# SmartOBD vs J1939OBD

The clearest difference is in-app purchases: SmartOBD at none against J1939OBD's 1. SmartOBD also leads on update cadence (every 4 months vs every 41 months) and iOS requirement (9.0 vs 12.1). On price, ads and device support there is nothing between them.

Both are free to download. J1939OBD sells 1 one-off in-app purchase. SmartOBD asks for nothing beyond the download.

SmartOBD ships an update every 4 months, J1939OBD every 41 months. The most recent releases landed on October 4, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | SmartOBD | J1939OBD |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 41 months |
| Size | 22 MB | 14 MB |
| Requires iOS | **9.0** | 12.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ginception Software Ltd](https://appshunter.io/developer/632518159) | [S.Koepge](https://appshunter.io/developer/340731168) |

## What reviewers say

### SmartOBD

[App page](https://appshunter.io/ios/app/smartobd-ii/id1089377396)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is SmartOBD free?

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

### Is J1939OBD free?

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

### Do SmartOBD or J1939OBD have ads?

Neither SmartOBD nor J1939OBD shows ads.

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

SmartOBD ships an update every 4 months, and J1939OBD every 41 months. Most recently, SmartOBD was updated on October 4, 2026 and J1939OBD on September 18, 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.*