YeecoreViewer

The clearest difference is rating: OTR Diagnostics at 4.0 against YeecoreViewer's 1.9. OTR Diagnostics also leads on update cadence (fortnightly vs every 6 weeks) and review sentiment (55% vs 43%). YeecoreViewer's advantage is monetization model (free vs free with in-app purchases) and iOS requirement (12.0 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 1.9. Both are backed by a comparable volume of ratings — 99 and 42 respectively. Written reviews point the same way: 55% of OTR Diagnostics's written reviews are positive against 43% of YeecoreViewer's.

OTR Diagnostics ships an update fortnightly, YeecoreViewer every 6 weeks. Both last shipped on October 15, 2026.

## The numbers

| Metric | OTR Diagnostics | YeecoreViewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (99 ratings)](https://appshunter.io/ios/app/otr-diagnostics/id1508165885/reviews)** | [1.9 (42 ratings)](https://appshunter.io/ios/app/yeecoreviewer/id1580899873/reviews) |
| Number of ratings | **99** | 42 |
| Positive reviews | **55.2% of reviews** | 42.9% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 6 weeks |
| Monetization | Free with in-app purchases | **Free** |
| Size | 267 MB | 31 MB |
| Requires iOS | 17.6 | **12.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [OTR Performance](https://appshunter.io/developer/1508165884) | [Shenzhen Fude Innovation Technology Co., Ltd.](https://appshunter.io/developer/1580899875) |

## 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


### YeecoreViewer

[App page](https://appshunter.io/ios/app/yeecoreviewer/id1580899873)

Connect to your dash cam to view recorded videos and photos. Stream content directly from the SD card or download files to your phone for easy sharing. Configure dash cam settings and review playback with GPS data.

**Highlights:** Stream dash cam videos online, Download videos and photos, Share media on social media, Playback with GPS track, Configure dash cam settings

**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 YeecoreViewer free?

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

### Which has better reviews, OTR Diagnostics or YeecoreViewer?

OTR Diagnostics is rated higher. OTR Diagnostics averages 4.0 out of 5 from 99 ratings, while YeecoreViewer averages 1.9 from 42 ratings.

### Do OTR Diagnostics or YeecoreViewer have ads?

Neither OTR Diagnostics nor YeecoreViewer shows ads.

### Which is updated more often, OTR Diagnostics or YeecoreViewer?

OTR Diagnostics ships an update fortnightly, and YeecoreViewer every 6 weeks. Most recently, OTR Diagnostics was updated on October 15, 2026 and YeecoreViewer on October 15, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*