The demo is available for free. We are charging a subscription fee for a customized version of the tool

Unpaywall Journals is a project from Our Research, a 501(c)3 nonprofit. Like everything we build, Unpaywall Journals is built using Open Source code, an open data API, and an accessible, sustainable pricing model. We want all institutions to be able to afford this tool. To achieve this, we are setting the introductory price at $1000/year (US dollars) -- less than the price of a single article APC or single journal subscription. In return for this, your institution becomes a supporter of Open Infrastructure, a partner in Unpaywall Journals, gets an Unpaywall Journals dashboard customized to your institution. You will be able to upload your own COUNTER stats, subscription history, and price lists. We'll use this information to customize the usage, open access percentages, citations, authorships, and prices for your university. If your institution would like to contribute more, we will gladly accept donations and will use that money to continue making tools and data as openly available as possible.

You can buy a subscription here now, with a P-card (credit card):

If you need an invoice or to pay by bank transfer, send an email with all data you need to appear on the invoice to (currently no fee for this -- please only chose this option if you are not able to pay by credit card).