Bill One AI features and pricing (October 2026)

Bill One is a cloud service from Sansan Inc. that receives all incoming invoices of a Japanese company in one place, digitizes them with AI and human checks, and prepares journal entries and purchase order matching for the accounting team.

Bill One receives paper invoices at a scanning center and takes PDFs, emails, downloads and Peppol e-invoices, so suppliers do not need to change how they send. The service adds approval workflows, purchase order matching, payment preparation and an archive that is JIIMA-certified under the Electronic Bookkeeping Act. Sansan also offers Bill One for expenses and for receivables, plus invoice issuing.

Sansan Inc. is headquartered in Shibuya, Tokyo, and also runs the contact management service Sansan. Pricing depends on the annual invoice volume rather than users.

• Digitizes incoming invoicesBill One combines AI reading with data entry operators to turn every invoice into structured data down to line items. The vendor states 99.9 percent accuracy, so accounts payable staff work with checked data instead of typing invoices.
• Suggests journal entriesAI auto-journaling uses invoice lines, the link between sender and recipient, past entries and department data to propose account codes and posting departments. Confirmations by staff flow back as training data, so rules do not have to be maintained by hand.
• Matches invoices to purchase ordersThe matching function compares invoices with purchase orders on totals and line items. AI handles different spellings of the same item, which reduces manual comparison and shows mismatches before payment.

• Receives paper invoices on the customer's behalf at a scanning center, alongside email, PDF and Peppol e-invoices.
• Priced by annual invoice volume with no per-user fee and no storage limit.
• JIIMA-certified archive under the Electronic Bookkeeping Act and checks against Japan's qualified invoice registry.

Sansan is based in Tokyo; Bill One is JIIMA-certified for Japan's Electronic Bookkeeping Act and checks registration numbers under Japan's qualified invoice system.

Bill One is built for invoices addressed to entities in Japan and has a Japanese interface, so it fits a Japanese subsidiary rather than a European AP team. The product page lists single sign-on, two-factor authentication and IP address restrictions, but the public pages do not state the hosting region; ask Sansan where invoice data is stored and whether a data processing agreement is available for a European parent. Confirm which accounting or ERP system you connect, since the FAQ names none specifically.

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