# iEngineer vs Dozuki

The clearest difference is review sentiment: iEngineer at 86% against Dozuki's 25%. iEngineer also leads on ratings volume (200 vs 1). Dozuki's advantage is in-app purchases (none vs 1) and rating (5.0 vs 4.6). On price, ads and device support there is nothing between them.

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

Dozuki 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 25% of Dozuki'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, Dozuki every 2 weeks. The most recent releases landed on October 29, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | iEngineer | Dozuki |
| --- | --- | --- |
| 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/dozuki/id517173580/reviews)** |
| Number of ratings | **200** | 1 |
| Positive reviews | **85.5% of reviews** | 25.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 12 MB | 72 MB |
| Requires iOS | 26.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Perfectly Simple Apps LLC](https://appshunter.io/developer/357604157) | [Dozuki](https://appshunter.io/developer/517173583) |

## 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


### Dozuki

[App page](https://appshunter.io/ios/app/dozuki/id517173580)

This app digitizes standard operating procedures and training materials for frontline workers. It ensures access to the latest versions, facilitates onboarding and retraining, and captures process data for continuous improvement and quality management.

**Highlights:** Digital work instructions, Frontline worker training, Continuous improvement feedback, Quality data collection, Version control for procedures, Electronic sign-offs

**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 Dozuki free?

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

### Which has better reviews, iEngineer or Dozuki?

Dozuki is rated higher. iEngineer averages 4.6 out of 5 from 200 ratings, while Dozuki averages 5.0 from 1 ratings.

### Do iEngineer or Dozuki have ads?

Neither iEngineer nor Dozuki shows ads.

### Which is updated more often, iEngineer or Dozuki?

iEngineer ships an update every 5 months, and Dozuki every 2 weeks. Most recently, iEngineer was updated on October 29, 2026 and Dozuki on October 10, 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.*