# FuelTech Datalog Viewer vs E

The clearest difference is rating: FuelTech Datalog Viewer at 4.8 against E's 4.0. FuelTech Datalog Viewer also leads on iOS requirement (9.3 vs 16.0). E's advantage is ratings volume (22 vs 4). On price, review sentiment, update cadence and ads 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 holds the better App Store score, 4.8 against 4.0. That said, the two scores are not equally well evidenced: E has 22 ratings behind it against 4, so its average is the more settled of the two. Written reviews complicate that: 40% of FuelTech Datalog Viewer's written reviews are positive against 45% of E's, so the app with the better star average is not the one people write more warmly about.

FuelTech Datalog Viewer ships an update every 9 months, E every 8 months. The most recent releases landed on June 5, 2026 and August 29, 2026 respectively.

## The numbers

| Metric | FuelTech Datalog Viewer | E |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (4 ratings)](https://appshunter.io/ios/app/fueltech-datalog-viewer/id1303811774/reviews)** | [4.0 (22 ratings)](https://appshunter.io/ios/app/e-tuner-4/id1579096205/reviews) |
| Number of ratings | 4 | **22** |
| Positive reviews | 40.0% of reviews | **45.5% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 8 months** |
| Monetization | Free | Free |
| Size | 168 MB | 50 MB |
| Requires iOS | **9.3** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [FuelTech](https://appshunter.io/developer/519474170) | [Edelbrock Corp](https://appshunter.io/developer/1579096297) |

## 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


### E

[App page](https://appshunter.io/ios/app/e-tuner-4/id1579096205)

This app connects wirelessly to an EFI system, allowing users to monitor engine data and adjust various settings like air-fuel ratios and ignition timing. It offers a setup wizard for initial calibration and advanced tuning options for performance optimization.

**Highlights:** Bluetooth ECU communication, Live tuning of ECU settings, Real-time engine and sensor data monitoring, Setup Wizard for base calibration, Advanced tuning functions, Diagnostic troubleshooting page, Vivid gauge displays

**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 E free?

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

### Which has better reviews, FuelTech Datalog Viewer or E?

FuelTech Datalog Viewer is rated higher. FuelTech Datalog Viewer averages 4.8 out of 5 from 4 ratings, while E averages 4.0 from 22 ratings.

### Do FuelTech Datalog Viewer or E have ads?

Neither FuelTech Datalog Viewer nor E shows ads.

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

FuelTech Datalog Viewer ships an update every 9 months, and E every 8 months. Most recently, FuelTech Datalog Viewer was updated on June 5, 2026 and E on August 29, 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.*