# IDFA & Device Info Viewer vs Knock Knock

The clearest difference is ads: Knock Knock at none against IDFA & Device Info Viewer's shown. Knock Knock also leads on update cadence (every 5 days vs every 3 weeks) and iOS requirement (13.0 vs 15.6). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

IDFA & Device Info Viewer ships an update every 3 weeks, Knock Knock every 5 days. The most recent releases landed on November 5, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | IDFA & Device Info Viewer | Knock Knock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/idfa-and-device-info-viewer/id6745802620/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Monetization | Ad-supported | — |
| Size | 17 MB | 42 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Rodrigo Belloso](https://appshunter.io/developer/1361382340) | [Sarjan Patel](https://appshunter.io/developer/1817590129) |

## What reviewers say

### IDFA & Device Info Viewer

[App page](https://appshunter.io/ios/app/idfa-and-device-info-viewer/id6745802620)

Access your device's advertising ID (IDFA) and detailed technical specifications. View, copy, and share system information like model, OS, and storage. Designed for developers and curious users, it offers advanced insights through rewarded videos.

**Highlights:** View and copy IDFA, Access system details (model, OS, resolution, battery), Unlock extended info (IDFV, region, time zone, storage, memory, CPU), Export or share data, No logins or clutter, Advanced insights via rewarded video

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

**In-app purchases:** none


### Knock Knock

[App page](https://appshunter.io/ios/app/knock-knock-gated-security/id6746636097)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is IDFA & Device Info Viewer free?

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

### Is Knock Knock free?

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

### Do IDFA & Device Info Viewer or Knock Knock have ads?

IDFA & Device Info Viewer shows ads; Knock Knock does not.

### Which is updated more often, IDFA & Device Info Viewer or Knock Knock?

IDFA & Device Info Viewer ships an update every 3 weeks, and Knock Knock every 5 days. Most recently, IDFA & Device Info Viewer was updated on November 5, 2026 and Knock Knock on October 28, 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.*