Recommend a good AI summarizer tool

Is there any summarizer tool where I can select the words that cannot be changed and the rest will be summarized?

Please recommend aside from quillbot.

I tested a lot of tools, none is as good as quillbot. most are just taking the first few sentences and don't really "understand" the text. would love to hear about an alternative, although quillbot is pretty cheap on a yearly subscription. the problem with quillbot they dont have API for mass operations

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