# Protractor vs Smart Protractor

The clearest difference is update cadence: Smart Protractor at every 2 weeks against Protractor's every 5 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Protractor sells 6 in-app purchases, starting at $4.99 per month and Smart Protractor sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Protractor ships an update every 5 weeks, Smart Protractor every 2 weeks. The most recent releases landed on September 29, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | Protractor | Smart Protractor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.8 (6 ratings)](https://appshunter.io/ios/app/protractor-measure-angles/id1601838509/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 63.6% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 7 MB | 8 MB |
| Requires iOS | **17.0** | 17.2 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Noadit, Inc.](https://appshunter.io/developer/1516754355) | [Jun Yamabe](https://appshunter.io/developer/1732682049) |

## What reviewers say

### Protractor

[App page](https://appshunter.io/ios/app/protractor-measure-angles/id1601838509)

Measure angles precisely using your phone's screen, gyroscope, or camera. Offers smart presets, real-time feedback with high accuracy, and calibration features to adapt to various situations.

**Highlights:** 3-in-1 measurement modes, Smart angle presets with alerts, Hyper-responsive feedback (≤0.5° accuracy), Auto dynamic compensation calibration, Anti-shake technology for motion scenes, Screen lock for measurements

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VIP | $4.99 | per month |
| Bubble Tea | $0.99 | one-time |
| Sponsor | $4.99 | one-time |
| Coffee | $4.99 | one-time |
| Sponsor | $19.99 | one-time |
| Sponsor | $99.99 | one-time |


### Smart Protractor

[App page](https://appshunter.io/ios/app/smart-protractor/id6746047543)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


## Frequently asked questions

### Is Protractor free?

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

### Is Smart Protractor free?

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

### Do Protractor or Smart Protractor have ads?

Neither Protractor nor Smart Protractor shows ads.

### Which is updated more often, Protractor or Smart Protractor?

Protractor ships an update every 5 weeks, and Smart Protractor every 2 weeks. Most recently, Protractor was updated on September 29, 2026 and Smart Protractor on September 11, 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.*