# J1939OBD vs Gretio

The clearest difference is update cadence: Gretio at every 3 weeks against J1939OBD's every 41 months. J1939OBD's advantage is iOS requirement (12.1 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. J1939OBD sells 1 one-off in-app purchase and Gretio sells 4 in-app purchases, starting at $19.99 per year. Whichever you choose, the download price is not the number that matters.

J1939OBD ships an update every 41 months, Gretio every 3 weeks. The most recent releases landed on May 17, 2026 and August 15, 2026 respectively.

## The numbers

| Metric | J1939OBD | Gretio |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.9 (22 ratings)](https://appshunter.io/ios/app/gretio/id1498320180/reviews)** |
| Number of ratings | — | **22** |
| Positive reviews | — | 72.2% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 41 months | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 14 MB | 40 MB |
| Requires iOS | **12.1** | 18.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [S.Koepge](https://appshunter.io/developer/340731168) | [Surreal Development LLC](https://appshunter.io/developer/1498320179) |

## What reviewers say

### J1939OBD

[App page](https://appshunter.io/ios/app/j1939obd/id1453435912)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Get full access for 1939OBD | $3.99 | one-time |


### 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 | $29.99 | one-time |
| Gretio RPO Pack 2 | $29.99 | one-time |
| RPO Pack 3 | $29.99 | one-time |


## Frequently asked questions

### Is J1939OBD free?

J1939OBD is free to download, with in-app purchases available.

### Is Gretio free?

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

### Do J1939OBD or Gretio have ads?

Neither J1939OBD nor Gretio shows ads.

### Which is updated more often, J1939OBD or Gretio?

J1939OBD ships an update every 41 months, and Gretio every 3 weeks. Most recently, J1939OBD was updated on May 17, 2026 and Gretio on August 15, 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.*