An offline sinking-funds envelope tracker for irregular bills — save per paycheck, hit your due dates, and refill revolving funds without losing your history.
Choose weekly, biweekly, semimonthly, monthly, quarterly, or annual contributions. Sinkstack projects when each envelope will be fully funded at that pace, and a due-date solver tells you exactly how much to put in each paycheck to make a deadline — plus a catch-up amount when you fall behind.
Per-paycheck contribution frequencies, a due-date "required contribution" solver, withdrawals and revolving funds, optional local reminders, a category-grouped dashboard, an edit screen, a 16-color palette, balance charts, and CSV export of every envelope and its full ledger. Everything runs on-device.