# HD Mobile (CanDo) vs OTR Diagnostics

The clearest difference is rating: OTR Diagnostics at 4.0 against HD Mobile (CanDo)'s 3.3. OTR Diagnostics also leads on review sentiment (55% vs 33%) and update cadence (fortnightly vs every 2 months). HD Mobile (CanDo)'s advantage is monetization model (free vs free with in-app purchases) and iOS requirement (10.3 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 3.3. Both are backed by a comparable volume of ratings — 35 and 99 respectively. Written reviews point the same way: 33% of HD Mobile (CanDo)'s written reviews are positive against 55% of OTR Diagnostics's.

HD Mobile (CanDo) ships an update every 2 months, OTR Diagnostics fortnightly. The most recent releases landed on October 6, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | HD Mobile (CanDo) | OTR Diagnostics |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.3 (35 ratings)](https://appshunter.io/ios/app/hd-mobile-cando/id1185397705/reviews) | **[4.0 (99 ratings)](https://appshunter.io/ios/app/otr-diagnostics/id1508165885/reviews)** |
| Number of ratings | 35 | **99** |
| Positive reviews | 33.3% of reviews | **55.2% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 27 MB | 267 MB |
| Requires iOS | **10.3** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Cando International Inc.](https://appshunter.io/developer/1208370212) | [OTR Performance](https://appshunter.io/developer/1508165884) |

## What reviewers say

### HD Mobile (CanDo)

[App page](https://appshunter.io/ios/app/hd-mobile-cando/id1185397705)

Transform your iOS device into a powerful diagnostic tool for class 4-8 vehicles. Perform DPF resets and regens, and scan OBDII codes to avoid costly repairs and roadside assistance.

**Highlights:** DPF reset and regen, Class 4-8 code scanner, OBDII compatibility, Vehicle diagnostic tool, iOS device integration

**In-app purchases:** none


### 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 HD Mobile (CanDo) free?

HD Mobile (CanDo) is free to download, with no in-app purchases.

### Is OTR Diagnostics free?

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

### Which has better reviews, HD Mobile (CanDo) or OTR Diagnostics?

OTR Diagnostics is rated higher. HD Mobile (CanDo) averages 3.3 out of 5 from 35 ratings, while OTR Diagnostics averages 4.0 from 99 ratings.

### Do HD Mobile (CanDo) or OTR Diagnostics have ads?

Neither HD Mobile (CanDo) nor OTR Diagnostics shows ads.

### Which is updated more often, HD Mobile (CanDo) or OTR Diagnostics?

HD Mobile (CanDo) ships an update every 2 months, and OTR Diagnostics fortnightly. Most recently, HD Mobile (CanDo) was updated on October 6, 2026 and OTR Diagnostics on October 15, 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.*