The best alternatives to LetterScan are ABBYY, Skimm'Olympics, and ABBYY TextGrabber 6. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— Speech-to-Text API with superhuman accuracy
ABBYY Digital Intelligence platform is designed to allow organizations to deploy solutions in standalone configurations or as a tightly integrated extension of industry-leading RPA, BPM, and packaged application solutions.
TextGrabber quickly digitizes fragments of printed text and turns the recognized result into action: call, email, follow links, translate into 100+ languages and many more. The app captures and recognizes information even without connecting to the Internet.