All I wanted to press start and have it give me a read and write speed I could compare to other flash drives. Instead it begins this long series of reads and writes over and over again, with no progress bar indicating when, if ever, it will finish, and populates a table of video formats your drive will work with. As someone else mentioned, the state machine on the ONE control - the "Start/Stop" button - is broken. As an iOS Developer, I cannot concieve of how this has spent at least a year unfixed.

Why running forever with different results? What do all the little green checks mean? Are the results good or bad? What disk does it use? Etc.

Crashed when I was running a test on a brand new micro-SD card. It actually caused my MPB to crash and reboot. WTH? The card is corrupted now and will not mount. Also will not format because it is RAW. I'm working on it but thank God it wasn't my / disk! I've used this several times with no problem, but now I think I may never use it again.

Simple program that works smooth. The "help" in settings drop down explains how to use it if it's not obvious to you.

Yeah, the app does what it says and is easy to install. Would recommend.

It shows all drives (even the Apple installed SSD) as read-only, therefore unable to test. Worthless.

Agree with "Brandyhawk." The UI needs some serious improvements. It doesn't show which drive is being tested (or make it easy to actually select a drive), it doesn't show percentage complete (a first for a speed test app I've used!!) even though a progress meter is available but kinda hard to interpret, etc. Otherwise a useful app for testing new external drives, and works on Apple Silicon.

As other reviewers have mentioned, the user interface has some serious but easily fixed problems that make the program difficult to use at first. To fix these, 1. Have a separate Stop button or change the text on the Start button to Stop when the test is running. 2. Display the name of the drive being tested. 3. When saving a screenshot of the results, don't just use the current status, use the results of a full test. 4. The markings on the "tachometers" (like the red zone) are irrelevant and therefore confusing. 5. The "read-only" error message should say that sometimes you must choose a subfolder to make the test work. 6. Selecting the test drive should not be in the Setup.

Wanted to see if my cable to my external SSD was giving me full capacity speeds. It's also handy to give you a chart to tell you what your device was capable of handling. Easy to use interface.

It works on local drives and network drives, which is great. With my M2's drive testing at >2GB/s a 5GB file seems too small to really test accurately. Though the focus of this app isn't for accuracy but rather a quick tester for video files, so I guess thats okay. One odd feature is that once I start the Speed test, it won't stop until I interfere- it just keeps running the test over and over. This wouldn't be so confusing except the button still says "start", so you need to click start to stop it. Another slight annoyance is every time you save a screenshot, it doesn't remember where you last were and you need to navigate to the folder you want every time.