aarven

Aarven is a Swiss double-entry accounting system (CHF, Swiss SME chart of accounts, Swiss VAT/MWST) built for small businesses and fiduciary offices (Treuhänder) that manage several client companies.

With the Aarven connector, Claude works directly with your books:

• Answer questions about your financial position: bank and cash balances, receivables, payables and equity from the balance sheet as of

any date.

• Analyse revenue, expenses and profit for any period and compare months or years.
• Prepare the Swiss VAT return (effective method or net tax rate method / Saldosteuersatz), including a reconciliation against the VAT

account balances.

• Look up bookings and the transactions of individual accounts.
• Draft bookings from your description or from an invoice you share, using your own chart of accounts and VAT codes. Bookings are always

created as drafts; they are only posted when you explicitly ask for it, and Claude asks for confirmation first.

You sign in with your Aarven account via OAuth and choose which company Claude may access and whether it may only read or also create bookings. Every connection can be revoked at any time under Settings > API access in Aarven. Aarven's user interface is in German; Claude answers in your language.