Privacy policy

Expense Splitter · last updated 17 September 2026

Expense Splitter is a private application used by two people. It is not offered to the public and has no users other than the household that runs it. It runs on a personal computer and stores its data in a file on that computer.

Google account data

The application requests one Google permission: https://www.googleapis.com/auth/gmail.send.

• What it accesses. The ability to send mail as the Google account that granted permission. This permission does not give access to the contents of that mailbox, and the application does not read, modify, delete, or download any message, contact, label or setting.
• How it is used. Solely to send the application's own notification emails — a daily summary, a note when one partner shares an expense, and a monthly statement — to the two members of the household.
• How it is stored. Google returns an OAuth refresh token, which is written to a single file on the computer that runs the application, readable only by that computer's owner. No Google account data of any other kind is stored.
• How it is shared. It is not. The token is never transmitted anywhere except to Google, in order to send those emails. Nothing is sold, and there are no third-party analytics, advertising or tracking services.
• How it is retained and deleted. The token remains on that computer until it is deleted or revoked. Revoking the application at myaccount.google.com/permissions ends its access immediately.

Limited use

Expense Splitter's use and transfer of information received from Google APIs adheres to the Google API Services User Data Policy, including the Limited Use requirements.

Financial data

Bank transactions are retrieved through SimpleFIN, a read-only banking interface. The application cannot move money and never sees a bank password. The SimpleFIN credential is encrypted before it is stored, and transactions are held in a local database file on the same personal computer. No financial data is sent to any third party.

Email content

The emails the application sends go only to the two members of the household. Each partner's email contains their own transactions and only those expenses the other partner has explicitly chosen to share.

Children

The application is not directed at children and collects nothing from them.

Changes

Any change to this policy will be published on this page with a new date above.

Contact

jack@flintsparkhq.com