# Protractor Edge vs Zing Alarm

The clearest difference is in-app purchases: Zing Alarm at none against Protractor Edge's 2. Zing Alarm also leads on ads (none vs shown). Protractor Edge's advantage is device support (3 vs 1) and iOS requirement (9.0 vs 26.0). On price there is nothing between them.

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

## The numbers

| Metric | Protractor Edge | Zing Alarm |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (55 ratings)](https://appshunter.io/ios/app/protractor-edge-clinometer/id1198499762/reviews)** | — |
| Number of ratings | **55** | — |
| Positive reviews | 69.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 43 months | — |
| Monetization | Freemium | — |
| Size | 21 MB | 5 MB |
| Requires iOS | **9.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [嵩 张](https://appshunter.io/developer/1091921941) | [Luyao Tang](https://appshunter.io/developer/6809298410) |

## 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 |


### Zing Alarm

[App page](https://appshunter.io/ios/app/zing-alarm/id6809298408)

**In-app purchases:** none


## Frequently asked questions

### Is Protractor Edge free?

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

### Is Zing Alarm free?

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

### Do Protractor Edge or Zing Alarm have ads?

Protractor Edge shows ads; Zing Alarm does not.

---

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