# iEngineer vs Tube Turns

iEngineer and Tube Turns both sit at 4.5 stars, but that hides the real split: 86% of iEngineer's written reviews are positive against 33% of Tube Turns's. iEngineer also leads on ratings volume (201 vs 4). Tube Turns's advantage is in-app purchases (none vs 1) and iOS requirement (18.6 vs 26.0). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. iEngineer sells 1 one-off in-app purchase. Tube Turns asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.5 for iEngineer against 4.5 for Tube Turns. That said, the two scores are not equally well evidenced: iEngineer has 201 ratings behind it against 4, so its average is the more settled of the two. Written reviews are what separate them: 86% of iEngineer's written reviews are positive against 33% of Tube Turns's.

iEngineer ships an update every 5 months, Tube Turns every 4 months. The most recent releases landed on November 1, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | iEngineer | Tube Turns |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (201 ratings)](https://appshunter.io/ios/app/iengineer/id369825047/reviews)** | [4.5 (4 ratings)](https://appshunter.io/ios/app/tube-turns/id1523547174/reviews) |
| Number of ratings | **201** | 4 |
| Positive reviews | **85.5% of reviews** | 33.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 4 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 12 MB | 57 MB |
| Requires iOS | 26.0 | **18.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Perfectly Simple Apps LLC](https://appshunter.io/developer/357604157) | [Aaron McCarthy](https://appshunter.io/developer/1523547176) |

## What reviewers say

### iEngineer

[App page](https://appshunter.io/ios/app/iengineer/id369825047)

Access a vast database of screw and bolt information, including dimensions, material grades, and strength properties for both US and metric fasteners. Features a comprehensive drill chart, unit conversion, and customizable material displays.

**Highlights:** Extensive US screw database, Metric screw database (in-app purchase), Detailed dimensions and material grades, Strength, torque, and clamp force data, Head markings and 3D head models, Comprehensive drill chart, Unit conversion and data export

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Metric Screws | $1.99 | one-time |

**What reviewers like**

- 🚀 Easy to navigate
- 👍 Comprehensive information
- 🔧 Useful for everyday work
- ⚙️ Essential for engineers and machinists
- 💡 Saves time compared to physical references

**What reviewers complain about**

- 🐛 Occasional errors in torque and tensile strength data
- 💰 Metric information requires paid upgrade
- 🔍 Missing some thread types like NPT and BSPP

**Reported bugs**

- Metric portion not working for some users
- Camera access request for no apparent reason

**Requested features**

- Add tap drill chart
- Include clearance hole fits
- Improve UI for larger displays
- Add French language support


### Tube Turns

[App page](https://appshunter.io/ios/app/tube-turns/id1523547174)

A mobile reference guide for pipe fitting, welding, and industrial piping. It provides instant access to essential formulas, conversion tables, technical specifications, and industry standards for professionals in the oil & gas and petrochemical sectors.

**Highlights:** Technical reference library, Formulas and conversion tools, Welding specifications, Material properties database, Searchable glossary, Offline functionality

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iEngineer free?

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

### Is Tube Turns free?

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

### Which has better reviews, iEngineer or Tube Turns?

iEngineer is rated higher. iEngineer averages 4.5 out of 5 from 201 ratings, while Tube Turns averages 4.5 from 4 ratings.

### Do iEngineer or Tube Turns have ads?

Neither iEngineer nor Tube Turns shows ads.

### Which is updated more often, iEngineer or Tube Turns?

iEngineer ships an update every 5 months, and Tube Turns every 4 months. Most recently, iEngineer was updated on November 1, 2026 and Tube Turns on October 11, 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.*