# Alert Simulator vs Rock Identifier

The clearest difference is in-app purchases: Alert Simulator at none against Rock Identifier's 2. Alert Simulator also leads on update cadence (every 2 weeks vs every 6 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Rock Identifier sells 2 in-app purchases, starting at $3.99 per 7 days. Alert Simulator asks for nothing beyond the download.

Alert Simulator ships an update every 2 weeks, Rock Identifier every 6 months. The most recent releases landed on October 30, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Alert Simulator | Rock Identifier |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 6 months |
| Size | 4 MB | 37 MB |
| Requires iOS | 18.0 | **17** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Brice Rosenzweig](https://appshunter.io/developer/315123923) | [Yusuf Ozmavi](https://appshunter.io/developer/1699479058) |

## What reviewers say

### Alert Simulator

[App page](https://appshunter.io/ios/app/alert-simulator/id6739960579)

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

**In-app purchases:** none


### Rock Identifier

[App page](https://appshunter.io/ios/app/rock-identifier-crystara/id6748089476)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Pro (Best Plan) | $3.99 | per 7 days |
| Yearly Pro | $49.99 | per year |


## Frequently asked questions

### Is Alert Simulator free?

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

### Is Rock Identifier free?

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

### Do Alert Simulator or Rock Identifier have ads?

Neither Alert Simulator nor Rock Identifier shows ads.

### Which is updated more often, Alert Simulator or Rock Identifier?

Alert Simulator ships an update every 2 weeks, and Rock Identifier every 6 months. Most recently, Alert Simulator was updated on October 30, 2026 and Rock Identifier on October 9, 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.*