# RPN vs Calculator .

The clearest difference is price: Calculator . at Free against RPN's $4.99. Calculator . also leads on update cadence (fortnightly vs every 7 months). RPN's advantage is in-app purchases (none vs 4) and device support (3 vs 1). On ads and iOS requirement there is nothing between them.

Calculator . is free to download; RPN costs $4.99 up front. Calculator . sells 4 in-app purchases, starting at $4.99 per 7 days. RPN asks for nothing beyond the download.

RPN ships an update every 7 months, Calculator . fortnightly. The most recent releases landed on October 4, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | RPN | Calculator . |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Fortnightly** |
| Size | 1 MB | 7 MB |
| Requires iOS | 16.6 | **16.0** |
| Devices | **iPhone, iPad, Mac** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Steven Davies](https://appshunter.io/developer/1705785558) | [Hong Kong Global Cross-Border E-Commerce Co., Limited](https://appshunter.io/developer/1693750577) |

## What reviewers say

### RPN

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

**Features:** Vision Pro support

**In-app purchases:** none


### Calculator .

[App page](https://appshunter.io/ios/app/calculator-ai-math-solver/id6776479693)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Peak | $4.99 | per 7 days |
| Weekly Ring | $9.99 | per 7 days |
| Yearly Peak | $39.99 | per year |
| Yearly Ring | $39.99 | per year |


## Frequently asked questions

### Is RPN free?

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

### Is Calculator . free?

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

### Do RPN or Calculator . have ads?

Neither RPN nor Calculator . shows ads.

### Which is updated more often, RPN or Calculator .?

RPN ships an update every 7 months, and Calculator . fortnightly. Most recently, RPN was updated on October 4, 2026 and Calculator . on October 17, 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.*