Privacy Policy

Last updated: November 1, 2026

Billfinch helps small session-based businesses — tutors, trainers, coaches — turn their calendar into bills: tracking sessions, prepaid packages, invoices and payments. This policy explains what information Billfinch collects and how it is used, in plain language.

What we collect

Account information — your email address and name when you sign in, directly or with Google or Apple.
Business information — what you enter to run your business in Billfinch: your business name, rates, payment instructions, the families or clients you bill (names, phone numbers, email addresses), students, sessions, packages, invoices and payments you record.
Calendar information, only if you connect a calendar — see below.
Basic technical data — logs needed to operate and secure the service.

Calendar data (Google Calendar and calendar links)

If you connect Google Calendar, Billfinch asks for read-only access (calendar.readonly). If you add a calendar by its private iCal link, Billfinch reads that link the same way. Either way, Billfinch reads events from roughly four months back to two months ahead and stores, for each event: its time and length, title, guests' email addresses, and whether it has a video-call link. It uses these only to create and update sessions in your Billfinch account and to suggest which student an event belongs to. Billfinch never changes, creates or deletes anything in your calendar.

Access tokens and calendar links are stored encrypted on our servers and are never sent to your devices. You can disconnect at any time: remove the calendar in Billfinch → Settings → Calendars, and (for Google) revoke access at myaccount.google.com/permissions.

Billfinch's use and transfer to any other app of information received from Google APIs will adhere to the Google API Services User Data Policy, including the Limited Use requirements. Google user data is not used for advertising, is not sold, and is not used to train AI models.

How we use it

To provide the product: syncing your data across your devices, importing sessions, working out what is owed, and producing invoices.
To send email you'd expect, such as sign-in codes. No marketing email.

We do not sell your data or share it with advertisers. There are no ads in Billfinch.

Your clients' information

The business using Billfinch decides which client information to enter and is responsible for having it. Billfinch processes it only on that business's behalf, to provide the service. Invoices are shared by the business itself (for example by text message); Billfinch does not contact your clients.

Services we rely on

Supabase — database, sign-in, and server functions (hosted in the United States).
Cloudflare — website and app hosting.
Resend — sending sign-in email.
Google and Apple — optional sign-in, and Google Calendar if you connect it.

Data retention and deletion

Your data is kept while your account is active. You can permanently delete your account and all of its data at any time in the app: Settings → Delete account. This removes your business and everything in it — families, students, sessions, packages, invoices, payments and any stored calendar access — immediately. You can also email support@billfinch.app from the address you sign in with, and we will delete it within 30 days. Removing a calendar in Billfinch stops all access to it immediately.

Changes

If this policy changes materially, we'll update this page and the date above.

Contact

Questions? Email support@billfinch.app.