# iEngineer vs Technical Pocket Guide (STT)

The clearest difference is in-app purchases: Technical Pocket Guide (STT) at none against iEngineer's 1. Technical Pocket Guide (STT) also leads on rating (5.0 vs 4.6) and iOS requirement (17.0 vs 26.0). iEngineer's advantage is review sentiment (86% vs 55%) and ratings volume (200 vs 1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. iEngineer sells 1 one-off in-app purchase. Technical Pocket Guide (STT) asks for nothing beyond the download.

Technical Pocket Guide (STT) holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: iEngineer has 200 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 86% of iEngineer's written reviews are positive against 55% of Technical Pocket Guide (STT)'s, so the app with the better star average is not the one people write more warmly about.

iEngineer ships an update every 5 months, Technical Pocket Guide (STT) every 9 months. The most recent releases landed on October 29, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | iEngineer | Technical Pocket Guide (STT) |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (200 ratings)](https://appshunter.io/ios/app/iengineer/id369825047/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/technical-pocket-guide-stt/id426818450/reviews)** |
| Number of ratings | **200** | 1 |
| Positive reviews | **85.5% of reviews** | 55.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 9 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 12 MB | 55 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Perfectly Simple Apps LLC](https://appshunter.io/developer/357604157) | [Schaeffler Technologies GmbH & Co. KG](https://appshunter.io/developer/426470435) |

## 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


### Technical Pocket Guide (STT)

[App page](https://appshunter.io/ios/app/technical-pocket-guide-stt/id426818450)

This mobile reference guide offers essential technical knowledge for students, engineers, and technicians. It features a comprehensive search function, customizable bookmarks, and offline access, making it a convenient tool for daily work.

**Highlights:** Mobile technical reference, Full-text search, Table of contents with links, Customizable bookmarks and notes, Email content sharing, Offline functionality

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

**In-app purchases:** none


## Frequently asked questions

### Is iEngineer free?

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

### Is Technical Pocket Guide (STT) free?

Technical Pocket Guide (STT) is free to download, with no in-app purchases.

### Which has better reviews, iEngineer or Technical Pocket Guide (STT)?

Technical Pocket Guide (STT) is rated higher. iEngineer averages 4.6 out of 5 from 200 ratings, while Technical Pocket Guide (STT) averages 5.0 from 1 ratings.

### Do iEngineer or Technical Pocket Guide (STT) have ads?

Neither iEngineer nor Technical Pocket Guide (STT) shows ads.

### Which is updated more often, iEngineer or Technical Pocket Guide (STT)?

iEngineer ships an update every 5 months, and Technical Pocket Guide (STT) every 9 months. Most recently, iEngineer was updated on October 29, 2026 and Technical Pocket Guide (STT) on October 23, 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.*