# Soundra dB Meter vs Synapse

Soundra dB Meter and Synapse are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Soundra dB Meter sells 1 one-off in-app purchase and Synapse sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Soundra dB Meter ships an update every 2 weeks, Synapse every 6 days. The most recent releases landed on October 8, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Soundra dB Meter | 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 | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 6 days** |
| Monetization | — | Free with in-app purchases |
| Size | 64 MB | 5 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [胜佳 佟](https://appshunter.io/developer/1895576533) | [Nexus Link LLC](https://appshunter.io/developer/1521266947) |

## What reviewers say

### Soundra dB Meter

[App page](https://appshunter.io/ios/app/soundra-db-meter/id6770209522)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Soundra Pro Unlock | $3.99 | one-time |


### 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 Soundra dB Meter free?

Soundra dB Meter is free to download, with in-app purchases available.

### Is Synapse free?

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

### Do Soundra dB Meter or Synapse have ads?

Neither Soundra dB Meter nor Synapse shows ads.

### Which is updated more often, Soundra dB Meter or Synapse?

Soundra dB Meter ships an update every 2 weeks, and Synapse every 6 days. Most recently, Soundra dB Meter was updated on October 8, 2026 and Synapse on October 6, 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.*