Keep CBLEsim free

CBLEsim is built and run by one independent developer: every question, every explanation, the forum and the server it all runs on. There is no company behind it and no paid tier, and your data is never sold.

Running it costs money every month: the server, the domain and email delivery. If CBLEsim helped you study, a one-time coffee helps cover those costs and keeps it free for the next person sitting the exam.

Tips are handled on Ko-fi's site by Ko-fi and its payment processor; CBLEsim never sees your card. A tip is voluntary and buys nothing: everything on the site stays free whether you contribute or not. CBLEsim is not a charity, so contributions are not tax-deductible.