# Opus LF vs Great Security Alert

The clearest difference is iOS requirement: Great Security Alert at 11.0 against Opus LF's 13.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Opus LF ships an update every 3 months, Great Security Alert every 2 months. The most recent releases landed on September 8, 2026 and May 15, 2026 respectively.

## The numbers

| Metric | Opus LF | Great Security Alert |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Size | 82 MB | 28 MB |
| Requires iOS | 13.0 | **11.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Amigo Systems AB](https://appshunter.io/developer/1299663460) | [Skyresponse AB](https://appshunter.io/developer/639658030) |

## What reviewers say

### Opus LF

[App page](https://appshunter.io/ios/app/opus-lf/id1247772215)

**Features:** macOS Compatibility

**In-app purchases:** none


### Great Security Alert

[App page](https://appshunter.io/ios/app/great-security-alert/id1641878002)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Opus LF free?

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

### Is Great Security Alert free?

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

### Do Opus LF or Great Security Alert have ads?

Neither Opus LF nor Great Security Alert shows ads.

### Which is updated more often, Opus LF or Great Security Alert?

Opus LF ships an update every 3 months, and Great Security Alert every 2 months. Most recently, Opus LF was updated on September 8, 2026 and Great Security Alert on May 15, 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.*