# OnTrack vs VMH Flex J1939

The clearest difference is in-app purchases: VMH Flex J1939 at none against OnTrack's 2. VMH Flex J1939 also leads on iOS requirement (15.0 vs 17.2). OnTrack's advantage is update cadence (every 2 weeks vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. OnTrack sells 2 in-app purchases, starting at $1.99 per month. VMH Flex J1939 asks for nothing beyond the download.

OnTrack ships an update every 2 weeks, VMH Flex J1939 every 2 months. The most recent releases landed on October 9, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | OnTrack | VMH Flex J1939 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 2 months |
| Size | 8 MB | 4 MB |
| Requires iOS | 17.2 | **15.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | +4 | 4+ |
| Developer | [OnTrack Apps Limited](https://appshunter.io/developer/1647551624) | [Veratron AG](https://appshunter.io/developer/1765346453) |

## What reviewers say

### OnTrack

[App page](https://appshunter.io/ios/app/ontrack-shift/id6478929008)

**Features:** Apple Watch app

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $1.99 | per month |
| Yearly - Best value | $19.99 | per year |


### VMH Flex J1939

[App page](https://appshunter.io/ios/app/vmh-flex-j1939/id6742135922)

**In-app purchases:** none


## Frequently asked questions

### Is OnTrack free?

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

### Is VMH Flex J1939 free?

VMH Flex J1939 is free to download, with no in-app purchases.

### Do OnTrack or VMH Flex J1939 have ads?

Neither OnTrack nor VMH Flex J1939 shows ads.

### Which is updated more often, OnTrack or VMH Flex J1939?

OnTrack ships an update every 2 weeks, and VMH Flex J1939 every 2 months. Most recently, OnTrack was updated on October 9, 2026 and VMH Flex J1939 on October 17, 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.*