# Bubbles vs RST 599x

The clearest difference is price: Bubbles at Free against RST 599x's $1.99. RST 599x's advantage is update cadence (every 2 months vs every 37 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Bubbles is free to download; RST 599x costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Bubbles ships an update every 37 months, RST 599x every 2 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Bubbles | RST 599x |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rst-599x/id1498597799/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 37 months | **Every 2 months** |
| Monetization | **Free** | Paid |
| Size | 86 MB | 71 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ministry of Education](https://appshunter.io/developer/507340102) | [koji kamogawa](https://appshunter.io/developer/1488210713) |

## What reviewers say

### Bubbles

[App page](https://appshunter.io/ios/app/bubbles-ready-to-read/id892587714)

This interactive digital book teaches New Zealand Sign Language and English vocabulary through engaging animations, sound effects, and read-along features. It offers options for children to read independently or with narration, and includes coloring activities for illustrations.

**Highlights:** Swipe-to-Read™, Touch-to-Hear™, Touch-to-Spell™, Read-to-me and read-it-myself options, Record narration, Color illustrations, Animation and sound effects

**Features:** macOS Compatibility

**In-app purchases:** none


### RST 599x

[App page](https://appshunter.io/ios/app/rst-599x/id1498597799)

This app simulates real-time CW QSO interactions for amateur radio enthusiasts. It offers various QSO styles, realistic signal conditions, and customizable station settings for an authentic experience. Features include pile-up reproduction and RIT/filter functions.

**Highlights:** CW QSO simulation, Pile-up reproduction, Multiple QSO styles, RIT and CW filter, Realistic signal meter, Spectrum scope display

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Bubbles free?

Bubbles is free to download, with no in-app purchases.

### Is RST 599x free?

RST 599x costs $1.99, with no in-app purchases.

### Do Bubbles or RST 599x have ads?

Neither Bubbles nor RST 599x shows ads.

### Which is updated more often, Bubbles or RST 599x?

Bubbles ships an update every 37 months, and RST 599x every 2 months. Most recently, Bubbles was updated on November 1, 2026 and RST 599x on November 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*