ArpAccurA — an AI colleague for accounting and audit firms
Our own product: a desktop app that prepares the routine work while the professional keeps the decision
- YEAR
- 2026
- CATEGORY
- Software
- STATUS
- ROLLOUT
- CLIENT
- ArpAccurA
- TECHNOLOGY
- Electron, TypeScript, Claude Agent SDK, Node.js, PostgreSQL, Docker
The starting point
In accounting firms, much of the month-end close is routine work: matching tax authority, bank and ledger data, listing and requesting missing documents, following changes in the law. Auditors lose time to searching, documentation and admin instead of professional judgement.
Before building, we surveyed accounting firms. Most respondents would first hand over requesting documents and chasing what is missing, and at most firms documents are regularly missing for at least half of the clients at closing.
What we built
- Windows desktop client: a Hungarian-language AI assistant that prepares searching, documentation, matching and document requests; the decision always stays with the professional.
- Month-end close for accountants: reads tax authority, bank and accounting software exports, matches them, builds a list of what is missing, then, after approval, writes to the client and sends reminders.
- Audit modules: reading Metrum Referencia and APex files and writing to them after approval, step-by-step engagement setup, file review against professional standards.
- Knowledge packs: signed, versioned professional content, for example on changes in the law. Nothing installs itself; the firm decides.
- Own AI gateway and licensing: AI calls go through our own EU gateway, usage is metered per firm, and modules are licensed separately.
- Web admin: firms, machines, modules, trials, invoicing, announcements and surveys.
- Automatic updates with a signed release manifest and verified downloads.
Integrations and technology
The desktop app is built on Electron and TypeScript, with the Claude Agent SDK for the AI part. The server side is Node.js and PostgreSQL in Docker. Integrations: Hungarian e-invoice (NAV Online Számla) exports, CAMT.053 and MT940 bank statements, RLB (Kettős) accounting exports, Metrum Referencia, APex, e-mail.
Data protection is a core principle: client data stays on the firm's computer, and only the part needed for the task goes to the AI, encrypted, through our own gateway. The accounting software is only read, and nothing is sent or written without approval. Licences, knowledge packs and updates are signed with Ed25519 keys, and more than a thousand automated tests run before every release.
How it went
The product started on 17 October 2026. The foundations, licensing and knowledge packs came first; on 21 October the accountant survey set the direction for the month-end close. The first installable release shipped on 27 October. Version 0.3.0 arrived on 2 November with the full month-end close, and it read the first real, anonymised accounting export without errors.
Where it stands
It is in the pre-pilot stage. The gateway, the admin and the 0.3.0 client are live and can be downloaded from the product site. The first real trial of the month-end close at a firm is being prepared.
