# OTR Diagnostics vs Stowlog

The clearest difference is review sentiment: OTR Diagnostics at 55% against Stowlog's 0%. OTR Diagnostics also leads on rating (4.0 vs 2.4) and ratings volume (99 vs 19). Stowlog's advantage is monetization model (free vs free with in-app purchases). On price, update cadence, 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 2.4. That said, the two scores are not equally well evidenced: OTR Diagnostics has 99 ratings behind it against 19, so its average is the more settled of the two. Written reviews point the same way: 55% of OTR Diagnostics's written reviews are positive against 0% of Stowlog's.

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on September 23, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | OTR Diagnostics | Stowlog |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (99 ratings)](https://appshunter.io/ios/app/otr-diagnostics/id1508165885/reviews)** | [2.4 (19 ratings)](https://appshunter.io/ios/app/stowlog/id6463200501/reviews) |
| Number of ratings | **99** | 19 |
| Positive reviews | **55.2% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | Fortnightly |
| Monetization | Free with in-app purchases | **Free** |
| Size | 266 MB | 115 MB |
| Requires iOS | 17.6 | **16.4** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [OTR Performance](https://appshunter.io/developer/1508165884) | [ESTUDIO CACTUS MEDIA S.L.](https://appshunter.io/developer/1079380451) |

## 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


### Stowlog

[App page](https://appshunter.io/ios/app/stowlog/id6463200501)

This app digitizes port facility procedures to enhance safety and security. It aims to reduce accidents and detect potential threats, leading to a more efficient and secure environment.

**Highlights:** Digitizes facility procedures, Enhances real-time information, Reduces accidents, Detects potential threats, Improves facility efficiency

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is OTR Diagnostics free?

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

### Is Stowlog free?

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

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

OTR Diagnostics is rated higher. OTR Diagnostics averages 4.0 out of 5 from 99 ratings, while Stowlog averages 2.4 from 19 ratings.

### Do OTR Diagnostics or Stowlog have ads?

Neither OTR Diagnostics nor Stowlog shows ads.

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

OTR Diagnostics ships an update fortnightly, and Stowlog fortnightly. Most recently, OTR Diagnostics was updated on September 23, 2026 and Stowlog on September 17, 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.*