# ER1 ALARM vs audio compressor

The clearest difference is in-app purchases: ER1 ALARM at none against audio compressor's 2. ER1 ALARM also leads on device support (3 vs 1) and iOS requirement (11.0 vs 17.5). On price, update cadence and ads there is nothing between them.

Both are free to download. audio compressor sells 2 in-app purchases, starting at $3.99 per 7 days. ER1 ALARM asks for nothing beyond the download.

ER1 ALARM ships an update every 2 months, audio compressor every 6 weeks. The most recent releases landed on November 7, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | ER1 ALARM | audio compressor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/audio-compressor/id6612031833/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 46 MB | 1 MB |
| Requires iOS | **11.0** | 17.5 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [IMG Sicurezza Italia S.R.L.S.](https://appshunter.io/developer/1495771178) | [Muhammed Efdal incesu](https://appshunter.io/developer/1748859357) |

## What reviewers say

### ER1 ALARM

[App page](https://appshunter.io/ios/app/er1-alarm/id6444775610)

**Features:** macOS Compatibility

**In-app purchases:** none


### audio compressor

[App page](https://appshunter.io/ios/app/audio-compressor/id6612031833)

This utility app allows users to efficiently reduce the file size of their audio recordings. It offers a simple interface for selecting, compressing, and sharing audio, helping to save storage space and facilitate faster file transfers.

**Highlights:** Reduce audio file size, Maintain audio quality, Select and compress audio, Share compressed files, Save storage space

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Audio Compressor Weekly | $3.99 | per 7 days |
| Audio Compressor Lifetime | $17.99 | one-time |


## Frequently asked questions

### Is ER1 ALARM free?

ER1 ALARM is free to download, with no in-app purchases.

### Is audio compressor free?

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

### Do ER1 ALARM or audio compressor have ads?

Neither ER1 ALARM nor audio compressor shows ads.

### Which is updated more often, ER1 ALARM or audio compressor?

ER1 ALARM ships an update every 2 months, and audio compressor every 6 weeks. Most recently, ER1 ALARM was updated on November 7, 2026 and audio compressor 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.*