I’m not enamored with Scanner Pro, and have said that I’d switch in a heartbeat if something consistently beats its photo algorithms, because the only thing that matters is the final PDF quality.
I’ve bought and tried Scanbot and the rest of the top 10 of popular scanning apps, until settling for the one and only original. This has been the experience of a lot of other people too.
The competitors’ GUIs can trick one into thinking “wow, Scanbot has a techy GUI and must therefore be very advanced”, but having an advanced-looking GUI doesn’t translate into having advanced photo DSP algorithms under the hood. Scanbot is okay. But the PDF results are most consistently the best in Scanner Pro - with the fastest edge detection, cleanest distortion correction, most accurate white balance, shadow removal, etc. And a very nice GUI too. I’ll switch if something ever beats it.
As for Scanbot being the first to come up with the workflows idea: That’s possibly true. Does it matter who came up with something? In that case I could correctly say that Scanner Pro came up with the whole idea of scanning via the phone on iOS (they were the first). Does that discredit all competitors cloning it? Of course not. All I care about is who does it best. Because once the scan is done, you’re no longer looking at some fancy app GUI. You’re looking at a PDF. And it better be perfect! 