# Ediag vs Sigeda Diffuser

The clearest difference is update cadence: Sigeda Diffuser at weekly against Ediag's every 2 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Ediag ships an update every 2 months, Sigeda Diffuser weekly. The most recent releases landed on October 11, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Ediag | Sigeda Diffuser |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (1.4K ratings)](https://appshunter.io/ios/app/ediag/id6444249245/reviews)** | — |
| Number of ratings | **1.4K** | — |
| Positive reviews | 29.6% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Free | — |
| Size | 455 MB | 28 MB |
| Requires iOS | 15.6 | **15.5** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Kingbolen Electrics Technology Co., Ltd.](https://appshunter.io/developer/1653350029) | [鸿燕 张](https://appshunter.io/developer/1820313433) |

## What reviewers say

### Ediag

[App page](https://appshunter.io/ios/app/ediag/id6444249245)

Perform comprehensive vehicle diagnostics, including reading data flow, fault codes, and vehicle information. Generate professional diagnostic reports for major automobile manufacturers. Features one-key diagnosis and automatic VIN reading.

**Highlights:** Full-function diagnosis, Read data flow, Read/clear fault code, Read vehicle information, Automatic VIN reading, Diagnostic reports

**In-app purchases:** none

**What reviewers like**

- ✅ Comprehensive diagnostic information and functionality
- 🎯 Works well for specific vehicle models (Chevy, Acura, etc.)
- 💪 Advanced features like glow plug programming and ECU coding
- 📱 Helpful AI and YouTube integration for guidance
- 🔧 Good value for price compared to expensive scan tools

**What reviewers complain about**

- 💰 Hidden subscription fees for special functions ($19.99 each)
- 🐛 App crashes frequently after updates
- ❌ Poor vehicle compatibility with newer models (2023+)
- 🔐 Requires location data and network connectivity
- 😕 Confusing user interface and unclear section titles

**Reported bugs**

- App crashes after latest update
- Activation fails with correct codes (used devices)
- Communication errors during diagnostics
- VIN finder doesn't work well for older cars
- First-day connection issues requiring account reset

**Requested features**

- Support for newer vehicle models (2023+)
- Better auto-identification for Ford and other manufacturers
- Language settings menu (Turkish language support mentioned)
- Ability to command multiple functions from same test screen
- Improved VIN finder for older vehicles (1990s-2000s)


### Sigeda Diffuser

[App page](https://appshunter.io/ios/app/sigeda-diffuser/id6775374601)

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

**In-app purchases:** none


## Frequently asked questions

### Is Ediag free?

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

### Is Sigeda Diffuser free?

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

### Do Ediag or Sigeda Diffuser have ads?

Neither Ediag nor Sigeda Diffuser shows ads.

### Which is updated more often, Ediag or Sigeda Diffuser?

Ediag ships an update every 2 months, and Sigeda Diffuser weekly. Most recently, Ediag was updated on October 11, 2026 and Sigeda Diffuser on October 1, 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.*