# Calculator S.L.U.Y.S+ vs Protractor

The clearest difference is price: Protractor at Free against Calculator S.L.U.Y.S+'s $1.99. Protractor also leads on update cadence (every 5 weeks vs every 3 months). Calculator S.L.U.Y.S+'s advantage is in-app purchases (none vs 2) and iOS requirement (15.5 vs 17.0). On ads and device support there is nothing between them.

Protractor is free to download; Calculator S.L.U.Y.S+ costs $1.99 up front. Protractor sells 2 one-off in-app purchases. Calculator S.L.U.Y.S+ asks for nothing beyond the download.

Calculator S.L.U.Y.S+ ships an update every 3 months, Protractor every 5 weeks. Both last shipped on November 3, 2026.

## The numbers

| Metric | Calculator S.L.U.Y.S+ | Protractor |
| --- | --- | --- |
| Price | $1.99 | **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 | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 3 MB | 7 MB |
| Requires iOS | **15.5** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ImagineSpark Inc.](https://appshunter.io/developer/1517195068) | [Noadit, Inc.](https://appshunter.io/developer/1516754355) |

## What reviewers say

### Calculator S.L.U.Y.S+

[App page](https://appshunter.io/ios/app/calculator-sluys-plus/id1517195069)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Bubble Tea | $0.99 | one-time |
| Coffee | $4.99 | one-time |


## Frequently asked questions

### Is Calculator S.L.U.Y.S+ free?

Calculator S.L.U.Y.S+ costs $1.99, with no in-app purchases.

### Is Protractor free?

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

### Do Calculator S.L.U.Y.S+ or Protractor have ads?

Neither Calculator S.L.U.Y.S+ nor Protractor shows ads.

### Which is updated more often, Calculator S.L.U.Y.S+ or Protractor?

Calculator S.L.U.Y.S+ ships an update every 3 months, and Protractor every 5 weeks. Most recently, Calculator S.L.U.Y.S+ was updated on November 3, 2026 and Protractor on November 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.*