Hedy

It sees text, not intent, and it is sold as though it sees intent.

Adding a practical test for anyone evaluating one of these: run your own last thousand real inputs through it and count both error directions. Vendors publish the miss rate and rarely the false-positive rate, and in production the false positives are what people actually complain about.

Ours blocked a legitimate support message in about one in forty. That number decided it, not the benchmark on the page.