# Decibel Sondex vs Campus Command

The clearest difference is in-app purchases: Campus Command at none against Decibel Sondex's 9. Campus Command also leads on update cadence (weekly vs fortnightly) and device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Decibel Sondex sells 9 in-app purchases, starting at $4.99 per 7 days. Campus Command asks for nothing beyond the download.

Decibel Sondex ships an update fortnightly, Campus Command weekly. The most recent releases landed on October 29, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Decibel Sondex | Campus Command |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | **Weekly** |
| Size | 87 MB | 24 MB |
| Requires iOS | 18.6 | **17.0** |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 12+ | 4+ |
| Developer | [Pixaro Studio](https://appshunter.io/developer/1896290085) | [Matthew Notley](https://appshunter.io/developer/6773025931) |

## What reviewers say

### Decibel Sondex

[App page](https://appshunter.io/ios/app/decibel-sondex-db-sound-meter/id6766494947)

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Standard Weekly Access | $4.99 | per 7 days |
| Limited offer | $8.99 | per month |
| Standard Weekly Access | $9.99 | per 7 days |
| Standard Monthly Access | $12.99 | per month |
| PRO Monthly Access | $19.99 | per month |
| Standard Monthly Access | $29.99 | per month |
| Pro Monthly Access | $39.99 | per month |
| PRO Yearly Access | $99.99 | per year |
| Pro Yearly Access | $399.99 | per year |


### Campus Command

[App page](https://appshunter.io/ios/app/campus-command/id6773025929)

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is Decibel Sondex free?

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

### Is Campus Command free?

Campus Command is free to download, with no in-app purchases.

### Do Decibel Sondex or Campus Command have ads?

Neither Decibel Sondex nor Campus Command shows ads.

### Which is updated more often, Decibel Sondex or Campus Command?

Decibel Sondex ships an update fortnightly, and Campus Command weekly. Most recently, Decibel Sondex was updated on October 29, 2026 and Campus Command on November 5, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*