# Protractor Smart vs Bubble Level Tool

The clearest difference is monetization model: Protractor Smart at free with in-app purchases against Bubble Level Tool's subscription. Protractor Smart also leads on review sentiment (40% vs 6%). Bubble Level Tool's advantage is update cadence (weekly vs every 21 months) and ratings volume (2.5K vs 242). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. Protractor Smart sells 1 one-off in-app purchase and Bubble Level Tool sells 9 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Protractor Smart holds the better App Store score, 4.6 against 4.4. That said, the two scores are not equally well evidenced: Bubble Level Tool has 2.5K ratings behind it against 242, so its average is the more settled of the two. Written reviews point the same way: 40% of Protractor Smart's written reviews are positive against 6% of Bubble Level Tool's.

Protractor Smart ships an update every 21 months, Bubble Level Tool weekly. Both last shipped on September 22, 2026.

## The numbers

| Metric | Protractor Smart | Bubble Level Tool |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (242 ratings)](https://appshunter.io/ios/app/protractor-smart/id1076530001/reviews)** | [4.4 (2.5K ratings)](https://appshunter.io/ios/app/bubble-level-tool-digital/id1662018802/reviews) |
| Number of ratings | 242 | **2.5K** |
| Positive reviews | **40.4% of reviews** | 6.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 21 months | **Weekly** |
| Monetization | **Free with in-app purchases** | Subscription |
| Size | 11 MB | 5 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ExaMobile S.A.](https://appshunter.io/developer/506014841) | [Rihab Mehboob](https://appshunter.io/developer/1441916319) |

## What reviewers say

### Protractor Smart

[App page](https://appshunter.io/ios/app/protractor-smart/id1076530001)

This app acts as a smart instrument for measuring angles using your device's camera. It offers two free modes for measuring angles on screen or using a plumb bob for slopes, with an additional premium mode for polygon measurements.

**Highlights:** Camera-based angle measurement, Touch measure mode, Plumb bob measure for slopes, Polygon measurement (premium), Screenshot functionality

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AdBlock - Remove ads | $1.99 | one-time |


### Bubble Level Tool

[App page](https://appshunter.io/ios/app/bubble-level-tool-digital/id1662018802)

Measure precise angles and levels with your device. Easily switch between portrait, landscape, and surface level modes. Lock and reset angles for accurate measurements.

**Highlights:** Measure current device angle, Reset angle, Lock angle, Portrait mode, Landscape mode, Surface level

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Bubble 1 Week | $3.99 | per 7 days |
| Bubble 1 Week | $4.99 | per 7 days |
| Bubble 1 Month | $5.99 | per month |
| Bubble 1 Month | $9.99 | per month |
| Bubble 1 Year | $24.99 | per year |
| Bubble 6 Months | $29.99 | per 6 months |
| Bubble 1 Year | $39.99 | per year |
| Bubble Lifetime | $17.99 | one-time |
| Bubble Lifetime | $69.99 | one-time |

**What reviewers like**

- ⭐️ Useful app
- 🤠 Handy when needed
- 👍 It simply works

**What reviewers complain about**

- 💰 Expensive subscription
- 🚫 Unusable without paying
- 📢 Constant upsell pop-ups
- 🕰️ Limited free trial
- 🤯 Frustrating experience

**Reported bugs**

- Inaccurate level readings
- Compatibility issues with older devices

**Requested features**

- Percentage slope display option
- Ability to switch between degree and percent
- Refund/cancellation options


## Frequently asked questions

### Is Protractor Smart free?

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

### Is Bubble Level Tool free?

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

### Which has better reviews, Protractor Smart or Bubble Level Tool?

Protractor Smart is rated higher. Protractor Smart averages 4.6 out of 5 from 242 ratings, while Bubble Level Tool averages 4.4 from 2.5K ratings.

### Do Protractor Smart or Bubble Level Tool have ads?

Neither Protractor Smart nor Bubble Level Tool shows ads.

### Which is updated more often, Protractor Smart or Bubble Level Tool?

Protractor Smart ships an update every 21 months, and Bubble Level Tool weekly. Most recently, Protractor Smart was updated on September 22, 2026 and Bubble Level Tool on September 22, 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.*