Captcha solvers mostly have case sensitive option in their api.
You can use it but you might need to go custom with http client.
Is it possible to compare two images if they are same?
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You should go with some node library for images, like >
js-imagediff
pixelmatch
node-opencvGood starting point to explore more deeply about it >
https://stackoverflow.com/questions/4196453/simple-and-fast-method-to-compare-images-for-similarity