# ShaleApps SANDi vs OTR Diagnostics

The clearest difference is monetization model: ShaleApps SANDi at free against OTR Diagnostics's free with in-app purchases. ShaleApps SANDi also leads on iOS requirement (11.0 vs 17.6). OTR Diagnostics's advantage is review sentiment (55% vs 33%) and ratings volume (99 vs 22). On price, rating, 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.

On the App Store both sit at effectively the same score — 3.9 for ShaleApps SANDi against 4.0 for OTR Diagnostics. Both are backed by a comparable volume of ratings — 22 and 99 respectively. Written reviews are what separate them: 33% of ShaleApps SANDi's written reviews are positive against 55% of OTR Diagnostics's.

ShaleApps SANDi ships an update every 2 weeks, OTR Diagnostics fortnightly. Both last shipped on October 24, 2026.

## The numbers

| Metric | ShaleApps SANDi | OTR Diagnostics |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (22 ratings)](https://appshunter.io/ios/app/shaleapps-sandi/id1360876904/reviews) | **[4.0 (99 ratings)](https://appshunter.io/ios/app/otr-diagnostics/id1508165885/reviews)** |
| Number of ratings | 22 | **99** |
| Positive reviews | 33.3% of reviews | **55.2% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Fortnightly |
| Monetization | **Free** | Free with in-app purchases |
| Size | 41 MB | 267 MB |
| Requires iOS | **11.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Vorto Technologies, LLC](https://appshunter.io/developer/1693921874) | [OTR Performance](https://appshunter.io/developer/1508165884) |

## What reviewers say

### ShaleApps SANDi

[App page](https://appshunter.io/ios/app/shaleapps-sandi/id1360876904)

Manage your last-mile logistics operations efficiently with this mobile tool. Track trucks in real-time to avoid delays caused by sand shortages and minimize demurrage costs.

**Highlights:** Real-time truck management, Prevent sand shortage delays, Reduce demurrage costs, Pocket-sized logistics solution

**Features:** macOS Compatibility

**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 ShaleApps SANDi free?

ShaleApps SANDi 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, ShaleApps SANDi or OTR Diagnostics?

OTR Diagnostics is rated higher. ShaleApps SANDi averages 3.9 out of 5 from 22 ratings, while OTR Diagnostics averages 4.0 from 99 ratings.

### Do ShaleApps SANDi or OTR Diagnostics have ads?

Neither ShaleApps SANDi nor OTR Diagnostics shows ads.

### Which is updated more often, ShaleApps SANDi or OTR Diagnostics?

ShaleApps SANDi ships an update every 2 weeks, and OTR Diagnostics fortnightly. Most recently, ShaleApps SANDi was updated on October 24, 2026 and OTR Diagnostics on October 24, 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.*