Steward (Fast Accounting) AI features and pricing (October 2026)

Steward is the accounting AI of the Tokyo company Fast Accounting. Large Japanese companies and their shared service centers use it to read invoices and receipts, verify them against entries and expense claims, and exchange e-invoices over Peppol.

Steward, formerly called Accounting AI Agent, bundles several services: journal entry support that reads invoices and receipts and proposes accounts, payment verification that compares invoices with what staff entered, expense verification for employee claims, and a Peppol access point for sending and receiving digital invoices through an API. The engine can be connected to existing workflow and ERP systems via API, and a browser application called Remota serves users without their own integration. Fast Accounting was founded in June 2016, is headquartered in Minato, Tokyo, had 74 employees at the end of 2025 and is listed on the Tokyo Stock Exchange Growth Market under code 5588.

• Captures invoices and receiptsThe AI reads the content of invoices and receipts, fills in the data entry and infers the appropriate accounts for the journal entry. Accounts payable staff no longer type document details by hand and mainly check the proposals.
• Verifies payments before releaseBefore payment, the AI checks whether the invoice content matches what an employee entered, and it looks for duplicate payments and account errors. Finance catches mistakes before money leaves the company instead of in a later audit.
• Checks expense claimsThe AI compares employee expense claims with the attached receipts, detects duplicate submissions and policy violations, and approves or returns claims automatically. Reviewers only handle the cases the AI cannot clear.

• Runs its own Peppol access point, so AI document checks and e-invoice exchange in the Japanese Peppol network come from one vendor.
• The security page lists ISO/IEC 27001 and ISO/IEC 27017 certification and a SOC 2 Type II report, with the report available to customers and prospects on request.
• Aimed at large enterprises and shared service centers, which connect the AI engine to existing ERP and workflow systems through an API.

The vendor Fast Accounting is based in Tokyo, listed on the Tokyo Stock Exchange and names mainly large Japanese groups as customers, such as Kirin, Yamaha, Kyocera and Asahi Kasei.

Steward is built for Japanese accounting rules, Japanese documents and the Japanese Peppol network, so companies outside Japan should confirm language support for foreign invoices and local e-invoicing formats. Ask in which cloud region data is stored, since the security page names AWS and Microsoft Azure without a region, request the SOC 2 Type II report, and clarify pricing, which is only available on request.

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