# explainEN287 vs Right Angle PRO

The clearest difference is in-app purchases: explainEN287 at none against Right Angle PRO's 2. Right Angle PRO's advantage is update cadence (monthly vs every 20 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Right Angle PRO sells 2 in-app purchases, starting at $3.99 per month. explainEN287 asks for nothing beyond the download.

explainEN287 ships an update every 20 months, Right Angle PRO monthly. The most recent releases landed on October 5, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | explainEN287 | Right Angle PRO |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 20 months | **Monthly** |
| Size | 1 MB | 17 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Georg Rose](https://appshunter.io/developer/521567472) | [Masashi Konno](https://appshunter.io/developer/1877017984) |

## What reviewers say

### explainEN287

[App page](https://appshunter.io/ios/app/explainen287/id656646286)

**Features:** macOS Compatibility

**In-app purchases:** none


### Right Angle PRO

[App page](https://appshunter.io/ios/app/right-angle-pro-factory-calc/id6760681480)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| RightAngle PRO Monthly | $3.99 | per month |
| RightAngle PRO Yearly | $39.99 | per year |


## Frequently asked questions

### Is explainEN287 free?

explainEN287 is free to download, with no in-app purchases.

### Is Right Angle PRO free?

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

### Do explainEN287 or Right Angle PRO have ads?

Neither explainEN287 nor Right Angle PRO shows ads.

### Which is updated more often, explainEN287 or Right Angle PRO?

explainEN287 ships an update every 20 months, and Right Angle PRO monthly. Most recently, explainEN287 was updated on October 5, 2026 and Right Angle PRO on September 28, 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.*