# RPN 28x Calc vs MathNotes

The clearest difference is price: MathNotes at Free against RPN 28x Calc's $6.99. MathNotes also leads on update cadence (every 4 days vs every 2 months). RPN 28x Calc's advantage is in-app purchases (none vs 8) and ratings volume (34 vs 2). On rating, review sentiment, ads and device support there is nothing between them.

MathNotes is free to download; RPN 28x Calc costs $6.99 up front. MathNotes sells 8 in-app purchases, starting at $1.99 per month. RPN 28x Calc asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for RPN 28x Calc against 5.0 for MathNotes. That said, the two scores are not equally well evidenced: RPN 28x Calc has 34 ratings behind it against 2, so its average is the more settled of the two. Written reviews are what separate them: 97% of RPN 28x Calc's written reviews are positive against 100% of MathNotes's.

RPN 28x Calc ships an update every 2 months, MathNotes every 4 days. The most recent releases landed on September 13, 2026 and August 24, 2026 respectively.

## The numbers

| Metric | RPN 28x Calc | MathNotes |
| --- | --- | --- |
| Price | $6.99 | **Free** |
| Rating | [5.0 (34 ratings)](https://appshunter.io/ios/app/rpn-28x-calc/id529927583/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/mathnotes-ai-notes-for-stem/id6751956086/reviews) |
| Number of ratings | **34** | 2 |
| Positive reviews | 96.7% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 3 MB | 181 MB |
| Requires iOS | **12.4** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [tredje design](https://appshunter.io/developer/495557933) | [Mark Miller](https://appshunter.io/developer/1836539324) |

## What reviewers say

### RPN 28x Calc

[App page](https://appshunter.io/ios/app/rpn-28x-calc/id529927583)

A programmable scientific calculator offering a classic aesthetic with modern functionality. It features a dynamic stack display, customizable buttons, and support for multiple data types, making complex calculations intuitive and accessible.

**Highlights:** Reverse Polish Notation (RPN) input, Dynamic stack display with scrolling, Customizable buttons and programming, Support for multiple data types (real, complex, binary, lists, etc.), 147 scientific units and physical constants, Interactive program debugging, Units and log viewers

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

**In-app purchases:** none


### MathNotes

[App page](https://appshunter.io/ios/app/mathnotes-ai-notes-for-stem/id6751956086)

This app offers a comprehensive suite for STEM students, combining handwritten note-taking with powerful math solving capabilities. It features an AI tutor, graphing tools, and specialized calculators, all designed to aid in learning and organization. Notes can be compiled into professional documents and exported as PDFs.

**Highlights:** Handwritten note-taking with Apple Pencil, Photo-based math problem solver, 12 specialized calculators, AI tutor for homework help, PDF import and annotation, Offline functionality, Export to formatted PDFs

**Features:** macOS Compatibility

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| iwrote Plus | $1.99 | per month |
| MathNotes Premium | $9.99 | per month |
| MathNotes Pro | $9.99 | per month |
| MathNotes Plus | $19.99 | per year |
| MathNotes Pro | $99.99 | per year |
| 1 Course Credit | $24.99 | one-time |
| 3 MathNotes Credits | $54.99 | one-time |
| 5 MathNotes Credits | $74.99 | one-time |


## Frequently asked questions

### Is RPN 28x Calc free?

RPN 28x Calc costs $6.99, with no in-app purchases.

### Is MathNotes free?

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

### Which has better reviews, RPN 28x Calc or MathNotes?

RPN 28x Calc and MathNotes are both rated 5.0 out of 5 on the App Store, from 34 and 2 ratings respectively.

### Do RPN 28x Calc or MathNotes have ads?

Neither RPN 28x Calc nor MathNotes shows ads.

### Which is updated more often, RPN 28x Calc or MathNotes?

RPN 28x Calc ships an update every 2 months, and MathNotes every 4 days. Most recently, RPN 28x Calc was updated on September 13, 2026 and MathNotes on August 24, 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.*