# FuelTech Datalog Viewer vs Vantage Logon

The clearest difference is iOS requirement: FuelTech Datalog Viewer at 9.3 against Vantage Logon's 15.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

FuelTech Datalog Viewer ships an update every 9 months, Vantage Logon every 11 months. The most recent releases landed on October 26, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | FuelTech Datalog Viewer | Vantage Logon |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (4 ratings)](https://appshunter.io/ios/app/fueltech-datalog-viewer/id1303811774/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 40.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 9 months** | Every 11 months |
| Monetization | Free | — |
| Size | 168 MB | 79 MB |
| Requires iOS | **9.3** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [FuelTech](https://appshunter.io/developer/519474170) | [Thames Valley Controls Limited](https://appshunter.io/developer/1560969534) |

## What reviewers say

### FuelTech Datalog Viewer

[App page](https://appshunter.io/ios/app/fueltech-datalog-viewer/id1303811774)

Analyze engine data logs from compatible FuelTech ECUs on your mobile device. View up to four channels simultaneously for quick data analysis and check status events for errors. Log files must be transferred to the device manually.

**Highlights:** View up to 4 recorded channels simultaneously, Quick data analysis, Check status events for errors, Supports FT450, FT500, FT500LITE, FT550, FT550LITE, FT600 models, Log file viewer for phone/tablet

**Features:** macOS Compatibility

**In-app purchases:** none


### Vantage Logon

[App page](https://appshunter.io/ios/app/vantage-logon/id1596918212)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is FuelTech Datalog Viewer free?

FuelTech Datalog Viewer is free to download, with no in-app purchases.

### Is Vantage Logon free?

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

### Do FuelTech Datalog Viewer or Vantage Logon have ads?

Neither FuelTech Datalog Viewer nor Vantage Logon shows ads.

### Which is updated more often, FuelTech Datalog Viewer or Vantage Logon?

FuelTech Datalog Viewer ships an update every 9 months, and Vantage Logon every 11 months. Most recently, FuelTech Datalog Viewer was updated on October 26, 2026 and Vantage Logon on October 1, 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.*