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Synapse: Device Check

Synapse: Device Check

Test Phones to Buy or Sell

10 ratings
9 reviews
🔧 Utilities
📊 Productivity
Free
In-App Purchases

Details

  • Released
  • Updated
  • June 29, 2026
  • July 19, 2026

Features

Developer

Nexus Link LLC
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Synapse: Device Check video #1 for iPhone
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Synapse: Device Check screenshot #3 for iPhone
Synapse: Device Check screenshot #4 for iPhone
Synapse: Device Check screenshot #5 for iPhone
Synapse: Device Check screenshot #6 for iPhone
Synapse: Device Check screenshot #7 for iPhone
Synapse: Device Check screenshot #8 for iPhone
Synapse: Device Check screenshot #9 for iPhone
Synapse: Device Check screenshot #10 for iPhone
🧾$2.99 - $9.99
In-App Purchase↘︎
⭐9
Reviews↘︎
❓8 answered
FAQ↘︎
📦~ in 5 days
Updates frequency↘︎
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About

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.

✓On-device hardware testing
✓Comprehensive sensor checks
✓Shareable pass/fail certificate
✓No account or data sharing
✓Quick free check available
✓Full diagnostic for purchase
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What's New in Synapse

2.2

July 19, 2026

Synapse now supports more iPhones! We've lowered the minimum requirement to iOS 15, so devices from iPhone 6s and newer can now run the full diagnostic. New in this update: Added Compass and Barometer to the Full Diagnostic New pre-run overview showing every test before you begin Improved audio testing experience

More
3

In-App Purchases

$2.99

Full Diagnostic

Full iPhone health check. Shareable report.

User reviews

Most RecentHighest RatedLowest Rated

Amazing!

I didn’t think I had so many dead pixels on my phone! Should’ve known from the amount of cracks I have on my screen. This app works so well to test out my phone for any damages. Definitely using Synapse in case I buy a new phone.
JellyJ23JellyJ23

Simple but Effective!

The details this app gets into is game changing, I didn’t even know you could test these!
InklingTurtle101InklingTurtle101

Ghost touch?

For someone who replaces screens and cameras all the time and need a form of quality check, this is definitely the way to go for a fast and easy touch test
OneNoteBoolinOneNoteBoolin

Saved me time and money !!!

Excellent app! It has helped me a lot with my business by checking phones before I buy them. The basic check is free and works great. In my case, I decided to pay for the premium version to get more detailed information about any possible damage to the phones, and it has been totally worth it.

It has made my job much easier. It's fast, reliable, effective, and offers great value for the price. I highly recommend it!
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chinita@16chinita@16

Great for checking phones

I really like that you are able to check the phone before buying it specially when I buy on OfferUp or FB you never know if you’re getting what you paid for definitely worth downloading this app. Specially if you are buying an iPhone, and want to make sure the camera works, screen, that it charges. I’m very happy with it.
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Mickeylover12Mickeylover12
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FAQ

What is Synapse?

Synapse is a utility app designed to perform on-device hardware diagnostics for iPhones. It tests various components like cameras, sensors, and connectivity, providing a shareable certificate of the device's condition for resale or purchase.

How much does Synapse cost?

The app offers a free Quick Check for basic diagnostics. For a full hardware suite, users can purchase checks individually for $2.99, a 3-pack for $4.99, or a 10-pack for $9.99. These are in-app purchases.

Does Synapse have ads?

No, Synapse does not contain advertisements. The app is free to download and use for basic checks, with full diagnostics available through in-app purchases.

What devices does Synapse support?

Currently, Synapse is designed to work with iPhones. The app requires specific hardware permissions including camera, microphone, location, motion sensors, Bluetooth, and Face ID.

How accurate is Synapse's testing?

Synapse performs a full on-device hardware check, testing components like display uniformity, touchscreen responsiveness, cameras, speakers, microphones, and biometric sensors. The goal is to provide reliable results for informed decisions.

Can I share the Synapse test results?

Yes, Synapse generates a shareable pass/fail certificate that includes device specifications like model, iOS version, storage, and battery status. This is ideal for attaching to resale listings.

Is my data safe with Synapse?

Synapse emphasizes 100% on-device testing, meaning no data is sent to any server. All results are shown locally on your phone, ensuring your privacy and security.

How often is Synapse updated?

Synapse was last updated on June 29, 2026, with version 1.0. As a new utility, future updates will likely focus on adding new features and improving existing diagnostics based on user feedback.