# Modern RPN vs Greyline FT8

The clearest difference is ratings volume: Greyline FT8 at 15 against Modern RPN's 1. Greyline FT8 also leads on chart position (#93 vs unranked). Modern RPN's advantage is review sentiment (100% vs 90%) and price ($2.99 vs $3.99). On rating, update cadence, ads and in-app purchases there is nothing between them.

Modern RPN costs $2.99 and Greyline FT8 $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Modern RPN against 4.9 for Greyline FT8. That said, the two scores are not equally well evidenced: Greyline FT8 has 15 ratings behind it against 1, so its average is the more settled of the two. Written reviews are what separate them: 100% of Modern RPN's written reviews are positive against 90% of Greyline FT8's.

Modern RPN ships an update every 5 days, Greyline FT8 every 4 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | Modern RPN | Greyline FT8 |
| --- | --- | --- |
| Price | **$2.99** | $3.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/modern-rpn/id6760340697/reviews)** | [4.9 (15 ratings)](https://appshunter.io/ios/app/greyline-ft8/id6773455172/reviews) |
| Number of ratings | 1 | **15** |
| Positive reviews | **100.0% of reviews** | 90.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 days | **Every 4 days** |
| Monetization | Paid | Paid |
| Best chart rank | — | **#93** |
| Size | 2 MB | 18 MB |
| Requires iOS | **26.2** | 26.5 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Kevin Flathers](https://appshunter.io/developer/1883973737) | [JONATHAN MARK SCHULMAN](https://appshunter.io/developer/6773455174) |

## What reviewers say

### Modern RPN

[App page](https://appshunter.io/ios/app/modern-rpn/id6760340697)

A minimalist reverse Polish notation calculator for iOS devices. It offers Standard, Binary, and Hex modes for quick calculations and programmer-friendly conversions, featuring a clean interface and a 4-level stack.

**Highlights:** Reverse Polish Notation (RPN) input, Standard, Binary, and Hex modes, 4-level visible stack, Calculation history, Saved session state, Clean dark interface

**Features:** macOS Compatibility

**In-app purchases:** none


### Greyline FT8

[App page](https://appshunter.io/ios/app/greyline-ft8/id6773455172)

**Currently charting:** #93 Top Paid · Utilities (US App Store)

This app provides a portable digital ham radio experience for field operations on iOS devices. It automates callsign lookups, displays real-time spot data, and offers automated calling or manual control for QSOs. Features include intelligent frequency selection, audio delay adjustment, and direct logging to QRZ.

**Highlights:** Field-ready digital ham radio, Automated callsign and DXCC lookups, Real-time PSK Reporter spot data, Automated CQ Gatherer and Hunter modes, Intelligent automatic frequency selection, Direct-to-QRZ logging and ADI export

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Modern RPN free?

Modern RPN costs $2.99, with no in-app purchases.

### Is Greyline FT8 free?

Greyline FT8 costs $3.99, with no in-app purchases.

### Which has better reviews, Modern RPN or Greyline FT8?

Modern RPN is rated higher. Modern RPN averages 5.0 out of 5 from 1 ratings, while Greyline FT8 averages 4.9 from 15 ratings.

### Do Modern RPN or Greyline FT8 have ads?

Neither Modern RPN nor Greyline FT8 shows ads.

### Which is updated more often, Modern RPN or Greyline FT8?

Modern RPN ships an update every 5 days, and Greyline FT8 every 4 days. Most recently, Modern RPN was updated on October 31, 2026 and Greyline FT8 on October 31, 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.*