If you just want effective and free and don’t care about open, Google’s is the best https://developers.google.com/ml-kit/vision/barcode-scanning https://develop

If you just want effective and free and don’t care about open, Google’s is the best https://developers.google.com/ml-kit/vision/barcode-scanning https://developers.google.com/ml-kit/vision/barcode-scanning Also depending on your application you could buy a hardware scanner like https://www.zebra.com/us/en/products/scanners/fixed-mount-scanners/ds457.html https://www.zebra.com/us/en/products/scanners/fixed-mount-sc... for cheap secondhand since they are all over retail. The protocol can be as simple as it “types” the barcode over USB HID like a keyboard, or there are more specialized modes.