BillOS

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BillOS is invoicing and bookkeeping software for freelancers and small businesses in Israel. Issue tax invoices, receipts, tax invoice-receipts and credit notes in a few clicks, send price quotes that customers approve and sign from a link, and keep customers, open balances and expenses in one place. BillOS is registered in the Israel Tax Authority software registry (certificate 269101) and requests allocation numbers automatically. Accountants get read-only access and ready exports (MOVEIN for Hashavshevet, PCN874 and the unified file format). Developers get a REST API (OpenAPI 3.1), signed webhooks, Node and Python SDKs, a CLI and a hosted MCP server, with a free self-serve sandbox. Every document is stored and backed up in the cloud, including on the free plan. Start free, no credit card required.