How does BidWix work?

One side submits a secret price. They share a 6-character code with the other party, who submits their own secret price. BidWix calculates a fair deal price using the geometric mean.

Yes. BidWix is completely free to use. No account required, no email required.

Why is the geometric mean fair?

The geometric mean ensures both buyer and seller benefit by the same proportional factor, so neither side gets a better deal than the other.

The fast, fair way to agree on a price.

I want to SELL I'm the seller — I'll set my floor price

I want to BUY I'm the buyer — I'll set my highest offer

I have a CODE

How it Works

One side starts

Seller or buyer — either can initiate. Describe what you're negotiating and submit your secret price.

Share the code

Send the unique BidWix code to the other party — by email, text, carrier pigeon, or however you like.

The other side submits

They enter their own secret price — without knowing yours.

BidWix reveals the result

If a deal is possible, BidWix suggests a price that's mathematically fair to both sides. If not: no deal, no hard feelings.

Why it's fair

BidWix is inspired by principles of game theory. Like a Nash equilibrium, the system is designed so that honesty is your best strategy — there's no advantage to bluffing when you only get one chance and your price stays secret. The deal price is the geometric mean of both offers, ensuring that buyer and seller each benefit by the same proportional factor. That's mathematical fairness.

Chloe & Ben

Chloe just opened a small bakery and needs a logo. Ben is a freelance designer whose work she loves. But how much should a logo cost? Neither wants to go first.

Ben's absolute minimum for the work is $100. Chloe could stretch to $900 if she absolutely had to. That's her honest maximum.

They use BidWix to each submit their true limit price in secret.

Result: $300.

Ben earns three times his minimum. Chloe pays a third of what she feared. Both gained by the same factor, so both feel equally happy about the deal they made.

That's the geometric mean at work. No awkward back-and-forth — just a fair price, found in one step.

Privacy by design

BidWix works with a simple 6-character code shared between two people. No account needed. No email required. If you choose to provide one, it's only used to send a copy of your code and notify you of the result — nothing else. I don't sell data, build profiles, or collect more than what's needed to run the deal. You can learn more about me and BidWix in the article section below.