Most negotiations are lost in the ten minutes before them, in the negotiator’s head: no written walk-away, no BATNA, no plan for the first number. Fill in six fields and this produces the one-page brief professionals actually use — the zone of possible agreement, the anchor, three concessions you can trade, and the words to say when they open low.

Nothing you type here leaves your browser. And the one rule that beats every tactic in this tool: if you cannot walk away, you are not negotiating, you are hoping — and the other side can smell it.