Short version: no accounts, no cookies, no personal data, and no cross-site tracking. Yesterday's Priceis a game — it doesn't need to know who you are, so it doesn't ask.
What stays on your device
The game keeps your progress in your browser's localStorage— never on a server, because there isn't one. That's where your current puzzle, your streak, and your stats live. Clearing your browser storage erases all of it, and it never syncs to another device.
- Your guesses, results, and streak for each day.
- An anonymous identifier — a random string, not tied to your name or email — that lets us tell whether people come back day to day.
What we measure
We track a deliberately tiny set of anonymous events — a puzzle starting, a guess, a win or loss, a share, opening your stats — through PostHog, our analytics provider. It's enough to answer one question: is the game worth making? The anonymous identifier above is what makes “did they come back tomorrow?” answerable without ever knowing who they are.
There are no cookiesand therefore no cookie banner. When you share your grid, the link carries a tag so we can see a visit came from a share — that's the extent of it. We don't follow you across other sites, we don't build a profile, and we don't sell or share data with advertisers.
Questions
If anything here is unclear, email us at support@whey.dev.