# RPN vs Lizzy

The clearest difference is price: Lizzy at Free against RPN's $1.99. RPN's advantage is in-app purchases (none vs 1) and iOS requirement (12.0 vs 15.6). On update cadence, ads and device support there is nothing between them.

Lizzy is free to download; RPN costs $1.99 up front. Lizzy sells 1 in-app purchase, starting at $8.49 per year. RPN asks for nothing beyond the download.

RPN ships an update every 3 months, Lizzy every 2 months. The most recent releases landed on October 20, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | RPN | Lizzy |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[5.0 (14 ratings)](https://appshunter.io/ios/app/rpn-34-ce/id1448593029/reviews)** | — |
| Number of ratings | **14** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Paid | — |
| Size | 16 MB | 60 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [CuVee Software](https://appshunter.io/developer/424873503) | [Inoxsa Sarl](https://appshunter.io/developer/1483952812) |

## What reviewers say

### RPN

[App page](https://appshunter.io/ios/app/rpn-34-ce/id1448593029)

This app simulates a legendary scientific calculator, offering photo-realistic visuals and advanced functions like integration and root finding. It includes built-in programs and extensions for enhanced usability, making it a powerful tool for complex calculations.

**Highlights:** Photo-realistic look-and-feel, Programmable with 999 steps, Integration and root solving, Built-in application programs, Live register view, Program library and backup, Sharing via email, AirDrop, Dropbox

**Features:** macOS Compatibility

**In-app purchases:** none


### Lizzy

[App page](https://appshunter.io/ios/app/lizzy/id1483952813)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Abonnement premium 1 année | $8.49 | per year |


## Frequently asked questions

### Is RPN free?

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

### Is Lizzy free?

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

### Do RPN or Lizzy have ads?

Neither RPN nor Lizzy shows ads.

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

RPN ships an update every 3 months, and Lizzy every 2 months. Most recently, RPN was updated on October 20, 2026 and Lizzy on October 14, 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.*