Keep the numbers free for everyone
55993 is free, private and ad-light by design. Your support pays for operations, builds new tools, funds contest prizes, hires talented writers, developers and creators, and helps more people find the site.
Supporter
Buy the servers a coffee.
Champion
Funds a new calculator.
Patron
Sponsors a monthly contest prize.
Founding Partner
Logo on our supporters wall + newsletter shout-out.
Where every dollar goes
Target allocation of supporter funds. We'll publish a short report each quarter.
Pledge or sponsor
Prefer bank transfer, invoice, crypto, a recurring gift or an in-kind sponsorship (prizes, software, services)? Pledge here and we'll reply with secure payment details.
Supporters wall
Our first supporters will be listed here with their permission. Be the first name on the wall.
Questions
Is my donation tax-deductible?
55993 is not a registered charity, so donations are generally not tax-deductible. Business sponsorships may be deductible as marketing — ask your accountant.
Can I cancel a recurring gift?
Yes, anytime — just reply to any receipt or use the contact page.
Can my company sponsor a contest prize?
Absolutely. Choose “In-kind sponsorship” above or visit the advertise page.