# Protractor Edge vs ION UPS IoT

The clearest difference is in-app purchases: ION UPS IoT at none against Protractor Edge's 2. ION UPS IoT also leads on ads (none vs shown) and update cadence (every 6 weeks vs every 43 months). Protractor Edge's advantage is iOS requirement (9.0 vs 15.1). On price 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. ION UPS IoT asks for nothing beyond the download.

Protractor Edge ships an update every 43 months, ION UPS IoT every 6 weeks. The most recent releases landed on October 27, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Protractor Edge | ION UPS IoT |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (94 ratings)](https://appshunter.io/ios/app/protractor-edge-clinometer/id1198499762/reviews)** | — |
| Number of ratings | **94** | — |
| Positive reviews | 69.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 43 months | **Every 6 weeks** |
| Monetization | Freemium | — |
| Size | 21 MB | 20 MB |
| Requires iOS | **9.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [嵩 张](https://appshunter.io/developer/1091921941) | [Adem Kalan](https://appshunter.io/developer/1860445041) |

## 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 |


### ION UPS IoT

[App page](https://appshunter.io/ios/app/ion-ups-iot/id6756394619)

**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 ION UPS IoT free?

ION UPS IoT is free to download, with no in-app purchases.

### Do Protractor Edge or ION UPS IoT have ads?

Protractor Edge shows ads; ION UPS IoT does not.

### Which is updated more often, Protractor Edge or ION UPS IoT?

Protractor Edge ships an update every 43 months, and ION UPS IoT every 6 weeks. Most recently, Protractor Edge was updated on October 27, 2026 and ION UPS IoT on October 2, 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.*