Stacks: Notebooks for Life

Stacks is the honest, private notebook for your money and the rest of your life. No account, no bank login, no ads. Everything you write stays on your phone.

Most money apps want to link your bank and sell you optimism. Stacks does the opposite: you keep your data, and it quietly tells you the truth.

See where your money really goes
The Money Dashboard shows your month at a glance, and the Honest Mirror surfaces what the numbers won't sugarcoat: a subscription about to renew, spending that's creeping up, the recurring charges you've stopped using.

Catch the subscriptions draining you
Stacks adds up your bills, shows their true monthly and yearly cost, and reminds you before each one renews, so you can decide whether to keep it before you're charged again.

Know what everything really costs
Track grocery prices over time and notice when your regulars creep up. No receipts needed, just log a price when you spot it.

Always know what's left to spend
Income, expenses, and what you set aside, with a clear "left to spend." No spreadsheets, no setup, no friction.

Not just money
Stacks is a notebook for every part of your life: groceries, bills, the gym, your health, a course, a project, anything worth keeping track of. Each notebook is built for what it holds.

Go deeper with Premium
A one-time unlock, yours for life, no subscription. Choose a companion, Otto, Katie, Duffy or Finn, who reads every month with you in their own voice and writes you a short letter when the month closes, kept for years. Premium also opens the full Honest Mirror, a look at where your habits are heading, camera receipt scanning, and CSV export.

Private by default
No sign-up. No cloud. No tracking. Your data never leaves your device unless you choose to export a backup, which you can carry to a new phone in one file.

Stacks. Notebooks for life.