# IDFA Viewer vs Rein

The clearest difference is in-app purchases: IDFA Viewer at none against Rein's 2. IDFA Viewer also leads on device support (3 vs 1). Rein's advantage is update cadence (every 2 days vs every 9 months). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Rein sells 2 in-app purchases, starting at $9.99 per month. IDFA Viewer asks for nothing beyond the download.

IDFA Viewer ships an update every 9 months, Rein every 2 days. The most recent releases landed on October 12, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | IDFA Viewer | Rein |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 2 days** |
| Size | 5 MB | 87 MB |
| Requires iOS | **15.6** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [翠芬 梁](https://appshunter.io/developer/1792659056) | [Workman Trading Company, LLC](https://appshunter.io/developer/1854471648) |

## What reviewers say

### IDFA Viewer

[App page](https://appshunter.io/ios/app/idfa-viewer-device-info-viewer/id6748586602)

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

**In-app purchases:** none


### Rein

[App page](https://appshunter.io/ios/app/rein-coding-agents-anywhere/id6779678366)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Rein Pro: Monthly | $9.99 | per month |
| Rein Pro: Annual | $79.99 | per year |


## Frequently asked questions

### Is IDFA Viewer free?

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

### Is Rein free?

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

### Do IDFA Viewer or Rein have ads?

Neither IDFA Viewer nor Rein shows ads.

### Which is updated more often, IDFA Viewer or Rein?

IDFA Viewer ships an update every 9 months, and Rein every 2 days. Most recently, IDFA Viewer was updated on October 12, 2026 and Rein on October 4, 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.*