# Virtual Flange Slide Rule vs PVF Reference

The clearest difference is ratings volume: Virtual Flange Slide Rule at 13 against PVF Reference's 2. PVF Reference's advantage is iOS requirement (8.0 vs 15.0). 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 Virtual Flange Slide Rule against 5.0 for PVF Reference. That said, the two scores are not equally well evidenced: Virtual Flange Slide Rule has 13 ratings behind it against 2, so its average is the more settled of the two.

## The numbers

| Metric | Virtual Flange Slide Rule | PVF Reference |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (13 ratings)](https://appshunter.io/ios/app/virtual-flange-slide-rule/id546358145/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/pvf-reference/id1244206014/reviews) |
| Number of ratings | **13** | 2 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | — |
| Monetization | Free | Free |
| Size | 3 MB | 47 MB |
| Requires iOS | 15.0 | **8.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [American Certified Equipment, Inc.](https://appshunter.io/developer/546358148) | [DistributionNOW](https://appshunter.io/developer/1227921553) |

## What reviewers say

### 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


### PVF Reference

[App page](https://appshunter.io/ios/app/pvf-reference/id1244206014)

Access industry standard terminology, specifications, and reference tables for pipe, valves, fittings, and fasteners. Quickly identify materials, understand markings, and find technical data with interactive tables and diagrams.

**Highlights:** Industry terminology glossary, Material identification diagrams, Technical data tables, Formula conversions, Manufacturing process diagrams, Industry standard marking explanations

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Virtual Flange Slide Rule free?

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

### Is PVF Reference free?

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

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

Virtual Flange Slide Rule and PVF Reference are both rated 5.0 out of 5 on the App Store, from 13 and 2 ratings respectively.

### Do Virtual Flange Slide Rule or PVF Reference have ads?

Neither Virtual Flange Slide Rule nor PVF Reference shows ads.

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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.*