# iDiagnostic vs Synapse

The clearest difference is in-app purchases: iDiagnostic at none against Synapse's 3. Synapse's advantage is ratings volume (10 vs 1) and iOS requirement (15.0 vs 17.0). On price, rating, review sentiment and update cadence there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for iDiagnostic against 5.0 for Synapse. That said, the two scores are not equally well evidenced: Synapse has 10 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

iDiagnostic ships an update weekly, Synapse every 6 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | iDiagnostic | Synapse |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/idiagnostic/id6764337271/reviews) | [5.0 (10 ratings)](https://appshunter.io/ios/app/synapse-device-check/id6781245296/reviews) |
| Number of ratings | 1 | **10** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 6 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 9 MB | 5 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Giang Do](https://appshunter.io/developer/1434395412) | [Nexus Link LLC](https://appshunter.io/developer/1521266947) |

## What reviewers say

### iDiagnostic

[App page](https://appshunter.io/ios/app/idiagnostic/id6764337271)

This tool helps you quickly check the functionality of your iPhone or iPad's hardware components. It tests the display, touch screen, cameras, speakers, and microphone, ensuring everything is working as expected. Designed for privacy, all tests are performed on-device with no data collection.

**Highlights:** Display color and dead pixel test, Configurable touch screen grid test, Camera detection and individual testing, Speaker and earpiece audio output test, Microphone recording and playback test, On-device processing, no data collection

**Features:** macOS Compatibility

**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 iDiagnostic free?

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

### Is Synapse free?

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

### Which has better reviews, iDiagnostic or Synapse?

iDiagnostic and Synapse are both rated 5.0 out of 5 on the App Store, from 1 and 10 ratings respectively.

### Do iDiagnostic or Synapse have ads?

Neither iDiagnostic nor Synapse shows ads.

### Which is updated more often, iDiagnostic or Synapse?

iDiagnostic ships an update weekly, and Synapse every 6 days. Most recently, iDiagnostic was updated on October 31, 2026 and Synapse 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.*