# Jazz Disk Bench Pro — Storage Speed Test

> Pro-grade tool for measuring storage speed and performance on various devices. (iPhone/iPad app by Baofeng County Jixu Education Information Consulting Co., Ltd..)

- Source: https://appshunter.io/ios/app/jazz-disk-bench-pro/id1298441490 (this page in markdown: same URL + `.md`)
- Developer: [Baofeng County Jixu Education Information Consulting Co., Ltd.](https://appshunter.io/developer/1298441489)
- Category: Utilities
- Price: $2.99
- Rating: 4.40/5 from 28 App Store ratings · 23 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.2 · 66 MB
- Languages: American English, Chinese (Simplified, China), Chinese (Traditional, Taiwan)
- Released: 2017-10-22
- Data updated: 2026-08-23
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/jazz-disk-bench-pro/id1298441490/reviews.md

## What is Jazz Disk Bench Pro?

Jazz Disk Bench is a pro-grade storage performance measurement tool designed for SSDs, SD cards, and internal/external storage. Get accurate data on your device's throughput with industry-standard testing methods.

Key Features:
* Sequential Speed Test: Measure peak performance for copying large files (movies, games, etc.).
* 4K Random IOPS: Evaluate system responsiveness. Low random performance is often the root cause of device lag.
* Pro Stress Test: Push your storage to the limit with 2GB–100GB tests to check stability and "real" NAND speed after cache exhaustion.
* External Storage Support: Fully compatible with USB drives and SD cards via custom folder selection.

Benchmark Details:
* Sequential Test: Reads/writes 16MB blocks sequentially. Perfect for testing raw transfer speeds.
* Random Test (4K): Reads/writes 4KB blocks at random locations. This reflects how fast your OS launches apps and handles small files.
* Stress Test: Sequentially writes massive data (up to 100GB). Ideal for pro users to test SLC cache size and sustained NAND write performance.

Note: For external storage tests, ensure a stable connection and write permissions.

## Key features

- Sequential Speed Test
- 4K Random IOPS
- Pro Stress Test
- External Storage Support
- Benchmark Details

## Recent user reviews (10 of 23)

All indexed reviews: https://appshunter.io/ios/app/jazz-disk-bench-pro/id1298441490/reviews.md

### 1/5 — Very difficult to use

*2026-05-15*

I just want to test the true speed of my card reader onto my card on my iPhone 16 pro and on my iPad Pro , but I think using this app I need a computer science degree from MIT…

### 5/5 — Отличный софт

*2025-10-28*

В разделе «Setting» по умолчанию стоит параметр «internal», в пункте «target drive». 
Это означает, что скорость чтения и записи проверяется на телефоне, то есть скорость внутреннего накопителя. 
Для проверки скорости чтения и записи внешнего устройства выберите параметр «Custom», затем в проводнике выбираем нужный носитель и «выбрать»
Затем в меню «Benchmark» нажимаем старт
В целом программа очень удобная и понятная

### 2/5 — Poor measures

*2025-04-25*

Due to low size file transfered, the speed are rather random for external drives, no way to increase the size.

### 4/5 — Name and Capacity of drive please

*2025-03-17*

Good app! 
Please integrate the name and the capacity of the entire drive/stick. Other apps do that but they have not the proper values.

### 1/5 — Useless.  Not even worth a dollar

*2024-12-12*

The lite version of this app does a quick benchmark speed test of the internal SSD.

So I purchased the pro version for a dollar because it supposedly does a speed test of my external SSD.

But it does not do this. The app itself is horribly designed and just doesn't make sense. On the settings tab I can select an external. However, there is no way I can actually test this drive.

This app is useless. You get what you pay for. Except in this case it's not even worth a dollar.

Just stick with the light version if you want to test the internal SSD speed.

**Developer response:** Thanks for the feedback. After selecting external drive, you can go back to the benchmark tab to test the selected drive. We’ll consider a better design to make this more intuitive.

### 5/5 — 还不错

*2024-04-18*

不错可以跑速度，比较准确

### 5/5 — Great tool

*2023-05-26*

Perfectly supports external storage speed test which is great! Keep in mind you need to set correct path to a target drive in settings, by choosing “custom” instead of “internal”

### 5/5 — 更新中文界面啊

*2022-11-13*

中文开发者还不做一个中文界面？

**Developer response:** 马上安排😀

### 1/5 — Only tests internal speeds

*2022-08-02*

It only tests internal speeds.  If I knew this I would not have paid a dollar for it.  I know what my internal drive speed is.  There are thousands of benchmarks on the internet.  Refund please.

**Developer response:** If you want a refund, you can search "Request Refund for App Store Purchase" and then follow the steps. 

Edit: Thanks for the advice. External storage benchmark is now supported with 5.4.0 version.

### 5/5 — 问下开发者

*2022-06-18*

13promax读写速度只有600 900怎么回事

**Developer response:** 这个软件测试的是实际速度，有的软件跑的是缓存，不够准确

## Frequently asked questions about Jazz Disk Bench Pro

### What is Jazz Disk Bench Pro used for?

Jazz Disk Bench Pro is a professional tool designed to measure the performance of storage devices like SSDs, SD cards, and internal/external drives. It provides detailed metrics on sequential speeds, random IOPS, and stress test results.

### What kind of storage devices does Jazz Disk Bench Pro support?

The app supports a wide range of storage devices, including SSDs, SD cards, and internal/external storage. For external drives, it fully supports USB drives and SD cards through custom folder selection.

### How does Jazz Disk Bench Pro test storage speed?

It uses industry-standard testing methods. The Sequential Test measures peak performance for large files, the Random Test (4K) evaluates system responsiveness with small files, and the Pro Stress Test checks stability and sustained write performance.

### What are the pricing details for Jazz Disk Bench Pro?

Jazz Disk Bench Pro is available for a one-time purchase of $2.99. There are no in-app purchases or subscription fees associated with this application.

### What devices is Jazz Disk Bench Pro compatible with?

Jazz Disk Bench Pro is compatible with Mac, iPhone, and iPad devices. It is available for devices running iOS and macOS.

### How often is Jazz Disk Bench Pro updated?

The latest version, 7.1.0, was last updated on March 18, 2026. While this indicates a recent update, historical update frequency is not detailed in the provided data.

### Does Jazz Disk Bench Pro have ads?

No, Jazz Disk Bench Pro is ad-free. Users can perform storage tests without any interruptions from advertisements.

### What is the age rating for Jazz Disk Bench Pro?

Jazz Disk Bench Pro has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content.

## Version history (last 5 releases)

### 7.1.1 — 2026-06-16

Bug fixes and performance improvements

### 7.1.0 — 2026-03-18

Optimized for iOS 26 and bug fixes.

### 7.0.2 — 2024-03-01

External storage permission fix

### 7.0.0 — 2024-01-07

*Bug fixes
*Fix Chinese language support

### 6.5.1 — 2022-12-05

Compare button color fix.

## Apps similar to Jazz Disk Bench Pro

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [GravityMark GPU Benchmark](https://appshunter.io/ios/app/gravitymark-gpu-benchmark/id1595186532) | 4.2 (6) | Free | Utilities |
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| [Diskio - Disk Speed Analyzer](https://appshunter.io/ios/app/diskio-disk-speed-analyzer/id6467768299) | 3.9 (16) | $5.99 | Utilities |
| [SSD Performance Test](https://appshunter.io/ios/app/ssd-performance-test/id6740139555) | — | Free | Utilities |

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All apps by Baofeng County Jixu Education Information Consulting Co., Ltd.: https://appshunter.io/developer/1298441489

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*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 2026-08-23.*