A1 SD Bench

14.9K reviews
Content rating
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About this app

*** IMPORTANT - If your SD card is not detected, please send us your model and SD card location, before giving a rating. We can not test this app on all devices ***

Use A1 SD Bench - free tool to benchmark your phone & tablet SD card, RAM and memory, to test IO read / write speed (Quick, Long, Random I/O and Accurate) and check media performance, and compare your benchmark results online.

★ Free
★ Four benchmark modes - Quick, Longer, Accurate and Random I/O
★ Built-in compare results online (anonymous)
★ Built-in view statistics online
★ SD card speed test, or multiple SD cards
★ Speed test any Android storage including RAM and USB
★ Nice looking, clean, fast, responsive & intuitive UI (User Interface)
★ Measure both read and write speeds to find out how fast is your SD card
★ Quick and Accurate benchmark (to reduce caching effects)
★ Check your speed-test results with other devices
★ Speed categories: Class 2, Class 4, Class 6, Class 10, UHS-I, UHS-II and UHS-III
★ Custom location option to test any device directory
★ Shows total and free memory for all media including RAM

Supported devices:
• Internal memory
• Internal SD cards
• External SD cards
• System RAM (Random access memory)
• USB flash drive (including, NAND flash, USB 1.0, USB 2.0, USB 3.0)
• Up to 6 USB flash drives (connected simultaneously via USB hub)
• USB HDD (Hard drives)

Supported memory cards:
• SD Cards
• Micro SD
• Micro SDHC
• Micro SDXC
• Phone's built-in memory (card)

• Problem? Please, send us your feedback using Send Feedback feature from the Settings screen, or http://a1dev.com/feedback/
• We can not test all Android devices, so if your device's memory / SD card / USB is not detected correctly, use Send Feedback feature from the Settings screen, specifying path to your storage, e.g. /mnt/sdcard/, /mnt/usb_drive;
• NTFS and other non-native file systems is supported as far as your Android device is compatible with a such FS.
• Your device needs enough free (100 MB and up, depending on media speed, and up to few GB if using longer test option) space for benchmarks to work;
• More: http://a1dev.com/sd-bench/notes/

More info on permissions:
• "Storage" & "Media" is used to benchmark your device storage, SD cards and USB attached drives.
• "Internet" is used to access and submit online scores and for anonymous usage statistics (both can be enabled and disabled).
Updated on
Mar 11, 2021

Data safety

Developers can show information here about how their app collects and uses your data. Learn more about data safety
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14.9K reviews
Joe Meloche
January 27, 2022
The GUI is easy to understand, and lifts expectations. It doesn't recognize external storage. I opened settings, and checked the box for showing alternative locations with no success. I mostly desire the performance statistics of my external storage drives and cards so I may use the best in my high demand devices like UHD video capture. USB booting an OS is another high performance situation. If this app were test more than just RAM and Internal storage, then it may gain popularity.
11 people found this review helpful
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David Heath
February 26, 2022
Excellent! Just what i wanted. Would be nice if this was on the android TV store, i could just about run it on the shield when it was slide loaded. Thank you! Crystal mark for the pc gives you a choice of sequential and random. Would be nice to see the best and the worse readings. My USB stick was close to 0Mb/s on the random but 70 Mb/s on the sequential The SSD was worth the extra although a bit over kill. But this app proved it.
10 people found this review helpful
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A Google user
April 6, 2020
Just installed after being very happy with it a year or two ago. Now utter, messy, unreliable rubbish. Won't properly bench my Samsung s7 phone's external sd card anymore, write result 0.0mb/s and missing from the results or corrupted. Did an accurate bench with restart and just as bad. App started recording results then just messed everything up each time I ran it so had to uninstall. Wish I could download the old version !
45 people found this review helpful
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What's new

Fixes issue with incorrect write speed shown.