# FuelTech Datalog Viewer vs Compression Calculator

The clearest difference is rating: FuelTech Datalog Viewer at 4.8 against Compression Calculator's 3.0. FuelTech Datalog Viewer also leads on review sentiment (40% vs 0%) and iOS requirement (9.3 vs 11.4). Compression Calculator's advantage is update cadence (every 9 days vs every 9 months). On price, ratings volume, 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 holds the better App Store score, 4.8 against 3.0. Both are backed by a comparable volume of ratings — 4 and 3 respectively. Written reviews point the same way: 40% of FuelTech Datalog Viewer's written reviews are positive against 0% of Compression Calculator's.

FuelTech Datalog Viewer ships an update every 9 months, Compression Calculator every 9 days. The most recent releases landed on October 5, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | FuelTech Datalog Viewer | Compression Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (4 ratings)](https://appshunter.io/ios/app/fueltech-datalog-viewer/id1303811774/reviews)** | [3.0 (3 ratings)](https://appshunter.io/ios/app/compression-calculator/id1421927149/reviews) |
| Number of ratings | **4** | 3 |
| Positive reviews | **40.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 9 days** |
| Monetization | Free | Free |
| Size | 168 MB | 10 MB |
| Requires iOS | **9.3** | 11.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [FuelTech](https://appshunter.io/developer/519474170) | [Peter Linszter](https://appshunter.io/developer/530077583) |

## 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


### Compression Calculator

[App page](https://appshunter.io/ios/app/compression-calculator/id1421927149)

Calculate engine compression, displacement, and piston speed using specific Honda engine parameters. Select engine components to get precise calculations for your automotive needs.

**Highlights:** Engine compression calculation, Displacement calculation, Piston speed calculation, Honda B, D, H/F, K-Series engine support, Component selection for custom calculations

**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 Compression Calculator free?

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

### Which has better reviews, FuelTech Datalog Viewer or Compression Calculator?

FuelTech Datalog Viewer is rated higher. FuelTech Datalog Viewer averages 4.8 out of 5 from 4 ratings, while Compression Calculator averages 3.0 from 3 ratings.

### Do FuelTech Datalog Viewer or Compression Calculator have ads?

Neither FuelTech Datalog Viewer nor Compression Calculator shows ads.

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

FuelTech Datalog Viewer ships an update every 9 months, and Compression Calculator every 9 days. Most recently, FuelTech Datalog Viewer was updated on October 5, 2026 and Compression Calculator on September 30, 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.*