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cFIREsim vs Boldin: catalog facts
cFIREsim	Boldin
Free Free to use in the browser.	Freemium Can be tried for free, with additional features to unlock; prices are not stated here.
Web	Web
Tests withdrawal plans against historical data Runs in the browser with nothing to install	Detailed modelling of taxes, income, property and healthcare What-if scenarios and Monte Carlo analysis
Focused on US retirement planning Detailed tax modelling lives on the separate FIREproof site	Cloud service that holds your financial data Oriented toward US retirement rules
Web application	Web application, Hosted service
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.