# Fastsound vs Synapse

The clearest difference is in-app purchases: Fastsound at none against Synapse's 3. Fastsound also leads on iOS requirement (13.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. Synapse sells 3 one-off in-app purchases. Fastsound asks for nothing beyond the download.

## The numbers

| Metric | Fastsound | Synapse |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (10 ratings)](https://appshunter.io/ios/app/synapse-device-check/id6781245296/reviews)** |
| Number of ratings | — | **10** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 6 days |
| Monetization | — | Free with in-app purchases |
| Size | 19 MB | 5 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [杭州发声者声学科技有限公司](https://appshunter.io/developer/1894757529) | [Nexus Link LLC](https://appshunter.io/developer/1521266947) |

## What reviewers say

### Fastsound

[App page](https://appshunter.io/ios/app/fastsound/id6762584727)

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

**In-app purchases:** none


### Synapse

[App page](https://appshunter.io/ios/app/synapse-device-check/id6781245296)

Assess the hardware functionality of a device before buying or selling. It performs comprehensive on-device checks for cameras, sensors, connectivity, and more, generating a shareable certificate of its condition. This ensures transparency and confidence in transactions.

**Highlights:** On-device hardware testing, Comprehensive sensor checks, Shareable pass/fail certificate, No account or data sharing, Quick free check available, Full diagnostic for purchase

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Diagnostic | $2.99 | one-time |
| 3 Checks — Best Value | $4.99 | one-time |
| 10 Checks — Pro Pack | $9.99 | one-time |


## Frequently asked questions

### Is Fastsound free?

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

### Is Synapse free?

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

### Do Fastsound or Synapse have ads?

Neither Fastsound nor Synapse shows ads.

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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.*