# Virtual Flange Slide Rule vs Workstrings

The clearest difference is update cadence: Workstrings at every 8 days against Virtual Flange Slide Rule's every 4 months. Workstrings also leads on iOS requirement (13.0 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 Workstrings. Both are backed by a comparable volume of ratings — 13 and 14 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Virtual Flange Slide Rule ships an update every 4 months, Workstrings every 8 days. The most recent releases landed on September 14, 2026 and June 10, 2026 respectively.

## The numbers

| Metric | Virtual Flange Slide Rule | Workstrings |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (13 ratings)](https://appshunter.io/ios/app/virtual-flange-slide-rule/id546358145/reviews) | [5.0 (14 ratings)](https://appshunter.io/ios/app/workstrings/id6740924535/reviews) |
| Number of ratings | 13 | **14** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 8 days** |
| Monetization | Free | Free |
| Size | 3 MB | 135 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [American Certified Equipment, Inc.](https://appshunter.io/developer/546358148) | [SESI Holdings, Inc.](https://appshunter.io/developer/1777501957) |

## 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


### Workstrings

[App page](https://appshunter.io/ios/app/workstrings/id6740924535)

Access and share detailed product specifications for a wide range of tubular goods and specialized joints. Easily search, view, and download spec sheets for items like drill pipe, landing string, and drill collars.

**Highlights:** Search product specifications, View detailed spec sheets, Download specification documents, Share product information, Browse tubular goods, Access Worktech Joints specs

**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 Workstrings free?

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

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

Virtual Flange Slide Rule and Workstrings are both rated 5.0 out of 5 on the App Store, from 13 and 14 ratings respectively.

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

Neither Virtual Flange Slide Rule nor Workstrings shows ads.

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

Virtual Flange Slide Rule ships an update every 4 months, and Workstrings every 8 days. Most recently, Virtual Flange Slide Rule was updated on September 14, 2026 and Workstrings on June 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.*