# Black Box vs Callnor

Black Box and Callnor are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Black Box ships an update every 3 days, Callnor every 4 days. Both last shipped on October 24, 2026.

## The numbers

| Metric | Black Box | Callnor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (41 ratings)](https://appshunter.io/ios/app/black-box-lock-restrict-apps/id6547836962/reviews)** | — |
| Number of ratings | **41** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 4 days |
| Monetization | Free | — |
| Size | 68 MB | 4 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [俊涛 刘](https://appshunter.io/developer/1702439770) | [Michael Schoenbeck](https://appshunter.io/developer/1887127479) |

## What reviewers say

### Black Box

[App page](https://appshunter.io/ios/app/black-box-lock-restrict-apps/id6547836962)

Secure your phone by locking and restricting access to sensitive applications. Protect your private data with advanced password protection and prevent unauthorized app usage or in-app purchases. Enjoy comprehensive digital privacy with an easy-to-use interface.

**Highlights:** App locking with password protection, App disappearance for hidden access, App usage restrictions, Secure privacy with advanced passwords, Payment locking for in-app purchases, Intuitive interface

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

**In-app purchases:** none


### Callnor

[App page](https://appshunter.io/ios/app/callnor/id6793676356)

**In-app purchases:** none


## Frequently asked questions

### Is Black Box free?

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

### Is Callnor free?

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

### Do Black Box or Callnor have ads?

Neither Black Box nor Callnor shows ads.

### Which is updated more often, Black Box or Callnor?

Black Box ships an update every 3 days, and Callnor every 4 days. Most recently, Black Box was updated on October 24, 2026 and Callnor on October 24, 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.*