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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
The total size of the download seems to be 3-4MB (based on https://github.com/naptha/tesseract.js/blob/master/docs/loca...), which is less than I expected.
Being disappointed by classic open source OCR I started an attempt to package neural net based based approaches (https://github.com/gtsoukas/scene_text, don't use it, it is crap), then I found out that Googles' ML Kit (https://developers.google.com/ml-kit/vision/text-recognition) gives quite good results, as long as it is for latin based character sets.
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