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I've spent a fair amount of time researching all of the existing online options and the Collins English Thesaurus is by far one of the best:
https://www.collinsdictionary.com/us/dictionary/english-thes...
They also still offer a generous free-tier for their API, unlike Oxford, which discontinued its free-tier after introducing version 2 of their API.
When I find some more free time, I plan to modify the org-mode emacs package for the Merriam-Webster's thesaurus to use the Collins API:
https://github.com/agzam/mw-thesaurus.el
Carefulwords.com looks nice and improves on existing website-based thesauri in terms of usability, but for many writers, having the thesaurus built into their writing tool (e.g., emacs) is a far more efficient option.