# Protractor Edge vs Bubble Level AI

The clearest difference is rating: Bubble Level AI at 5.0 against Protractor Edge's 4.0. Bubble Level AI also leads on ads (none vs shown) and review sentiment (100% vs 67%). Protractor Edge's advantage is iOS requirement (13.0 vs 18.0). On price, ratings volume, update cadence and in-app purchases there is nothing between them.

Both are free to download. Protractor Edge sells 2 one-off in-app purchases and Bubble Level AI sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Bubble Level AI holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 2 and 4 respectively. Written reviews point the same way: 67% of Protractor Edge's written reviews are positive against 100% of Bubble Level AI's.

Protractor Edge ships an update every 6 weeks, Bubble Level AI every 2 months. The most recent releases landed on October 7, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Protractor Edge | Bubble Level AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (2 ratings)](https://appshunter.io/ios/app/protractor-edge-angle-measure/id1499078532/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/bubble-level-ai-phone-leveler/id6772351219/reviews)** |
| Number of ratings | 2 | **4** |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 17 MB | 6 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | +4 | 4+ |
| Developer | [向阳 杨](https://appshunter.io/developer/1174757734) | [Kirby Salter](https://appshunter.io/developer/1896698913) |

## 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 |


### Bubble Level AI

[App page](https://appshunter.io/ios/app/bubble-level-ai-phone-leveler/id6772351219)

This app transforms your device into a high-precision measurement tool for levels, surfaces, and angles. It offers real-time sensor data, voice guidance for hands-free operation, and camera integration for easy setup. Advanced features and unlimited history are available via an in-app purchase.

**Highlights:** Multi-mode measurements (Level, Surface, Angle), Live motion sensor data, Voice guidance for hands-free use, Camera integration for measurement grids, Orientation lock and calibration, Data export (text, CSV), Offline functionality

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $0.99 | per month |
| Lifetime Premium Access | $4.99 | one-time |


## Frequently asked questions

### Is Protractor Edge free?

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

### Is Bubble Level AI free?

Bubble Level AI is free to download, with in-app purchases available.

### Which has better reviews, Protractor Edge or Bubble Level AI?

Bubble Level AI is rated higher. Protractor Edge averages 4.0 out of 5 from 2 ratings, while Bubble Level AI averages 5.0 from 4 ratings.

### Do Protractor Edge or Bubble Level AI have ads?

Protractor Edge shows ads; Bubble Level AI does not.

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

Protractor Edge ships an update every 6 weeks, and Bubble Level AI every 2 months. Most recently, Protractor Edge was updated on October 7, 2026 and Bubble Level AI on October 24, 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.*