The operating system for the outsourced accounting firm.
One place to run the books for every client and every entity — bank feeds in, an append-only ledger underneath, multi-dimensional reporting on top, and AI that does the first pass so your team spends its time on judgment, not data entry.
Above the weather. The system holds you up.Aunshin Books is a multi-tenant accounting platform built for firms that keep the books for other businesses — many clients, many legal entities, one system that holds them all.
Most accounting stacks were built for a single company doing its own books. A firm doing it for dozens of clients ends up stitching together logins, spreadsheets, and a different tool for every gap. Aunshin Books is the opposite of that — multi-client and multi-entity from the first line of code, with consolidation, allocations, and intercompany handled in the ledger instead of in a workaround.
It is white-labeled to your firm, so your clients see your brand. And every number traces back to a source: a posted journal entry, a bank line, a document. The books are a record you can stand behind, not a black box.
Built around the work a firm actually does.
Multi-entity consolidation
Close every entity, then roll them up to a consolidated trial balance that nets to exactly zero — allocations, intercompany, and eliminations handled where they belong.
Multi-dimensional reporting
Slice the same ledger by location, department, program, class, provider, or payer. Financial statements and dimensional views that drill back to the source line and the document behind it.
Tiered AI, human-gated
Three layers of assistance — accounting, controller, and CFO — that draft categorizations and surface what needs attention. Every suggestion is reviewed by a person before it touches the books.
Bank feeds & reconciliation
Connect each client's bank accounts and pull transactions automatically, deduped and reconciled against the ledger — so the books stay current without manual exports.
Connect once. The system keeps up after that.
Sign in with your work account
Your team signs in with Microsoft or Google — no separate passwords. Access is scoped to your firm and the clients each person is assigned.
Connect each client's accounts
Link a client's bank accounts through a secure, bank-hosted connection. Transactions flow in on their own and reconcile against the ledger.
Review, close, report
AI does the first pass; your team reviews and posts. Close each entity, consolidate, and hand clients reporting they can actually read.
We ask for exactly what the work requires — and we tell you plainly what each connection does.
Sign-in (Microsoft / Google). We use your work account only to verify who you are and which organization you belong to — your name, email, and basic profile. Nothing more; we never read your mailbox, files, or calendar.
Bank connections. When you link a client's account, you authorize it through the bank's own secure flow. We receive account and transaction data to keep the books — we never see or store bank login credentials.
Exactly how each piece of data is used, stored, and deleted is written out in the Privacy Policy.
Designed for data you can't afford to get wrong.
This system holds other people's financial records. We built the data rules before the features — and we don't ship anything that breaks them.
Encrypted, isolated by tenant
Data is encrypted in transit and at rest, and every record is scoped to one firm. A user only ever reaches the clients they're authorized for.
An append-only ledger
Posted entries are immutable — corrections are new balanced entries, never silent edits. The books are an audit trail by construction.
We don't sell your data. Ever.
No advertising, no data brokers, no selling of personal or financial information — not now, not later.
AI on a short leash
AI assists; people decide. Model providers operate under no-retention terms and never train on your data.
Least-privilege connections
We request the narrowest access that does the job — sign-in identity and the bank data needed for the books, nothing more.
The marketing is the promise
Every claim on this page is checked against the actual data flow. The words and the code have to agree — that's a rule, not a preference.
Aunshin Books is onboarding its first firms.
If you run an outsourced accounting or bookkeeping practice and want to see it, reach out — we're taking early-access partners now.
[email protected]