# Virtual Flange Slide Rule vs Quail Tools

The clearest difference is update cadence: Quail Tools at every 5 weeks against Virtual Flange Slide Rule's every 4 months. Quail Tools also leads on iOS requirement (12.0 vs 15.0). On price, rating, review sentiment and ratings volume 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 Quail Tools. Both are backed by a comparable volume of ratings — 13 and 22 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Virtual Flange Slide Rule ships an update every 4 months, Quail Tools every 5 weeks. The most recent releases landed on October 23, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Virtual Flange Slide Rule | Quail Tools |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (13 ratings)](https://appshunter.io/ios/app/virtual-flange-slide-rule/id546358145/reviews) | [5.0 (22 ratings)](https://appshunter.io/ios/app/quail-tools/id1279372123/reviews) |
| Number of ratings | 13 | **22** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 5 weeks** |
| Monetization | Free | Free |
| Size | 3 MB | 50 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [American Certified Equipment, Inc.](https://appshunter.io/developer/546358148) | [Austin Angelle](https://appshunter.io/developer/1801766276) |

## 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


### Quail Tools

[App page](https://appshunter.io/ios/app/quail-tools/id1279372123)

Access essential specifications for Tubulars, BOPs, and API Casing offline. View detailed data like tool joint OD, make-up torque, and pressure ratings. Share spec sheets when an internet connection is available.

**Highlights:** Offline access to Tubular and BOP specs, API Casing General Information table, Detailed spec sheets for equipment, Shareable spec sheets (online), Save spec sheets to device, Tool joint OD, ID, torque, tensile, BOP pressure rating, bonnet type, operating data

**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 Quail Tools free?

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

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

Virtual Flange Slide Rule and Quail Tools are both rated 5.0 out of 5 on the App Store, from 13 and 22 ratings respectively.

### Do Virtual Flange Slide Rule or Quail Tools have ads?

Neither Virtual Flange Slide Rule nor Quail Tools shows ads.

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

Virtual Flange Slide Rule ships an update every 4 months, and Quail Tools every 5 weeks. Most recently, Virtual Flange Slide Rule was updated on October 23, 2026 and Quail Tools on October 21, 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.*