# Protractor Edge vs Bubble Level + Spirit Level

Protractor Edge and Bubble Level + Spirit Level both sit at 4.5 stars, but that hides the real split: 100% of Bubble Level + Spirit Level's written reviews are positive against 70% of Protractor Edge's. Bubble Level + Spirit Level also leads on update cadence (fortnightly vs every 43 months). Protractor Edge's advantage is iOS requirement (9.0 vs 16.6). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Protractor Edge sells 2 in-app purchases, starting at $1.99 per year and Bubble Level + Spirit Level sells 7 in-app purchases, starting at $0.99 per 7 days. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.5 for Protractor Edge against 4.4 for Bubble Level + Spirit Level. Both are backed by a comparable volume of ratings — 55 and 35 respectively. Written reviews are what separate them: 70% of Protractor Edge's written reviews are positive against 100% of Bubble Level + Spirit Level's.

Protractor Edge ships an update every 43 months, Bubble Level + Spirit Level fortnightly. The most recent releases landed on October 16, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Protractor Edge | Bubble Level + Spirit Level |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (55 ratings)](https://appshunter.io/ios/app/protractor-edge-clinometer/id1198499762/reviews)** | [4.4 (35 ratings)](https://appshunter.io/ios/app/bubble-level-plus-spirit-level/id1547834136/reviews) |
| Number of ratings | **55** | 35 |
| Positive reviews | 69.6% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 43 months | **Fortnightly** |
| Monetization | Freemium | Free with in-app purchases |
| Size | 21 MB | 38 MB |
| Requires iOS | **9.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [嵩 张](https://appshunter.io/developer/1091921941) | [Jens Rieckhof](https://appshunter.io/developer/354266124) |

## 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 |


### Bubble Level + Spirit Level

[App page](https://appshunter.io/ios/app/bubble-level-plus-spirit-level/id1547834136)

Transform your smartphone into a precise measuring tool. This application offers two modes for accurately leveling surfaces or measuring angles, with calibration made simple. It's ideal for tasks like hanging pictures, checking table levels, or calculating roof pitches.

**Highlights:** Bubble level and spirit level modes, Accurate to one tenth of a degree, Easy calibration, Camera support, Multiple color schemes, Angle and slope measurement

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Bubble Level - Weekly | $0.99 | per 7 days |
| Bubble Level - Weekly | $1.99 | per 7 days |
| Bubble Level - Annual | $6.99 | per year |
| Bubble Level - Annual | $8.99 | per year |
| Bubble Level - Lifetime Discount | $9.99 | one-time |
| Bubble Level - Lifetime Premium | $12.99 | one-time |
| Bubble Level - Lifetime | $19.99 | one-time |


## Frequently asked questions

### Is Protractor Edge free?

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

### Is Bubble Level + Spirit Level free?

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

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

Protractor Edge is rated higher. Protractor Edge averages 4.5 out of 5 from 55 ratings, while Bubble Level + Spirit Level averages 4.4 from 35 ratings.

### Do Protractor Edge or Bubble Level + Spirit Level have ads?

Both Protractor Edge and Bubble Level + Spirit Level show ads.

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

Protractor Edge ships an update every 43 months, and Bubble Level + Spirit Level fortnightly. Most recently, Protractor Edge was updated on October 16, 2026 and Bubble Level + Spirit Level on October 15, 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.*