Device Checkup

What it does

Features

• What your SD card says

  Maker, name, production date, size and serial number, with a warning when the maker or name looks wrong for the size.

• Speed test

  Writes a 256 MB test file, reads it back and shows the real speed in MB/s. About a minute.

• Quick check

  Writes 1 GB of test data and checks every byte. Finds failing cards in a few minutes.

• Full check: fake cards

  Fills the free space with test data and checks it all. Cards that claim more space than they have are caught.

• Buttons & sticks

  Every button lights up when pressed; the sticks show drift at rest and how far they reach.

• Stick lights

  The RGB lights around the sticks in red, green, blue and white, then each side alone: a missing colour means a failed LED. Your muOS light setting comes back afterwards.

• Battery health

  Charge, voltage, current, temperature and, when the handheld reports it, capacity vs. new and charge cycles. Plus a 10-minute drain test.

• Speaker test

  A tone on the left, right or both speakers, and a sweep from low to high that makes rattles and buzzing easy to hear.

• Screen test

  The whole screen in black, white, red, green, blue and grey, one at a time: dead and stuck pixels stand out.

• Your files stay safe

  Tests use their own hidden folder in free space and clean up after themselves, even after a crash or flat battery.

• Report by email

  Send this session's results to your email as a ZIP locked with a password you choose on the handheld. pocketkode.com passes it on and doesn't keep it.

Price

Free, every test included

Everything in Device Checkup is free: every test, the battery report and Send report to email. There's no trial, no account, no activation and no subscription. Device Checkup is closed-source software by PocketKode under the PocketKode Software License.

Screenshots

On the handheld

Screenshots from muOS on the Anbernic RG40XXH. Other systems may look a little different.

Install

How to install

Good to know

• Your files are never touched. Test data goes into its own hidden folder in free space and is deleted afterwards.
• SD card 1 keeps 2 GB free so muOS keeps working. A new card is best tested in slot 2.
• Plug in the charger for a full check (about 1 hour per 20 to 40 GB free). The screen stays on, and the test stops by itself if the battery gets very low.
• If a check says data came back wrong, don't keep games or saves on that card. H2testw (Windows) or F3 (Mac, Linux) can confirm it on a computer.

Transparency

Privacy & data

• ✅Never reads or sends your files, games or saves; SD card tests use their own test data
• 📡pocketkode.com: the update check (the handheld model and the app version; you can turn it off in About)
• 📡A report only when you choose Send report to email: a ZIP locked with your password, which PocketKode can’t open, emailed to the address you type (through Resend) and not kept
• 🚫No ads, no analytics, no tracking in the app

The same list is in the app (About → A Privacy) and in its README. More on the privacy page.