# iSoundMeter vs TimeWave

The clearest difference is iOS requirement: iSoundMeter at 13.0 against TimeWave's 15.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. iSoundMeter sells 1 one-off in-app purchase and TimeWave sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

iSoundMeter ships an update weekly, TimeWave every 9 days. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | iSoundMeter | TimeWave |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.2 (46 ratings)](https://appshunter.io/ios/app/timewave-atomic-watch-sync/id6779167516/reviews)** |
| Number of ratings | — | **46** |
| Positive reviews | — | 84.6% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 9 days |
| Monetization | — | Free |
| Size | 47 MB | 3 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Deepak Sharma](https://appshunter.io/developer/1831560564) | [毅 何](https://appshunter.io/developer/1477138542) |

## What reviewers say

### iSoundMeter

[App page](https://appshunter.io/ios/app/isoundmeter-know-your-sounds/id6757108880)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| iSoundMeter Lifetime Premium | $2.99 | one-time |


### TimeWave

[App page](https://appshunter.io/ios/app/timewave-atomic-watch-sync/id6779167516)

This app simulates radio-controlled clock signals to help your watch synchronize its time when terrestrial signals are unavailable. It offers guides for popular watch brands and checks environmental conditions before transmission.

**Highlights:** Radio-controlled clock signal simulation, Support for multiple international time signals, Environment pre-check and recommendations, Smart output tuning for various audio paths, Local time mode for overseas watches, Watch-specific synchronization guides, Live signal visualization and sync history

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Buy Me a Coffee | $0.99 | one-time |
| Lifetime Membership | $3.99 | one-time |


## Frequently asked questions

### Is iSoundMeter free?

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

### Is TimeWave free?

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

### Do iSoundMeter or TimeWave have ads?

Neither iSoundMeter nor TimeWave shows ads.

### Which is updated more often, iSoundMeter or TimeWave?

iSoundMeter ships an update weekly, and TimeWave every 9 days. Most recently, iSoundMeter was updated on October 28, 2026 and TimeWave on October 31, 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.*