Hey HN, I built this.

The idea: what if you could red-team any business decision the way security teams red-team software?

You describe a decision. NEXUS builds a virtual world with 1,000+ AI stakeholders — each with distinct personality, expertise, and social influence. They post opinions, argue, form coalitions, and create cascading reactions over 15-25 rounds.

Then you can do two things no other tool offers:

1) Chat with any agent afterward. Click on a skeptical investor and ask "why did you change your mind in round 12?" — they explain their reasoning referencing specific arguments from other agents.

2) What-If. Change any variable. The entire simulation re-runs with 1,000 agents re-evaluating from scratch. One variable change can flip the verdict completely — I've seen sentiment swing from -0.40 to +0.35 on a single parameter change.

The engine uses bounded confidence dynamics, influence propagation, and adversarial protocols (Devil's Advocate every 3 rounds forces the simulation to attack its own conclusions).

Most of the "1,000 agents" are NOT LLM calls — the crowd tier uses zero-LLM behavioral models based on Big Five personality distributions. That's how we keep it at consumer pricing.

Free tier available — would love brutal feedback from HN.