Terms of use

Underfolio is market history: a research lab (the Market Lab, the chart lab, the Graveyard) and a game about the past. Nothing here is investment advice, and nothing here predicts anything.
The market data is licensed to Crystl Labs for use inside this site. You may read it, chart it, test rules on it and play with it here, for your own use or your class. You may not copy, download, crawl or collect prices, news, results or research output by any automated means (bots, scripts, headless browsers, or calling the API directly), and you may not share or resell anything you pull from the site.
Don't try to get around rate limits, bot checks or access controls. We may block devices, accounts or networks that break these rules, and remove their results from the boards.
The Daily Drop can be played without an account. Your browser keeps a random id and we keep that id with your result, so one browser plays once a day; signing up later moves those results into your account. Everything else needs a free account.
One account per person. Players under 13 join through a teacher's class code and have no account of their own.
Pro is a one-time payment for a fixed time (a month or a year). Nothing renews by itself; paying again adds time. Classroom seats are paid per student for a year.
Prices, data coverage and features can change. We will say so on the site when they do.

Support, payments and refunds

Paid but Pro didn't unlock? Open the Pro page and press Check payment. If it still isn't there after a few minutes, email [email protected] with your PayPal receipt and the email or name on your account.
Refunds are handled by email, case by case: write to [email protected] within 14 days of the payment.
Something wrong with a number, a chart or an obituary? Email [email protected] with the page address and what you expected; corrections are noted on the page.
To delete your account, use the Delete account button on your account page. Scores already on public boards stay, with no link to you.