# JohnsonOTA vs RF 4DAT

The clearest difference is in-app purchases: JohnsonOTA at none against RF 4DAT's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. RF 4DAT sells 1 one-off in-app purchase. JohnsonOTA asks for nothing beyond the download.

JohnsonOTA ships an update every 2 months, RF 4DAT every 3 months. The most recent releases landed on September 26, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | JohnsonOTA | RF 4DAT |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Size | 22 MB | 1 MB |
| Requires iOS | **16** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [JOHNSON HEALTH TECH CO., LTD.](https://appshunter.io/developer/994439492) | [4DAT LLC](https://appshunter.io/developer/1649051364) |

## What reviewers say

### JohnsonOTA

[App page](https://appshunter.io/ios/app/johnsonota/id6741881473)

**Features:** macOS Compatibility

**In-app purchases:** none


### RF 4DAT

[App page](https://appshunter.io/ios/app/rf-4dat/id6757926768)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| RF 4DAT Pro | $2.99 | one-time |


## Frequently asked questions

### Is JohnsonOTA free?

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

### Is RF 4DAT free?

RF 4DAT is free to download, with in-app purchases available.

### Do JohnsonOTA or RF 4DAT have ads?

Neither JohnsonOTA nor RF 4DAT shows ads.

### Which is updated more often, JohnsonOTA or RF 4DAT?

JohnsonOTA ships an update every 2 months, and RF 4DAT every 3 months. Most recently, JohnsonOTA was updated on September 26, 2026 and RF 4DAT on October 10, 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.*