Suprmind is a solid alternative to ChatHub starting at $19 per month for the...

https://tango-wiki.win/index.php/ChatHub_vs_Suprmind_for_Product_Managers_Doing_Tradeoff_Decisions

Suprmind is a solid alternative to ChatHub starting at $19 per month for the Spark plan. It offers six distinct modes to tailor your chats, a Decision Validation Engine to double-check your conclusions, and a Red Team feature to spot flaws