# Protractor Edge vs Stub Acme and Buttress threads

The clearest difference is price: Protractor Edge at Free against Stub Acme and Buttress threads's $9.99. Protractor Edge also leads on ratings volume (55 vs 2) and iOS requirement (9.0 vs 14.0). Stub Acme and Buttress threads's advantage is rating (5.0 vs 4.5) and in-app purchases (none vs 2). On update cadence and device support there is nothing between them.

Protractor Edge is free to download; Stub Acme and Buttress threads costs $9.99 up front. Protractor Edge sells 2 in-app purchases, starting at $1.99 per year. Stub Acme and Buttress threads asks for nothing beyond the download.

Stub Acme and Buttress threads holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Protractor Edge has 55 ratings behind it against 2, so its average is the more settled of the two.

Protractor Edge ships an update every 43 months, Stub Acme and Buttress threads every 39 months. The most recent releases landed on November 11, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Protractor Edge | Stub Acme and Buttress threads |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | [4.5 (55 ratings)](https://appshunter.io/ios/app/protractor-edge-clinometer/id1198499762/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/stub-acme-and-buttress-threads/id1665818464/reviews)** |
| Number of ratings | **55** | 2 |
| Positive reviews | 69.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 43 months | **Every 39 months** |
| Monetization | **Freemium** | Paid |
| Size | 21 MB | 47 MB |
| Requires iOS | **9.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [嵩 张](https://appshunter.io/developer/1091921941) | [Greater Bear Inc.](https://appshunter.io/developer/1661706045) |

## What reviewers say

### Protractor Edge

[App page](https://appshunter.io/ios/app/protractor-edge-clinometer/id1198499762)

Measure angles directly on your device without taking photos or placing the angle on screen. This app offers a unique and efficient way to determine degrees, saving you time with its handy assistant functionality.

**Highlights:** Direct angle measurement on device, Intuitive line dragging interface, Measures angles in photos (Premium), Measures from camera view (Premium), Ad-free experience (Premium)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Access | $1.99 | per year |
| Remove Ads | $0.99 | one-time |


### Stub Acme and Buttress threads

[App page](https://appshunter.io/ios/app/stub-acme-and-buttress-threads/id1665818464)

This application calculates all necessary dimensions for Acme, Stub Acme, and Buttress threads based on industry standards. It provides precise measurements for thread profiles, including major, minor, and pitch diameters, and offers an alternative method for checking pitch diameter without specialized micrometers.

**Highlights:** Calculates Acme, Stub Acme, and Buttress thread dimensions, Supports standard and custom thread types, Provides major, minor, and pitch diameter calculations, Offers overwrite measuring number for pitch diameter, Precision guaranteed, Follows ASME/ANSI standards

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Protractor Edge free?

Protractor Edge is free to download, with in-app purchases available.

### Is Stub Acme and Buttress threads free?

Stub Acme and Buttress threads costs $9.99, with no in-app purchases.

### Which has better reviews, Protractor Edge or Stub Acme and Buttress threads?

Stub Acme and Buttress threads is rated higher. Protractor Edge averages 4.5 out of 5 from 55 ratings, while Stub Acme and Buttress threads averages 5.0 from 2 ratings.

### Do Protractor Edge or Stub Acme and Buttress threads have ads?

Protractor Edge shows ads; Stub Acme and Buttress threads does not.

### Which is updated more often, Protractor Edge or Stub Acme and Buttress threads?

Protractor Edge ships an update every 43 months, and Stub Acme and Buttress threads every 39 months. Most recently, Protractor Edge was updated on November 11, 2026 and Stub Acme and Buttress threads on November 3, 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.*