Your Account
Optional sign-in for cross-device sync. Every calculator works without it.
Checking your session…
Sign in or create an account
No password to invent — we email you a one-time sign-in link, and you can add a passkey afterwards for one-tap sign-in.
What an account adds: your saved numbers and snapshot history sync across your devices — that's it.
What it never does: no bank connections, no passwords stored, no data sold. Figures are self-reported — you type them, you own them.
You're signed in
Signed in as
Plan & billing
Checking your plan…
Scenarios
Saved sets of numbers you can switch between — "Me", "Partner", "If we buy the condo". Every calculator reads the active scenario. Scenarios live in this browser; when you're signed in, "Sync now" backs them up too.
How your data is handled
- 🏠 Local-first — your browser is the source of truth. Sync only keeps an encrypted-in-transit copy so other devices can pull your numbers.
- ✋ Opt-in — nothing leaves this device unless you press "Sync now". Figures are self-reported; we never connect to your bank.
- 🗑️ Deletable — you can delete everything at any time: the server copy, your account, or both.
Full details in our privacy policy.