Is the Value Proposition Generator free?
Every account gets one free run, then it's 1 credit each (free monthly credits cover normal use).
Will it invent claims about my business?
No. It works from what you provide plus general best practice, and never invents statistics, awards, '#1' claims or results. Where a real specific would sharpen a line but isn't given, it leaves a [bracketed] blank for you to fill truthfully.
What's the difference between the value prop and the positioning statement?
The value proposition is the customer-facing promise (what outcome you deliver). The positioning statement is an internal template — 'For [audience] who [need], [brand] is a [category] that [benefit], unlike [alternative]' — that keeps your whole team aligned on where you sit in the market.