A free, interactive sandbox for understanding money. Each tool turns abstract financial decisions into something you can poke at, see, and feel.
🔒 Privacy first. Capibrain doesn't save anything you type — not on your device, not on any server. No cookies, no analytics, no tracking. Your inputs vanish when you close the tab.
Built for learning, not for advice. Real decisions deserve real conversations — talk to someone qualified.
Curious how the stamp duty, grants and building numbers are worked out? See “How the numbers work” at the bottom of the page.