# Plug & Sockets vs RPN

The clearest difference is price: Plug & Sockets at Free against RPN's $1.99. Plug & Sockets also leads on iOS requirement (9.0 vs 12.0). RPN's advantage is in-app purchases (none vs 1). On ads and device support there is nothing between them.

Plug & Sockets is free to download; RPN costs $1.99 up front. Plug & Sockets sells 1 one-off in-app purchase. RPN asks for nothing beyond the download.

## The numbers

| Metric | Plug & Sockets | RPN |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | — | **[5.0 (8 ratings)](https://appshunter.io/ios/app/rpn-55-sd/id1469907917/reviews)** |
| Number of ratings | — | **8** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | — | Every 3 months |
| Monetization | — | Paid |
| Size | 29 MB | 17 MB |
| Requires iOS | **9.0** | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [TapMafia](https://appshunter.io/developer/1064412019) | [CuVee Software](https://appshunter.io/developer/424873503) |

## What reviewers say

### Plug & Sockets

[App page](https://appshunter.io/ios/app/plug-and-sockets/id1445383245)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All Countries | $0.99 | one-time |


### RPN

[App page](https://appshunter.io/ios/app/rpn-55-sd/id1469907917)

This app is a photo-realistic simulation of a classic Hewlett-Packard programmable scientific calculator from the 1970s. It includes a 100-hour digital timer, clock functions, and original HP programs.

**Highlights:** Photo-realistic look-and-feel, Programmable with conditional branching, 100-hr timer and 12/24-hr clock, Original HP programs built-in, Extended features for enhanced usability, Sharing via email, AirDrop, and more

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Plug & Sockets free?

Plug & Sockets is free to download, with in-app purchases available.

### Is RPN free?

RPN costs $1.99, with no in-app purchases.

### Do Plug & Sockets or RPN have ads?

Neither Plug & Sockets nor RPN shows ads.

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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.*