# e Sono Phone Probe vs EchoMastery Pro

The clearest difference is in-app purchases: e Sono Phone Probe at none against EchoMastery Pro's 1. EchoMastery Pro's advantage is update cadence (every 2 days vs every 5 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. EchoMastery Pro sells 1 in-app purchase, starting at $6.99 per month. e Sono Phone Probe asks for nothing beyond the download.

e Sono Phone Probe ships an update every 5 months, EchoMastery Pro every 2 days. The most recent releases landed on October 18, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | e Sono Phone Probe | EchoMastery Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 days** |
| Size | 1 MB | 3 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [3B Scientific](https://appshunter.io/developer/1407867777) | [Christian Kirsch](https://appshunter.io/developer/1848333293) |

## What reviewers say

### e Sono Phone Probe

[App page](https://appshunter.io/ios/app/e-sono-phone-probe/id6743545381)

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

**In-app purchases:** none


### EchoMastery Pro

[App page](https://appshunter.io/ios/app/echomastery-pro/id6764770740)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| EchoMastery Pro Access | $6.99 | per month |


## Frequently asked questions

### Is e Sono Phone Probe free?

e Sono Phone Probe is free to download, with no in-app purchases.

### Is EchoMastery Pro free?

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

### Do e Sono Phone Probe or EchoMastery Pro have ads?

Neither e Sono Phone Probe nor EchoMastery Pro shows ads.

### Which is updated more often, e Sono Phone Probe or EchoMastery Pro?

e Sono Phone Probe ships an update every 5 months, and EchoMastery Pro every 2 days. Most recently, e Sono Phone Probe was updated on October 18, 2026 and EchoMastery Pro on October 12, 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.*