Sinkstack: Sinking Funds Privacy Policy
Effective date: June 13, 2026. This policy explains how Sinkstack handles data.
Data Handling
Sinkstack is an on-device app. Your envelopes and contribution history are stored only on your device, in the app's own storage. Sinkstack has no account system, no servers, and makes no network requests. Nothing is uploaded, synced, or shared unless you choose to export it yourself.
Bundled Content
The starter templates, category list, and the in-app explainer ship inside the app. They are static reference content and do not collect any user data. Goal suggestions in templates are general planning estimates, not financial advice.
Notifications
Due-date reminders are optional. If you enable them, the app schedules local notifications on your device using the system notification framework — no push server is involved and no data leaves the device. You can turn reminders off at any time, and every other feature works whether or not notifications are granted.
Tracking and Third Parties
Sinkstack does not track you across apps or websites, contains no analytics or advertising SDKs, and has no third-party services.
Export
You can export your envelopes and ledger to a CSV file using the iOS share sheet. Where that file goes after you share it is controlled entirely by you and the destination you pick.
Contact
Questions can be sent to the App Store product page.