# Door Alert vs Castify

The clearest difference is in-app purchases: Door Alert at none against Castify's 4. Castify's advantage is update cadence (every 3 days vs every 33 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Castify sells 4 in-app purchases, starting at $4.99 per 7 days. Door Alert asks for nothing beyond the download.

Door Alert ships an update every 33 months, Castify every 3 days. The most recent releases landed on October 10, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Door Alert | Castify |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.5 (2 ratings)](https://appshunter.io/ios/app/door-alert/id1076093852/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 33 months | **Every 3 days** |
| Monetization | Free | — |
| Size | 5 MB | 19 MB |
| Requires iOS | 15.0 | **14** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Russell Harper](https://appshunter.io/developer/581673732) | [瑞华 张](https://appshunter.io/developer/1608130007) |

## What reviewers say

### Door Alert

[App page](https://appshunter.io/ios/app/door-alert/id1076093852)

This utility app acts as a simple security monitor for your smartphone. It detects unauthorized door entries or exits and notifies you immediately. It's designed to offer an extra layer of security for families with young children.

**Highlights:** Unauthorized exit/entry detection, Immediate audible alarm, Optional silent email/SMS alerts, Works with or without cellular, Low battery usage

**Features:** macOS Compatibility

**In-app purchases:** none


### Castify

[App page](https://appshunter.io/ios/app/castify-web-video-caster/id6774901335)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $4.99 | per 7 days |
| Monthly Premium | $9.99 | per month |
| Yearly Premium | $39.99 | per year |
| Lifetime Premium | $69.99 | one-time |


## Frequently asked questions

### Is Door Alert free?

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

### Is Castify free?

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

### Do Door Alert or Castify have ads?

Neither Door Alert nor Castify shows ads.

### Which is updated more often, Door Alert or Castify?

Door Alert ships an update every 33 months, and Castify every 3 days. Most recently, Door Alert was updated on October 10, 2026 and Castify 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.*