Bidders and sellers both work from a phone. It's a web app, so there's no store review, no install, and no version to chase.
Auctioneer software — The bidding engine, the closing rules, the invoicing and the settlement — the parts an auction actually needs to be an auction.
White-label software — The same engine under your brand and your domain, with your fees — customers never see ours.
Custom shop listing — Not everything should go to auction. Fixed-price stock lives in the same catalogue, under the same account and the same protections.