Keep PSI going
A one-off gift. Or lasting support.
Choose an amount that suits you. Every contribution helps preserve free access to knowledge, without advertising or a required account.
- Support ongoing operations or a specific goal.
- Contribute once or renew your support each year.
- See how funds are used without publishing your identity.
Manage or cancel my annual support →
Sign in to Stripe with the email address used for your donation. You can update your payment method, view your receipts and stop the next annual renewal. Cancellation takes effect at the end of the period already paid for.
Why are reference amounts shown in dollars?
The US dollar provides a common reference: most readers can roughly relate its value to their own currency. Estimates are therefore shown in US dollars. For your donation, you choose the amount and an available currency. The amount and currency charged are displayed before confirmation.
What about donor information?
PSI does not build donor profiles or link donations to votes or guestbook messages. References needed for financial tracking are retained. The payment provider processes the information needed for the transaction.
In general, PSI excludes recording personal data and does not compile statistics about its users.