SD Card Test Pro

4.6
487 reviews
10K+
Downloads
Content rating
Everyone
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About this app

Use the best SD speed test tool! Test the speed of internal or external storage, sd card!

Easy to use even for beginners. Quick tests.

Highlighted features:
✔ Measure the speed of your external (removable) SD card
✔ Measure the speed of your internal storage
✔ Verify written data: damaged or fake card detection
✔ Read/write tests using several different combinations.
✔ Customized benchmarks
✔ Show storage type: eMMC, UFS 2.0 and 2.1 or higher
✔ Show class: Class 2, Class 4, Class 6, Class 10, UHS-I, UHS-II and UHS-III
✔ Detecting storage type and class
✔ Supporting several file systems like ext4, exFAT or FAT/FAT32.
✔ Support portable and adoptable storage as well
✔ Show storage details: free space, total space, mount options, device name

Supported memory cards:
* Basically any sd cards: Micro SD, SDHC and SDXC
* built-in memory (card)

Good to know:
✔ If the sd card is formatted as adoptable storage, the app may unable to access it directly. In that case either move the app to the adoptable storage (change the install storage), or format the storage as portable storage.

How to use it:
First select the storage type you want to test it. You can choose between internal or external storage.
If the app could not detect any SD card, then it will display a "Storage cannot be detected" message, but you are still able to browse it manually (if there is sd card in your device).
After you selected the storage type, choose between write and read test, but firstly always run a write test.
On the first tab (Dashboard), you can see the speed on the speedometer while on the Visualization tab, you can check the current and average speed on the graph.

After the test is finished, on the Results tab you can check the details like processed data, storage path, runtime or speed.
Furthermore, here the app will detect the type of your internal storage (like eMMC or UFS version) and will detect the class for the SD card (like Class 10, UHS-I U1, V10).
Important thing that the app will do these calculation based on the speed, thus it needs at least 4 GB of read or written data and at least 10 seconds of run time, otherwise the result can be misleading.
Finally, you can share the results easily with one-button method.

For professional people:
In the Settings panel, you can adjust the size of the file(s) to read/write, you can change the number of the files (between 1-10).

Good to know:
✔ if the sd card uses FAT/FAT32 file system, the maximum file size can be 4 GB, don't set it higher instead use more files. If you want to use bigger files, format the sd card to exFAT (mostly you can do it using a computer, and don't forget older mobiles do not support it).
✔ If the sd card is formatted as adoptable storage, the app may unable to access it directly. In that case either move the app to the adoptable storage (change the install storage), or format the storage as portable storage.
Updated on
Aug 19, 2023

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
App info and performance and Device or other IDs
Data is encrypted in transit
Data can’t be deleted

Ratings and reviews

4.6
437 reviews
Norm L.
January 30, 2024
Before purchasing, this was suppose to run in the background. I started Verify Written Data and left the app (not closed) worked on other apps. But when I come back after a short while, the app has stopped running. No results. Large 256GB card. MISSED THE REFUND WINDOW. APP DOES NOT WORK IN THE BACKGROUND!
2 people found this review helpful
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raclapp12 PRIVATE
July 1, 2022
Excellent but would add one item of data. With all the minor changes between device variants (see Samsung Galaxy tab s7 plus models for example) .. I would like to see a rating & info for the embedded device card reader. UHS type, etc. It impacts speed rating of the cards tested. Would allow for debugging minor discrepancies for same card across devices. Would also like to see other OS versions...
14 people found this review helpful
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A Google user
November 10, 2019
be careful of the stop button(especially note10+ users). It's right at the bottom edge. If you want to test a large size like 500 gb, you might press on it by accident. Please developer. Put the start and top button in the middle of the screen. Otherwise it's a very good app for verifying your new microsd card.
50 people found this review helpful
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What's new

Fixed crashes on some Samsung devices
Maintenance fixes