Big Tree Publications
Shrink Books
Bookkeeping built for a therapy practice, not a corporation. Client ledgers, a one-click monthly billing run, invoices and superbills that look like your letterhead, and not one byte of it on someone else's server.
This is Shrinky. He also answers questions inside the app.
What it does
The month-end job, in about a minute.
A ledger for every client
Sessions, payments, fees, and the running balance, laid out the way you actually think about them. Payments allocate to the months they cover, so what a client owes for March stays attached to March.
Invoices and superbills
Real PDFs on your own letterhead, with your credential, license number, NPI, diagnosis, and CPT codes already in place. Print them, save them, or send them as a Mail draft you get to read before it goes.
Your calendar already knows
Shrink Books reads your work calendar, matches events to clients, and proposes the sessions for you to confirm. Longer appointments bill proportionally. Nothing is recorded without your review.
Payments that record themselves
The app watches a mailbox for Venmo, Zelle, and PayPal receipts, matches each one to a client, and offers it up for one-click recording. Take cards and bank transfers through Stripe if you want to, with durable payment links right in the invoice.
The numbers, at a glance
A dashboard that tells you what you earned, what is outstanding, and what is past due, month by month. Year summaries and CSV exports for whoever does your taxes.
Ask Shrinky
A built-in assistant who knows how the app works and can answer questions about your own books. He is careful about boundaries: no legal, tax, or clinical advice, and he asks you to keep client names out of the chat.
Your records
Built for notes that must not leak.
A therapy practice keeps protected health information. That shaped the whole design: there is no cloud account behind this app, and there is no server that could be breached, subpoenaed, or sold.
- ✓Encrypted at rest. Your books are stored as an AES-GCM encrypted file in your own home folder, with the key in your Mac's Keychain.
- ✓No accounts, no server. There is nothing to sign up for and nowhere for your data to go.
- ✓Thirty days of backups. Kept locally, encrypted, rotating daily.
- ✓Two Macs, if you want. Optional sync between your own machines through your own iCloud Drive, encrypted in transit and at rest. Off by default.
- ✓Signed and notarized by Apple. The build you download is the build that was checked.
Try the beta
Shrink Books is in a private beta with working therapists. Builds go out by hand so I can hear what breaks. Send a note and I will send you a disk image and a way to reach me when something is wrong.
Version 0.9, macOS 15 or later. Delivered as a signed, notarized disk image.