Choose camera orientation for Android devices
On my Asus Android tablet, scanning Plickers worked, but every 'A'-answer was registered as a 'D' (and B became A; C became B; and D became C).
It was only after the session that I figured out that this was probably because i used the tablet in landscape.
If it's not possible to change it, a warning 'like keep this side up' might be helpful (now I only saw the warning about keeping the camera vertical)

Fixed! The new Android update lets you “Rotate answers” to choose the camera orientation – make sure you update your app!
What to do if your device is scanning answers incorrectly:
1. Download and install the updated Android app from the Play store
2. Navigate to the Plickers camera screen (you’ll need to choose a class and add a question)
3. Scan a card and confirm that the answer is incorrect
4. Press the menu button (3 squares) in the bottom-right. Use the “Rotate answers” button until the answer scans correctly.
Let us know if you have any trouble!
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Brendan Mattingly commented
This issue seems to be back with the newest update.
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Anonymous commented
I used the app last year without any problem. With the update of this year I can't rotate the answers. How can I do it?
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AdminNolan Amy (Founder, Plickers) commented
Some android tablets have this issue. For now, the only way to solve it (because the app compensates for how you tilt your android device) is to have the students hold their cards with their chosen answer on the side (right or left, depending on the device).
We'll add this option in Settings on the upcoming update. Thanks for the reminder!
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Luc Ruivard commented
My friend have the same probleme on Galaxy Note10 ! This is very problematic !