QR codes were invented at Toyota in the 1990s IIRC. They're extremely well-documented and supported. I've been using that reader for about 10 years, it still w

QR codes were invented at Toyota in the 1990s IIRC. They're extremely well-documented and supported. I've been using that reader for about 10 years, it still works great despite seeing few updates: https://f-droid.org/packages/com.google.zxing.client.android https://f-droid.org/packages/com.google.zxing.client.android There may be quicker, prettier or more featureful apps, but this one serves my needs. I use zbarcam on my PC.