# Synapse: Device Check — Test Phones to Buy or Sell > On-device hardware diagnostic tool for mobile devices, generating shareable condition certificates. (iPhone/iPad app by Nexus Link LLC.) - Source: https://appshunter.io/ios/app/synapse-device-check/id6781245296 (this page in markdown: same URL + `.md`) - Developer: [Nexus Link LLC](https://appshunter.io/developer/1521266947) - Category: Utilities, Productivity - Price: Free with in-app purchases - Rating: 5.00/5 from 10 App Store ratings · 9 written reviews indexed - Age rating: 4+ - Requires: iOS 15.0 · 5 MB - Languages: English - Released: 2026-06-29 - Data updated: 2026-07-24 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/synapse-device-check/id6781245296/reviews.md ## What is Synapse? Buying or selling a used iPhone? Know what works before money changes hands. Synapse helps you test key iPhone hardware — including cameras, speakers, microphones, sensors, buttons, connectivity, and biometrics — then creates a clear pass/fail device report you can share with a buyer, seller, repair shop, or resale listing. QUICK CHECK — FREE Run a basic test in minutes. No purchase required. Tests include: • Display • Touchscreen • Rear camera • Wi-Fi • Bluetooth FULL DIAGNOSTIC Unlock the complete hardware test suite and generate a shareable device report. Full Diagnostic includes: • Front camera and flashlight • Video recording • Microphones and speakers • Proximity sensor • Motion sensors • Screen rotation • Face ID or Touch ID sensor check • Vibration motor • Volume, lock, and mute buttons • GPS / location accuracy • System integrity indicators • Shareable pass/fail report with device details DEVICE CHECKS Purchase Device Checks in the app and save them to your account. Available options: • Single Device Check • 3 Device Checks • 10 Device Checks Sign in with Apple or email to save your purchased Device Checks, view your remaining checks, and use them on this device or another signed-in device. KEY FEATURES • Free Quick Check • Full Diagnostic hardware testing • Shareable pass/fail device report • Device Checks saved to your account • View remaining Device Checks in your Profile • Useful for buying, selling, repairing, or verifying a used iPhone PRIVACY Synapse runs hardware tests on your device. Your account is used to save purchased Device Checks and help you access them across signed-in devices. Permissions may be requested for camera, microphone, location during GPS testing, motion sensors, Bluetooth, Face ID / Touch ID checks, and local network features when needed. Apple, iPhone, Face ID, and Touch ID are trademarks of Apple Inc. ## Key features - On-device hardware testing - Comprehensive sensor checks - Shareable pass/fail certificate - No account or data sharing - Quick free check available - Full diagnostic for purchase ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Full Diagnostic | $2.99 | one-time | | 3 Checks — Best Value | $4.99 | one-time | | 10 Checks — Pro Pack | $9.99 | one-time | ## Recent user reviews (9 of 9) All indexed reviews: https://appshunter.io/ios/app/synapse-device-check/id6781245296/reviews.md ### 5/5 — Amazing! *2026-07-05* 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. ### 5/5 — Simple but Effective! *2026-07-04* The details this app gets into is game changing, I didn’t even know you could test these! ### 5/5 — Ghost touch? *2026-07-04* 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 ### 5/5 — Saved me time and money !!! *2026-07-04* 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! ### 5/5 — Great for checking phones *2026-07-04* 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. ### 5/5 — Network Security Expert *2026-07-03* Excellent App, Thank you for being so professional and always giving us accurate and reliable information on apple services and products, wishing you and Nexus continued success!! Many blessings to you ### 5/5 — Don’t get scammed *2026-07-01* This app is gonna save you from buying a broken phone it checks even sensors I forgot existed 😂 ### 5/5 — Game changer *2026-06-29* Excellent app! It helps me quickly check iPhones before buying them. Easy to use and a huge time saver. Highly recommend! ### 5/5 — Excellent *2026-06-29* Very useful ## Frequently asked questions about Synapse ### 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. ## Version history (last 4 releases) ### 2.2 — 2026-07-19 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 ### 2.1 — 2026-07-10 This update makes Synapse easier to use across devices. You can now sign in with Apple or use email one-time-code sign-in to create an account without a password. Your purchased Device Checks are saved to your account, can be viewed in your Profile, and can be used on this device or another signed-in device. We also improved the purchase experience, clarified account requirements, and refined the diagnostic report flow. ### 2.0 — 2026-07-04 This update makes Synapse easier to use across devices. • Sign in with Apple or create an account with email • Save purchased Device Checks to your account • View your remaining Device Checks in your Profile • Use checks on this device or another signed-in device • Improved purchase flow with clearer account requirements • Refined report access, UI details, and overall stability ### 1.0 — 2026-06-29 No release notes. ## More apps by Nexus Link LLC - [Maxandfix - Renewed Tech](https://appshunter.io/ios/app/maxandfix-renewed-tech/id1673053388) All apps by Nexus Link LLC: https://appshunter.io/developer/1521266947 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-24.*