# Protractor Smart vs Pipe Math Pro

The clearest difference is price: Protractor Smart at Free against Pipe Math Pro's $9.99. Protractor Smart also leads on device support (3 vs 1) and iOS requirement (14.0 vs 17.6). Pipe Math Pro's advantage is in-app purchases (none vs 1) and chart position (#178 vs unranked). On ads there is nothing between them.

Protractor Smart is free to download; Pipe Math Pro costs $9.99 up front. Protractor Smart sells 1 one-off in-app purchase. Pipe Math Pro asks for nothing beyond the download.

Protractor Smart ships an update every 21 months, Pipe Math Pro every 10 months. The most recent releases landed on October 9, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Protractor Smart | Pipe Math Pro |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | **[4.6 (242 ratings)](https://appshunter.io/ios/app/protractor-smart/id1076530001/reviews)** | — |
| Number of ratings | **242** | — |
| Positive reviews | 43.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 21 months | **Every 10 months** |
| Monetization | Free with in-app purchases | — |
| Best chart rank | — | **#178** |
| Size | 11 MB | 4 MB |
| Requires iOS | **14.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [ExaMobile S.A.](https://appshunter.io/developer/506014841) | [Antonio Vitella](https://appshunter.io/developer/1797587730) |

## 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 |

**What reviewers like**

- 👍 Useful for measurements
- 👍 Accurate for its purpose
- 👍 Convenient and handy
- 👍 Good for specific tasks (e.g., knife sharpening, stereo mic angles)
- 👍 No excessive charges

**What reviewers complain about**

- 🐛 App freezes/loads indefinitely
- 🐛 Does not launch after updates
- 🐛 Stuck on loading screen
- 🐛 Inaccurate or unstable measurements
- 🐛 Camera quality issues

**Reported bugs**

- App loads indefinitely
- App does not launch after iOS updates
- Stuck on loading screen
- Photo upload not possible in premium version
- Upside-down protractor on iOS

**Requested features**

- Improve camera function (light, zoom)
- Add automatic hold function
- Increase digital readout size
- Add more skins/cosmetics
- Option to remove ads


### Pipe Math Pro

[App page](https://appshunter.io/ios/app/pipe-math-pro/id6742253582)

**Currently charting:** #178 Top Paid · Utilities (US App Store)

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

**In-app purchases:** none


## Frequently asked questions

### Is Protractor Smart free?

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

### Is Pipe Math Pro free?

Pipe Math Pro costs $9.99, with no in-app purchases.

### Do Protractor Smart or Pipe Math Pro have ads?

Neither Protractor Smart nor Pipe Math Pro shows ads.

### Which is updated more often, Protractor Smart or Pipe Math Pro?

Protractor Smart ships an update every 21 months, and Pipe Math Pro every 10 months. Most recently, Protractor Smart was updated on October 9, 2026 and Pipe Math Pro on October 5, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*