# Protractor Angle Measure Tool vs Opti Clinometer

The clearest difference is in-app purchases: Opti Clinometer at none against Protractor Angle Measure Tool's 4. Opti Clinometer also leads on update cadence (every 2 days vs monthly). Protractor Angle Measure Tool's advantage is device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Protractor Angle Measure Tool sells 4 in-app purchases, starting at $4.99 per 7 days. Opti Clinometer asks for nothing beyond the download.

Protractor Angle Measure Tool ships an update monthly, Opti Clinometer every 2 days. The most recent releases landed on October 12, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Protractor Angle Measure Tool | Opti Clinometer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (176 ratings)](https://appshunter.io/ios/app/protractor-angle-measure-tool/id6742701087/reviews)** | — |
| Number of ratings | **176** | — |
| Positive reviews | 11.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 79 MB | 2 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Appcellent](https://appshunter.io/developer/1870956141) | [Burak Kizilobek](https://appshunter.io/developer/6788531231) |

## What reviewers say

### Protractor Angle Measure Tool

[App page](https://appshunter.io/ios/app/protractor-angle-measure-tool/id6742701087)

This tool transforms your device into a precise angle measurement instrument. It's ideal for DIY projects, construction, and renovations, offering real-time readings in various formats. Get professional-grade accuracy for all your angled surface needs.

**Highlights:** Precise angle measurement, Vertical and horizontal orientations, Multiple measurement units (degrees, radians, gradians), Target angle alerts with audio/vibration, Real-time precision readings, Apple Watch support with haptic feedback

**Features:** Apple Watch app

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Protractor Weekly | $4.99 | per 7 days |
| Protractor Weekly with Trial | $6.99 | per 7 days |
| Protractor Weekly with Trial | $8.99 | per 7 days |
| Protractor Annual | $39.99 | per year |


### Opti Clinometer

[App page](https://appshunter.io/ios/app/opti-clinometer/id6788531229)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Protractor Angle Measure Tool free?

Protractor Angle Measure Tool is free to download, with in-app purchases available.

### Is Opti Clinometer free?

Opti Clinometer is free to download, with no in-app purchases.

### Do Protractor Angle Measure Tool or Opti Clinometer have ads?

Neither Protractor Angle Measure Tool nor Opti Clinometer shows ads.

### Which is updated more often, Protractor Angle Measure Tool or Opti Clinometer?

Protractor Angle Measure Tool ships an update monthly, and Opti Clinometer every 2 days. Most recently, Protractor Angle Measure Tool was updated on October 12, 2026 and Opti Clinometer on October 3, 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.*