# Giotto ScanTool vs Gretio

The clearest difference is rating: Gretio at 3.8 against Giotto ScanTool's 3.3. Gretio also leads on review sentiment (68% vs 31%) and update cadence (monthly vs every 3 months). Giotto ScanTool's advantage is in-app purchases (none vs 4) and iOS requirement (14.0 vs 18.0). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. Gretio sells 4 in-app purchases, starting at $19.99 per year. Giotto ScanTool asks for nothing beyond the download.

Gretio holds the better App Store score, 3.8 against 3.3. Both are backed by a comparable volume of ratings — 44 and 23 respectively. Written reviews point the same way: 31% of Giotto ScanTool's written reviews are positive against 68% of Gretio's.

Giotto ScanTool ships an update every 3 months, Gretio monthly. The most recent releases landed on October 24, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Giotto ScanTool | Gretio |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.3 (44 ratings)](https://appshunter.io/ios/app/giotto-scantool/id1294503417/reviews) | **[3.8 (23 ratings)](https://appshunter.io/ios/app/gretio/id1498320180/reviews)** |
| Number of ratings | **44** | 23 |
| Positive reviews | 30.8% of reviews | **68.4% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 912 MB | 40 MB |
| Requires iOS | **14.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [AutoEnginuity](https://appshunter.io/developer/1294503416) | [Surreal Development LLC](https://appshunter.io/developer/1498320179) |

## What reviewers say

### Giotto ScanTool

[App page](https://appshunter.io/ios/app/giotto-scantool/id1294503417)

This professional-grade automotive diagnostic tool provides extensive vehicle coverage and deep system access. It helps repair shops and fleet managers quickly service a wide range of vehicles with features like live data, bi-directional controls, and DTC reporting.

**Highlights:** Professional-grade enhanced coverage, Access to ABS, airbag, powertrain, and more, Live data and bi-directional controls, Adaptive resets and learns, DTC report output (XML/PDF), Graphing with pan and zoom, WIFI connectivity

**Features:** macOS Compatibility

**In-app purchases:** none


### Gretio

[App page](https://appshunter.io/ios/app/gretio/id1498320180)

This app enables advanced vehicle diagnostics and service functions for General Motors vehicles using an OBDLINK MX+ device. It analyzes data points, looks up trouble codes, and performs service procedures like DPF regenerations.

**Highlights:** Advanced diagnostic functions, Analyze thousands of data points, Look up diagnostic trouble codes, Perform advanced service functions, Exclusive for General Motors vehicles

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gretio All Access | $19.99 | per year |
| Gretio RPO Pack 1 | $34.99 | one-time |
| Gretio RPO Pack 2 | $34.99 | one-time |
| RPO Pack 3 | $34.99 | one-time |


## Frequently asked questions

### Is Giotto ScanTool free?

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

### Is Gretio free?

Gretio is free to download, with in-app purchases available.

### Which has better reviews, Giotto ScanTool or Gretio?

Gretio is rated higher. Giotto ScanTool averages 3.3 out of 5 from 44 ratings, while Gretio averages 3.8 from 23 ratings.

### Do Giotto ScanTool or Gretio have ads?

Neither Giotto ScanTool nor Gretio shows ads.

### Which is updated more often, Giotto ScanTool or Gretio?

Giotto ScanTool ships an update every 3 months, and Gretio monthly. Most recently, Giotto ScanTool was updated on October 24, 2026 and Gretio on October 29, 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.*