# Right Angle vs Sindicato Centinela

The clearest difference is in-app purchases: Sindicato Centinela at none against Right Angle's 9. Sindicato Centinela also leads on iOS requirement (12.0 vs 26.0). Right Angle's advantage is update cadence (every 6 days vs every 44 months). On price, ads and device support there is nothing between them.

Both are free to download. Right Angle sells 9 in-app purchases, starting at $2.99 per month. Sindicato Centinela asks for nothing beyond the download.

Right Angle ships an update every 6 days, Sindicato Centinela every 44 months. The most recent releases landed on October 24, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Right Angle | Sindicato Centinela |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (30 ratings)](https://appshunter.io/ios/app/right-angle/id292390648/reviews)** | — |
| Number of ratings | **30** | — |
| Positive reviews | 73.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 days** | Every 44 months |
| Monetization | Free with in-app purchases | — |
| Size | 3 MB | 18 MB |
| Requires iOS | 26.0 | **12.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Jerry Mayers](https://appshunter.io/developer/287638654) | [Cloud Comunicaciones SpA](https://appshunter.io/developer/1557328318) |

## What reviewers say

### Right Angle

[App page](https://appshunter.io/ios/app/right-angle/id292390648)

This app calculates triangles and segments of circles. It supports various angle input formats and offers solutions for oblique triangles and circle segments with optional add-ons. A right triangle calculator is included for free.

**Highlights:** Triangle solver, Circle segment calculator, Multiple angle units (degrees, radians, DMS, grade, x/12), Oblique triangle solver (add-on), Circle segment solver (add-on), Free right triangle calculator

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Renews Monthly | $2.99 | per month |
| Renews Yearly | $14.99 | per year |
| Small Tip | $2.99 | one-time |
| Medium Tip | $4.99 | one-time |
| Segments Calculator | $5.99 | one-time |
| Oblique Triangle Calculator | $5.99 | one-time |
| Segment & Oblique Triangle | $6.99 | one-time |
| Large Tip | $9.99 | one-time |
| Huge Tip | $29.99 | one-time |

**What reviewers like**

- 👍 Easy to use
- 🚀 Saves time
- 🛠️ Useful for construction/trades
- 📐 Accurate calculations
- 💡 Unique functionality (historically)

**What reviewers complain about**

- 🐛 Recent updates removed key features
- 🐛 In-app purchases required for previously free features
- 🐛 Loss of purchase after update
- 🐛 App now requires payment for features
- 🐛 Misleading free app description

**Reported bugs**

- App crashes after startup
- Update caused app to crash
- Loss of previously purchased unlocked app
- Keyboard covers input fields
- App changes mm to unspecified units

**Requested features**

- Restore fraction support
- Restore feet and inches support
- Provide both angles of a right triangle
- Allow scrolling or hiding the keyboard
- Bundling with other tools


### Sindicato Centinela

[App page](https://appshunter.io/ios/app/sindicato-centinela/id1638184981)

**In-app purchases:** none


## Frequently asked questions

### Is Right Angle free?

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

### Is Sindicato Centinela free?

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

### Do Right Angle or Sindicato Centinela have ads?

Neither Right Angle nor Sindicato Centinela shows ads.

### Which is updated more often, Right Angle or Sindicato Centinela?

Right Angle ships an update every 6 days, and Sindicato Centinela every 44 months. Most recently, Right Angle was updated on October 24, 2026 and Sindicato Centinela on October 10, 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.*