# Dozuki vs Virtual Flange Slide Rule

Dozuki and Virtual Flange Slide Rule both sit at 5.0 stars, but that hides the real split: 100% of Virtual Flange Slide Rule's written reviews are positive against 25% of Dozuki's. Virtual Flange Slide Rule also leads on ratings volume (13 vs 1). Dozuki's advantage is update cadence (every 2 weeks vs every 4 months). On price, rating, 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.

On the App Store both sit at effectively the same score — 5.0 for Dozuki against 5.0 for Virtual Flange Slide Rule. That said, the two scores are not equally well evidenced: Virtual Flange Slide Rule has 13 ratings behind it against 1, so its average is the more settled of the two. Written reviews are what separate them: 25% of Dozuki's written reviews are positive against 100% of Virtual Flange Slide Rule's.

Dozuki ships an update every 2 weeks, Virtual Flange Slide Rule every 4 months. The most recent releases landed on October 10, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | Dozuki | Virtual Flange Slide Rule |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/dozuki/id517173580/reviews) | [5.0 (13 ratings)](https://appshunter.io/ios/app/virtual-flange-slide-rule/id546358145/reviews) |
| Number of ratings | 1 | **13** |
| Positive reviews | 25.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 4 months |
| Monetization | Free | Free |
| Size | 72 MB | 3 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Dozuki](https://appshunter.io/developer/517173583) | [American Certified Equipment, Inc.](https://appshunter.io/developer/546358148) |

## What reviewers say

### 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


### Virtual Flange Slide Rule

[App page](https://appshunter.io/ios/app/virtual-flange-slide-rule/id546358145)

Access essential measurements and dimensional data for API 6A integral flanges. This tool provides quick access to critical specifications for engineering and industrial applications.

**Highlights:** API 6A integral flange data, Relevant measurements, Dimensional data access, Engineering specifications

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Dozuki free?

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

### Is Virtual Flange Slide Rule free?

Virtual Flange Slide Rule is free to download, with no in-app purchases.

### Which has better reviews, Dozuki or Virtual Flange Slide Rule?

Dozuki and Virtual Flange Slide Rule are both rated 5.0 out of 5 on the App Store, from 1 and 13 ratings respectively.

### Do Dozuki or Virtual Flange Slide Rule have ads?

Neither Dozuki nor Virtual Flange Slide Rule shows ads.

### Which is updated more often, Dozuki or Virtual Flange Slide Rule?

Dozuki ships an update every 2 weeks, and Virtual Flange Slide Rule every 4 months. Most recently, Dozuki was updated on October 10, 2026 and Virtual Flange Slide Rule 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.*