# Radio Button vs Viewer Prime

The clearest difference is in-app purchases: Radio Button at none against Viewer Prime's 1. Radio Button also leads on iOS requirement (11.0 vs 16.0). Viewer Prime's advantage is ads (none vs shown). On price, update cadence and device support there is nothing between them.

Both are free to download. Viewer Prime sells 1 in-app purchase, starting at $3.99 per month. Radio Button asks for nothing beyond the download.

Radio Button ships an update every 4 months, Viewer Prime every 8 months. The most recent releases landed on October 26, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Radio Button | Viewer Prime |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 4 months** | Every 8 months |
| Size | 116 MB | 18 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 12+ |
| Developer | [ATJ Inc](https://appshunter.io/developer/1438668665) | [Endavo Media and Communications, Inc.](https://appshunter.io/developer/641607456) |

## What reviewers say

### Radio Button

[App page](https://appshunter.io/ios/app/radio-button/id1439130930)

**Features:** macOS Compatibility

**In-app purchases:** none


### Viewer Prime

[App page](https://appshunter.io/ios/app/viewer-prime/id1504209788)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Unlimited | $3.99 | per month |


## Frequently asked questions

### Is Radio Button free?

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

### Is Viewer Prime free?

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

### Do Radio Button or Viewer Prime have ads?

Radio Button shows ads; Viewer Prime does not.

### Which is updated more often, Radio Button or Viewer Prime?

Radio Button ships an update every 4 months, and Viewer Prime every 8 months. Most recently, Radio Button was updated on October 26, 2026 and Viewer Prime on October 25, 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.*