# App Lock vs Horizon Detection

The clearest difference is rating: App Lock at 3.5 against Horizon Detection's 1.0. App Lock also leads on ratings volume (12 vs 1). Horizon Detection's advantage is update cadence (fortnightly vs monthly). On price, ads, in-app purchases and monetization model there is nothing between them.

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

App Lock holds the better App Store score, 3.5 against 1.0. That said, the two scores are not equally well evidenced: App Lock has 12 ratings behind it against 1, so its average is the more settled of the two.

App Lock ships an update monthly, Horizon Detection fortnightly. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | App Lock | Horizon Detection |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.5 (12 ratings)](https://appshunter.io/ios/app/app-lock-unlock-privacy-apps/id6502747859/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/horizon-detection/id6511216202/reviews) |
| Number of ratings | **12** | 1 |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Monthly | **Fortnightly** |
| Monetization | Ad-supported | Ad-supported |
| Size | 21 MB | 35 MB |
| Requires iOS | **16.0** | 17.7.2 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [小锋 张](https://appshunter.io/developer/1686869747) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### App Lock

[App page](https://appshunter.io/ios/app/app-lock-unlock-privacy-apps/id6502747859)

Secure your sensitive data and apps with a smart password lock. Protect your privacy by selecting which applications require a password for access. Features timed and location-based locking for enhanced security.

**Highlights:** Password lock for app access, Select specific apps to lock, One-click locking of selected apps, Timed and location-based locking, Simple and intuitive interface

**Features:** macOS Compatibility

**In-app purchases:** none


### Horizon Detection

[App page](https://appshunter.io/ios/app/horizon-detection/id6511216202)

This utility app identifies and highlights horizontal lines within an image. It's designed for users who need to analyze visual data for straight horizontal elements.

**Highlights:** Detects horizontal lines, Highlights detected lines, Image analysis tool, Simple interface

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is App Lock free?

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

### Is Horizon Detection free?

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

### Which has better reviews, App Lock or Horizon Detection?

App Lock is rated higher. App Lock averages 3.5 out of 5 from 12 ratings, while Horizon Detection averages 1.0 from 1 ratings.

### Do App Lock or Horizon Detection have ads?

Both App Lock and Horizon Detection show ads.

### Which is updated more often, App Lock or Horizon Detection?

App Lock ships an update monthly, and Horizon Detection fortnightly. Most recently, App Lock was updated on November 4, 2026 and Horizon Detection on October 30, 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.*