Ptolemy Solo
NL EN
Coming soon to the App Store

Your whole bookkeeping.
On your iPhone. No account.

Ptolemy Solo is a full set of books for a one-person business — invoices, receipts, VAT, bank and reports. Everything runs locally on your device, so your books stay yours.

  • Works offline
  • No account needed
  • Double-entry on the RGS MKB chart

One email at launch. Nothing else, and you can unsubscribe any time.

Why Ptolemy Solo

Accounting software that doesn't ask for your data

Most packages put your administration in their cloud and bill you monthly for it. Ptolemy Solo runs on your phone.

Your books stay yours

The administration lives in a local database on your iPhone and rides along in your normal iCloud device backup. No account, no accounting cloud, nobody looking over your shoulder.

Real bookkeeping, not a spreadsheet

Double-entry accounting on an append-only ledger using the Dutch RGS MKB chart of accounts. Profit & loss, balance sheet, trial balance and journal all derive straight from posted entries.

Built for the Dutch solo entrepreneur

VAT mapped to the boxes of the Dutch return, KOR support, mileage logging and time tracking. For your bookkeeper you export an XAF 3.2 audit file.

What's inside

Everything a one-person business needs

From the first order to the quarterly VAT return — in one app, without stitching tools together.

Invoices & orders

Draft to issued to voided, with clean PDF templates, payment terms and payment methods. You send them from your own mail.

Expenses & receipts

Record costs with the receipt attached. With Pro you scan a receipt and the supplier, amount, date and VAT are read out automatically.

Quarterly VAT

Every posting lands in the right box of the Dutch return, so your filing is prepared as you go. KOR supported.

Bank & card reconciliation

Import CAMT, CSV or a PDF statement and match it against your invoices and expenses. Suspense accounts keep your liquidity honest.

Fixed assets

Investments with automatic depreciation and clean handling when you sell or dispose of them.

Projects & time

Log hours per project, by hand or automatically through a geofence around the client's location — so the 1,225-hour criterion stays in view.

Mileage log

Record and review business trips, ready to carry into your tax return.

Reports

Profit & loss, balance sheet, trial balance and the full journal — always derived from the ledger, never kept on the side.

Dashboard with alerts

Your result and VAT position on one screen, with notifications for overdue invoices, drafts near month-end and the return that's coming due.

Business partners

Customers and suppliers with roles, addresses and per-relation insight. Syncs in from your Contacts.

Backup & export

A full backup you can restore, plus an XAF 3.2 audit file and JSON for your bookkeeper.

Dutch and English

The whole app is available in both languages and follows your device's language.

Pricing

The bookkeeping is free

You only pay if you want receipt scanning — that part runs in the cloud.

Ptolemy Solo

Free — no account
  • Invoices, orders and PDF export
  • Expenses, VAT and KOR
  • Bank reconciliation, fixed assets, time and mileage
  • All reports and the audit-file export

Ptolemy Pro

€ 4.50 per month
  • Everything in Ptolemy Solo
  • Receipt scanning with automatic data extraction
  • Sign in with Apple, cancel monthly
Questions

Good to know

Do I need an account?

No. The entire bookkeeping works without an account and without internet. Only receipt scanning needs one, because that processing runs on a server.

Where is my data stored?

On your iPhone, in a local database. It travels along in your normal device backup. There is no accounting server holding your administration.

Does it work on iPad or Mac?

Not at the moment — Ptolemy Solo is an iPhone app.

Can my bookkeeper get at it?

Yes. Per financial year you export a Dutch XAF 3.2 audit file, plus the same data as JSON. There's also a full backup you can restore.

Does the app file my VAT return?

The app prepares it: every posting falls into the right box and you see what you owe each quarter. Filing with the Belastingdienst you still do yourself — automatic submission is on the roadmap.

When is the app coming out?

It's in development and not in the App Store yet. Join the waitlist and you'll get one message when it lands.

Want to know first when Ptolemy Solo ships?

Leave your email address. One message at launch, nothing more.