Cheers. The app is built for Mavericks only since it is using SwiftUI, PDFKit, Vision, and other latest Apple API goodies. Not all of these unfortunately support earlier OS versions.
I was intrigued by SwiftUI last summer and have been building this app up for a while. The first version was released about a month ago and I just released the third version this week. The TLDR version is that it is a simple OCR application for on-device OCR that can handle image files, pdf files, screenshots and iOS photos/scans. The OCR is done using Apple's Vision framework.
The app is built for Mavericks only since it is using SwiftUI, PDFKit, Vision, and other latest Apple API goodies.
The application is still free at the moment, but I'm planning to add some fair business model to it in the near-future so I could put in the time to maintain and improve it. I'll be super grateful to get any feedback regarding the application!