# J1939OBD vs SCA LMS

The clearest difference is in-app purchases: SCA LMS at none against J1939OBD's 1. SCA LMS also leads on update cadence (every 3 weeks vs every 41 months). J1939OBD's advantage is iOS requirement (12.1 vs 15.0). On price, ads and device support there is nothing between them.

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

J1939OBD ships an update every 41 months, SCA LMS every 3 weeks. The most recent releases landed on September 18, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | J1939OBD | SCA LMS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 41 months | **Every 3 weeks** |
| Size | 14 MB | 30 MB |
| Requires iOS | **12.1** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [S.Koepge](https://appshunter.io/developer/340731168) | [Vannak Seng](https://appshunter.io/developer/1676953357) |

## 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 |


### SCA LMS

[App page](https://appshunter.io/ios/app/sca-lms/id6747097106)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is J1939OBD free?

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

### Is SCA LMS free?

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

### Do J1939OBD or SCA LMS have ads?

Neither J1939OBD nor SCA LMS shows ads.

### Which is updated more often, J1939OBD or SCA LMS?

J1939OBD ships an update every 41 months, and SCA LMS every 3 weeks. Most recently, J1939OBD was updated on September 18, 2026 and SCA LMS on October 9, 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.*