True SD Card Capacity & Speed Test: Pro Version

122 reviews
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About this app

This "short" endurance test confirms if you SD card is valid and reliable or if it's a counterfeit that has way less storage space than advertised. It fills your card with carefully designed files that the app can then verify to ensure that what's written to your flash card can be read back reliability. It also measures read & write speed at the same time, because, why not?

It's not the most pretty app because the focus has been instead on real-world testing and good algorithms. It is, however, easy enough to use. The only way to know your card is good is to fill it to the advertised capacity. Typically this takes less than an hour but can be longer if the card is particularly slow or enormous. You can leave it running overnight. Piece of mind is worth the wait and there are no shortcuts to it!

You can also test your phone's internal storage. With USB-OTG some phones will let you test thumb drives too, but many phones don't follow the spec properly and don't give access to the OTG drives.

Note: interface is in English only.
Updated on
Oct 2, 2021

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122 reviews
Jack Night
April 14, 2022
When I tried out the free version it told me I had LOTS AND LOTS of problems with my new SD card on my phone. I went ahead and purchased the full version to more closely examine the problems and it was "amazing" that all of the problems had disappeared, all I had to do was pay and it was magically fixed. I can't say for certain it's a scam...but I won't buy anything from him again and am deleting the program just in case it has a vindictive nature.
10 people found this review helpful
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Alan Robinson
April 16, 2022
The two versions are identical in their testing method, there is no "magic fix". Something changed on your end, perhaps a removal and insertion of the card (which cleaned the contacts), etc.I would hesitate to use the card that is "fixed" as you stated. There is something failing intermittently in your setup, which makes diagnoses very difficult.
Mary Eaton
October 24, 2021
Great app. I checked my 1tb Sandisk micro. I let it fill it up to full then verified data. No issues were. It took 12 to 15 hrs to complete which is to be expected on such a large micro sd storage card. I just used in a backup phone. Didn't overheat my phone in the process. I restart my phone before using and reformated and set test to 100%. It pass no errors no where not on none of the files. So I feel comfortable feeling it up my data. Great app Alan. I have 235gb and 128gb I'm going to test.
20 people found this review helpful
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A Google user
August 26, 2019
Used this as two previous cards were listed as incorrect size so used this to test them to verify were fakes. Used on the 3rd card to make sure this was genuine. it's slow but does what it says on the tin to make sure and verify if its real or fake. with so many fake cards on the market now you can never be too sure. I will be supporting the developer by getting the pro version, which is the same price as a chocolate bar, and well worth it!
12 people found this review helpful
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What's new

New, more user friendly settings screen.