# Protractor Edge vs Watchio AI

The clearest difference is in-app purchases: Watchio AI at none against Protractor Edge's 2. Watchio AI also leads on ads (none vs shown) and update cadence (every 4 days vs every 6 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Protractor Edge sells 2 one-off in-app purchases. Watchio AI asks for nothing beyond the download.

Protractor Edge ships an update every 6 weeks, Watchio AI every 4 days. The most recent releases landed on October 7, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Protractor Edge | Watchio AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (2 ratings)](https://appshunter.io/ios/app/protractor-edge-angle-measure/id1499078532/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 6 weeks | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 17 MB | 33 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | +4 | 4+ |
| Developer | [向阳 杨](https://appshunter.io/developer/1174757734) | [TRANWO TECHNOLOGY CORP.](https://appshunter.io/developer/595251459) |

## What reviewers say

### Protractor Edge

[App page](https://appshunter.io/ios/app/protractor-edge-angle-measure/id1499078532)

This utility app functions as a precise digital protractor for measuring angles on your device. It offers a smart instrument for accurate angle measurement, supporting iPhone and iPad. The app is free to download and use.

**Highlights:** Precise angle measurement, Smart instrument, Digital protractor, Supports iPhone and iPad

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Support for a cup of coffee | $1.99 | one-time |
| Ads-free experience | $1.99 | one-time |


### Watchio AI

[App page](https://appshunter.io/ios/app/watchio-ai/id6752840867)

**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 Watchio AI free?

Watchio AI is free to download, with no in-app purchases.

### Do Protractor Edge or Watchio AI have ads?

Protractor Edge shows ads; Watchio AI does not.

### Which is updated more often, Protractor Edge or Watchio AI?

Protractor Edge ships an update every 6 weeks, and Watchio AI every 4 days. Most recently, Protractor Edge was updated on October 7, 2026 and Watchio AI on October 25, 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.*