# Cuspart vs RPN

The clearest difference is price: Cuspart at Free against RPN's $4.99. RPN's advantage is in-app purchases (none vs 4) and ads (none vs shown). On update cadence, device support and iOS requirement there is nothing between them.

Cuspart is free to download; RPN costs $4.99 up front. Cuspart sells 4 in-app purchases, starting at $0.99 per month. RPN asks for nothing beyond the download.

Cuspart ships an update every 4 months, RPN every 7 months. The most recent releases landed on October 29, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Cuspart | RPN |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/cuspart-mycal/id1546543143/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 4 months** | Every 7 months |
| Monetization | Free with in-app purchases | — |
| Size | 13 MB | 1 MB |
| Requires iOS | **16.0** | 16.6 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 12+ | 4+ |
| Developer | [Mustafa Tolga DALBUDAK](https://appshunter.io/developer/1479052908) | [Steven Davies](https://appshunter.io/developer/1705785558) |

## What reviewers say

### Cuspart

[App page](https://appshunter.io/ios/app/cuspart-mycal/id1546543143)

This app offers a professional-grade calculator with advanced math functions, a constants library, and intuitive history tracking. Customize your experience with various color themes and an accessible interface designed for ease of use.

**Highlights:** Basic and advanced arithmetic, Roots, powers, and logarithms, Constants library (π, e), Operation history, Customizable color themes, Accessible UI design

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month Subscription | $0.99 | per month |
| 3 Month Subscription | $2.99 | per 3 months |
| 12 Month Subscription | $9.99 | per year |
| myCal Pro | $2.99 | one-time |


### RPN

[App page](https://appshunter.io/ios/app/rpn-calc/id6464329997)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Cuspart free?

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

### Is RPN free?

RPN costs $4.99, with no in-app purchases.

### Do Cuspart or RPN have ads?

Cuspart shows ads; RPN does not.

### Which is updated more often, Cuspart or RPN?

Cuspart ships an update every 4 months, and RPN every 7 months. Most recently, Cuspart was updated on October 29, 2026 and RPN on October 27, 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.*