# Slope Calculator vs Protractor for Angle Measuring

The clearest difference is ads: Slope Calculator at none against Protractor for Angle Measuring's shown. Slope Calculator also leads on review sentiment (58% vs 50%) and iOS requirement (13.0 vs 16.6). Protractor for Angle Measuring's advantage is update cadence (every 2 weeks vs every 14 months) and rating (4.5 vs 4.3). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. Slope Calculator sells 1 one-off in-app purchase and Protractor for Angle Measuring sells 5 in-app purchases, starting at $0.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Protractor for Angle Measuring holds the better App Store score, 4.5 against 4.3. That said, the two scores are not equally well evidenced: Protractor for Angle Measuring has 1K ratings behind it against 104, so its average is the more settled of the two. Written reviews complicate that: 58% of Slope Calculator's written reviews are positive against 50% of Protractor for Angle Measuring's, so the app with the better star average is not the one people write more warmly about.

Slope Calculator ships an update every 14 months, Protractor for Angle Measuring every 2 weeks. The most recent releases landed on September 16, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Slope Calculator | Protractor for Angle Measuring |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (104 ratings)](https://appshunter.io/ios/app/slope-calculator-calc/id1561129699/reviews) | **[4.5 (1K ratings)](https://appshunter.io/ios/app/protractor-for-angle-measuring/id6474609160/reviews)** |
| Number of ratings | 104 | **1K** |
| Positive reviews | **58.3% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 14 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 5 MB | 112 MB |
| Requires iOS | **13.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Phan Nhat Đang](https://appshunter.io/developer/1437390098) | [AppLiks Sp. z O.O.](https://appshunter.io/developer/1804335622) |

## What reviewers say

### Slope Calculator

[App page](https://appshunter.io/ios/app/slope-calculator-calc/id1561129699)

Calculate slope in angle, percentage, or ratio by inputting two sides of a right triangle. This intuitive and easy-to-use application provides the remaining necessary values.

**Highlights:** Calculate slope as angle, Calculate slope as percentage, Calculate slope as ratio, Input two sides of a right triangle, Calculate remaining triangle values, Intuitive and easy to use

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

**In-app purchases (1)**

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


### Protractor for Angle Measuring

[App page](https://appshunter.io/ios/app/protractor-for-angle-measuring/id6474609160)

Transform your iPhone into a precision angle measuring tool. Easily measure angles in real-time using touch or camera modes, and even analyze angles in existing photos. Customize your tools for a seamless experience.

**Highlights:** Real-time angle measurement, Touch and camera modes, Measure angles in photos, Simultaneous unlimited angle measurement, Tool color customization, Plumb bob pendulum for tilt

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Access | $0.99 | per 7 days |
| Weekly Access with Trial | $1.99 | per 7 days |
| Weekly Access | $1.99 | per 7 days |
| Yearly Access | $3.99 | per year |
| Yearly Access | $4.99 | per year |

**What reviewers like**

- 👍 Useful for surveying and measuring angles
- 💡 Interesting use of camera to overlay protractor
- 👍 Helps with specific use cases like golf setup
- 👍 Provides a clutter-free protractor experience

**What reviewers complain about**

- 🐛 Difficulty using the protractor tool and angle measurement
- 🐛 Inability to zoom in/out when measuring angles in photos
- 🐛 Inaccurate angle measurements in some cases

**Reported bugs**

- Protractor tool is hard to use and requires multiple tries
- Angle measurements do not match real-world angles

**Requested features**

- Add more instructions and guidance for using the protractor tool
- Improve the zoom functionality when measuring angles in photos
- Enhance the accuracy of angle measurements


## Frequently asked questions

### Is Slope Calculator free?

Slope Calculator is free to download, with in-app purchases available.

### Is Protractor for Angle Measuring free?

Protractor for Angle Measuring is free to download, with in-app purchases available.

### Which has better reviews, Slope Calculator or Protractor for Angle Measuring?

Protractor for Angle Measuring is rated higher. Slope Calculator averages 4.3 out of 5 from 104 ratings, while Protractor for Angle Measuring averages 4.5 from 1K ratings.

### Do Slope Calculator or Protractor for Angle Measuring have ads?

Protractor for Angle Measuring shows ads; Slope Calculator does not.

### Which is updated more often, Slope Calculator or Protractor for Angle Measuring?

Slope Calculator ships an update every 14 months, and Protractor for Angle Measuring every 2 weeks. Most recently, Slope Calculator was updated on September 16, 2026 and Protractor for Angle Measuring on September 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.*