# ANCEL vs OTR Diagnostics

The clearest difference is rating: OTR Diagnostics at 4.0 against ANCEL's 2.6. OTR Diagnostics also leads on review sentiment (55% vs 24%) and update cadence (fortnightly vs every 2 months). ANCEL's advantage is monetization model (free vs free with in-app purchases) and iOS requirement (9.0 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 2.6. Both are backed by a comparable volume of ratings — 43 and 99 respectively. Written reviews point the same way: 24% of ANCEL's written reviews are positive against 55% of OTR Diagnostics's.

ANCEL ships an update every 2 months, OTR Diagnostics fortnightly. The most recent releases landed on August 1, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | ANCEL | OTR Diagnostics |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.6 (43 ratings)](https://appshunter.io/ios/app/ancel/id1434956145/reviews) | **[4.0 (99 ratings)](https://appshunter.io/ios/app/otr-diagnostics/id1508165885/reviews)** |
| Number of ratings | 43 | **99** |
| Positive reviews | 23.5% 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 | 402 MB | 266 MB |
| Requires iOS | **9.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [OBDSPACE TECHNOLOGY CO.,LTD](https://appshunter.io/developer/1434956144) | [OTR Performance](https://appshunter.io/developer/1508165884) |

## What reviewers say

### ANCEL

[App page](https://appshunter.io/ios/app/ancel/id1434956145)

This app connects to your car via an OBD2 Bluetooth scanner to diagnose faults, read data like fault codes and sensor readings, and clear error lights. It also offers battery health checks, a customizable dashboard, and driving assistance features. Some models support special functions like maintenance resets.

**Highlights:** OBD2 Bluetooth scanner connectivity, Fault code reading and clearing, Frozen frame and sensor data display, Battery health and voltage detection, Customizable dashboard, Driving assistance functions, Special functions (maintenance reset, etc.)

**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 ANCEL free?

ANCEL 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, ANCEL or OTR Diagnostics?

OTR Diagnostics is rated higher. ANCEL averages 2.6 out of 5 from 43 ratings, while OTR Diagnostics averages 4.0 from 99 ratings.

### Do ANCEL or OTR Diagnostics have ads?

Neither ANCEL nor OTR Diagnostics shows ads.

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

ANCEL ships an update every 2 months, and OTR Diagnostics fortnightly. Most recently, ANCEL was updated on August 1, 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.*