Open Sinkstack and tap the plus menu. Add a fund from the bundled templates or start one from scratch — set a goal, a contribution amount, a frequency, and an optional due date. Open an envelope to log deposits and withdrawals.
Support
Sinkstack: Sinking Funds Support
Help and contact information for Sinkstack 2.0.
Due-date reminders are optional and on-device. Turn them on for an envelope and the app will ask permission, then alert you 7, 3, and 1 days before the due date. Everything else works without them.
Email the App Store product page with your device model, system version, and a short description of what happened.
Common Questions
Does the app require an account?
No. Sinkstack is fully offline and stores everything on your device.
Can I take money out of an envelope?
Yes. Open an envelope and tap Withdraw. The balance goes down without deleting any history, and revolving funds show refill guidance.
How does the due-date solver work?
Enter a goal and a due date and Sinkstack divides what's left across the contribution periods until then, rounding up so you always reach the goal in time.
Can I export my data?
Yes. Export every envelope and its full ledger to a CSV file from the dashboard menu or Settings.