# Advancer AD20 vs KDIAG

The clearest difference is rating: KDIAG at 3.3 against Advancer AD20's 2.4. KDIAG also leads on review sentiment (31% vs 14%). Advancer AD20's advantage is ratings volume (64 vs 20) and iOS requirement (12.0 vs 17.0). 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.

KDIAG holds the better App Store score, 3.3 against 2.4. Both are backed by a comparable volume of ratings — 64 and 20 respectively. Written reviews point the same way: 14% of Advancer AD20's written reviews are positive against 31% of KDIAG's.

Advancer AD20 ships an update monthly, KDIAG fortnightly. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Advancer AD20 | KDIAG |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.4 (64 ratings)](https://appshunter.io/ios/app/advancer-ad20/id6444664990/reviews) | **[3.3 (20 ratings)](https://appshunter.io/ios/app/kdiag/id6450169808/reviews)** |
| Number of ratings | **64** | 20 |
| Positive reviews | 13.9% of reviews | **30.8% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Fortnightly** |
| Monetization | Free | Free |
| Size | 496 MB | 74 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [深圳市云伽未来智能技术有限公司](https://appshunter.io/developer/1638728786) | [祖策 谢](https://appshunter.io/developer/983519195) |

## What reviewers say

### Advancer AD20

[App page](https://appshunter.io/ios/app/advancer-ad20/id6444664990)

This app connects to a smart OBD dongle to provide vehicle health checks, diagnosis, and real-time monitoring. It helps identify fault codes, analyze driving habits, and offers maintenance reminders for enhanced driving safety.

**Highlights:** OBD-II Diagnosis, In-depth system check, Live vehicle data monitoring, Maintenance light reset, Trip recorder, Driving habits analysis

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Easy installation and pairing
- 👍 Straightforward iPad pairing
- 👍 Full diagnostic capabilities
- 👍 Satisfied with results
- 👍 Works as expected for some users

**What reviewers complain about**

- 🐛 Cannot connect to device
- 🐛 Scanner tied to another account
- 🐛 Required account creation
- 🐛 Invalid email for account creation
- 🐛 Does not connect to specific car models

**Reported bugs**

- Cannot connect to scanner
- Scanner tied to another account
- Account creation issues (invalid email)
- Device stops working after registration
- Login timeouts

**Requested features**

- Add more languages, including Chinese
- Improve information availability for various car models
- Fix issues with iOS updates
- Improve app layout and navigation
- Increase text size and contrast


### KDIAG

[App page](https://appshunter.io/ios/app/kdiag/id6450169808)

This app offers comprehensive automotive fault detection and OBD functions for various car brands. It provides professional diagnostic services to quickly identify and resolve car issues, making driving safer and smoother for enthusiasts and professionals alike. The app supports 8 languages and is free to use.

**Highlights:** Comprehensive automotive fault detection, OBD functions, System fault diagnosis for mainstream brands, Free to use, Supports 8 languages, Professional diagnostic services

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

**In-app purchases:** none


## Frequently asked questions

### Is Advancer AD20 free?

Advancer AD20 is free to download, with no in-app purchases.

### Is KDIAG free?

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

### Which has better reviews, Advancer AD20 or KDIAG?

KDIAG is rated higher. Advancer AD20 averages 2.4 out of 5 from 64 ratings, while KDIAG averages 3.3 from 20 ratings.

### Do Advancer AD20 or KDIAG have ads?

Neither Advancer AD20 nor KDIAG shows ads.

### Which is updated more often, Advancer AD20 or KDIAG?

Advancer AD20 ships an update monthly, and KDIAG fortnightly. Most recently, Advancer AD20 was updated on October 23, 2026 and KDIAG 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.*