I want to implement offline handwriting ocr within an application. It should work on photographs of handwritings (=no scanned images). I tried tesseract and Google Cloud Vision. Both seem not to work well with handwritings.

Are there any handwriting specialized APIs/libraries with high accuracy? I would like to use something finished – the focus of the project should not be on building/training a model. Whats the state of the art in that specific area?

Ive searched around a little bit but couldnt find anything suitable.

Thankful for every hint I get.