# SiApp vs Angulus Pro

The clearest difference is in-app purchases: SiApp at none against Angulus Pro's 3. SiApp also leads on iOS requirement (13.0 vs 17.6). Angulus Pro's advantage is update cadence (fortnightly vs every 23 months). On price, ads and device support there is nothing between them.

Both are free to download. Angulus Pro sells 3 in-app purchases, starting at $2.99 per month. SiApp asks for nothing beyond the download.

SiApp ships an update every 23 months, Angulus Pro fortnightly. The most recent releases landed on October 5, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | SiApp | Angulus Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (26 ratings)](https://appshunter.io/ios/app/angulus-pro-precision-angle/id6736951943/reviews)** |
| Number of ratings | — | **26** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 23 months | **Fortnightly** |
| Monetization | — | Free with in-app purchases |
| Size | 28 MB | 134 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [JOSE EDUARDO FERRERA](https://appshunter.io/developer/1543586154) | [Yonaga](https://appshunter.io/developer/1774024485) |

## What reviewers say

### SiApp

[App page](https://appshunter.io/ios/app/siapp/id1554687101)

**Features:** macOS Compatibility

**In-app purchases:** none


### Angulus Pro

[App page](https://appshunter.io/ios/app/angulus-pro-precision-angle/id6736951943)

This app provides professional-grade angle measurements for clinical and personal use. It offers high precision, multiple measurement modes, and AI-powered camera assistance for accurate assessments and progress tracking.

**Highlights:** Precision to 0.01°, Four Measurement Modes, AI-Powered Camera Overlay, Real-Time Analysis, Clinical Documentation & Export, Progress Tracking

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Angulus Pro Monthly | $2.99 | per month |
| Angulus Pro Annually | $29.99 | per year |
| Angulus Pro Lifetime | $49.99 | one-time |


## Frequently asked questions

### Is SiApp free?

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

### Is Angulus Pro free?

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

### Do SiApp or Angulus Pro have ads?

Neither SiApp nor Angulus Pro shows ads.

### Which is updated more often, SiApp or Angulus Pro?

SiApp ships an update every 23 months, and Angulus Pro fortnightly. Most recently, SiApp was updated on October 5, 2026 and Angulus Pro on October 9, 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.*