# Protractor Edge vs Trig Instruments Toolbox

The clearest difference is rating: Protractor Edge at 4.5 against Trig Instruments Toolbox's 2.6. Protractor Edge also leads on review sentiment (70% vs 50%) and ratings volume (55 vs 5). Trig Instruments Toolbox's advantage is in-app purchases (none vs 2) and ads (none vs shown). On price, update cadence and device support there is nothing between them.

Both are free to download. Protractor Edge sells 2 in-app purchases, starting at $1.99 per year. Trig Instruments Toolbox asks for nothing beyond the download.

Protractor Edge holds the better App Store score, 4.5 against 2.6. That said, the two scores are not equally well evidenced: Protractor Edge has 55 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 70% of Protractor Edge's written reviews are positive against 50% of Trig Instruments Toolbox's.

Protractor Edge ships an update every 43 months, Trig Instruments Toolbox every 27 months. The most recent releases landed on October 16, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Protractor Edge | Trig Instruments Toolbox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (55 ratings)](https://appshunter.io/ios/app/protractor-edge-clinometer/id1198499762/reviews)** | [2.6 (5 ratings)](https://appshunter.io/ios/app/trig-instruments-toolbox/id1467103926/reviews) |
| Number of ratings | **55** | 5 |
| Positive reviews | **69.6% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 43 months | **Every 27 months** |
| Monetization | Freemium | **Free** |
| Size | 21 MB | 54 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [嵩 张](https://appshunter.io/developer/1091921941) | [Stevens Marketing Limited](https://appshunter.io/developer/1467103925) |

## 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 |


### Trig Instruments Toolbox

[App page](https://appshunter.io/ios/app/trig-instruments-toolbox/id1467103926)

This utility app provides a collection of essential field tools, including a ratio to angle converter, inclinometer, tally counter, and protractor. It leverages your device's sensors for accurate estimations and calculations, reducing the need to carry multiple physical instruments.

**Highlights:** Ratio to Angle converter, Inclinometer, Tally counter, Protractor, Uses device sensors for accuracy, New free tools added regularly

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Protractor Edge free?

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

### Is Trig Instruments Toolbox free?

Trig Instruments Toolbox is free to download, with no in-app purchases.

### Which has better reviews, Protractor Edge or Trig Instruments Toolbox?

Protractor Edge is rated higher. Protractor Edge averages 4.5 out of 5 from 55 ratings, while Trig Instruments Toolbox averages 2.6 from 5 ratings.

### Do Protractor Edge or Trig Instruments Toolbox have ads?

Protractor Edge shows ads; Trig Instruments Toolbox does not.

### Which is updated more often, Protractor Edge or Trig Instruments Toolbox?

Protractor Edge ships an update every 43 months, and Trig Instruments Toolbox every 27 months. Most recently, Protractor Edge was updated on October 16, 2026 and Trig Instruments Toolbox on October 7, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*