# Virtual Flange Slide Rule vs Manta Ray Tracker

The clearest difference is rating: Virtual Flange Slide Rule at 5.0 against Manta Ray Tracker's 4.4. Virtual Flange Slide Rule also leads on review sentiment (100% vs 75%). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Virtual Flange Slide Rule holds the better App Store score, 5.0 against 4.4. Both are backed by a comparable volume of ratings — 13 and 5 respectively. Written reviews point the same way: 100% of Virtual Flange Slide Rule's written reviews are positive against 75% of Manta Ray Tracker's.

Virtual Flange Slide Rule ships an update every 4 months, Manta Ray Tracker every 3 months. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Virtual Flange Slide Rule | Manta Ray Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (13 ratings)](https://appshunter.io/ios/app/virtual-flange-slide-rule/id546358145/reviews)** | [4.4 (5 ratings)](https://appshunter.io/ios/app/manta-ray-tracker/id1191214032/reviews) |
| Number of ratings | **13** | 5 |
| Positive reviews | **100.0% of reviews** | 75.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 3 MB | 76 MB |
| Requires iOS | **15.0** | 16.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [American Certified Equipment, Inc.](https://appshunter.io/developer/546358148) | [More Mobile Software](https://appshunter.io/developer/323409493) |

## 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


### Manta Ray Tracker

[App page](https://appshunter.io/ios/app/manta-ray-tracker/id1191214032)

Discover and track individual manta rays in Kona, Hawaii. View photos, descriptions, and sighting history for over 300 cataloged rays. Contribute your own sightings to aid in research and conservation efforts.

**Highlights:** Catalog of over 300 identified manta rays, View photos and descriptions of individual rays, Track recent sightings and dive locations, Contribute your own manta ray photos and sightings, Offline sighting creation, GPS and map integration for sighting location

**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 Manta Ray Tracker free?

Manta Ray Tracker is free to download, with no in-app purchases.

### Which has better reviews, Virtual Flange Slide Rule or Manta Ray Tracker?

Virtual Flange Slide Rule is rated higher. Virtual Flange Slide Rule averages 5.0 out of 5 from 13 ratings, while Manta Ray Tracker averages 4.4 from 5 ratings.

### Do Virtual Flange Slide Rule or Manta Ray Tracker have ads?

Neither Virtual Flange Slide Rule nor Manta Ray Tracker shows ads.

### Which is updated more often, Virtual Flange Slide Rule or Manta Ray Tracker?

Virtual Flange Slide Rule ships an update every 4 months, and Manta Ray Tracker every 3 months. Most recently, Virtual Flange Slide Rule was updated on November 1, 2026 and Manta Ray Tracker on November 6, 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.*