True SD Card Capacity & Speed

Alan Robinson

About this app

This "short" endurance test confirms if your 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. 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 you probably can test thumb drives too, depending on how your phone works.

Note: English only. The default settings are reasonable, however, so you may just proceed to "start test".

Ratings and reviews

Excellent. Very fast and easy to use. A cheap 32gb card took about 40 minutes to test and it was all as advertised. On my phone it worked at 1gb per minute to write and much faster to read. This is much quicker than using a PC to check micro SDs. If you use your phone for anything else the App pauses and you can just restart it. I tested a suspect 32gb cctv card. Files not readable. I guessed it was fake. The App found this and trashed the card, which was not reliable anyway.

Was easy to set up & use. screen looks OK on phone using. Got a 512gb card to check as so much is fake/flaky these days! But only shows 461gb! UHS-1.U3.V30.A1.gave 42.6MB & 58.1MB Read with no errors! & trying to find out what's what with memory cards is hard work as most sites are trying to direct you to amazon! But after some digging on APP store found this & had a read up about it so thought would try it out. Select what you want to test&tap go &leave it to its own device till finished.

this app works even in free mode. helped me determine that my sd card is damaged and the deep search function is awesome. It's been a since I found an app that functions better then advertised and completely free of charge without ads. five stars and two thumbs up!

What’s new

Full android 16 support.