Start here
The free tool below runs entirely in this browser — no account, nothing stored or transmitted. Redact anything you would not want kept before you type it.
Open the companion tool →Why the price is a moving reading
Dynamic pricing changes the offer with conditions you cannot see: your device, your purchase history, your location, or the time of day. Two people looking at the same item can be shown different prices, and both assume theirs is the price.
The comparison steps are simple and revealing: check in a logged-out or different browser, from a different device, or at a different time of day. A price that moves between those is dynamic — and the lower one is the one to buy at.
The protocol
- Note the item, the price, and the conditions — device, login state, time.
- Read the pricing-sign basis: which signs of dynamic pricing are present.
- Run the comparison steps: logged-out browser, different device, different time.
- If the price moves, buy at the lower one, or wait and re-check.
What the tool does
Review a purchase and get a pricing-sign reading with the comparison steps that reveal dynamic pricing. It runs in this browser; nothing is sent or stored.
Limit first: This is a comparison aid, not a guarantee about any seller's pricing. Price differences can also be innocent; the steps reveal variation, not wrongdoing.
Open the companion tool →One human next step
Run the comparison steps before a big purchase. If a price difference looks deceptive, file with the FTC.
Research log and safety checks
AI-assist path: not applicable — the comparison steps are the whole tool and must be run by the reader on their own devices; a model cannot see the prices. §6.10: not a frontier-pace topic.
§0.5 protection result: category is financial-agent-exposure; crisis-adjacent: no; fear/urgency/scarcity toolkit used: no. The protective function is free and the paid feature is convenience only.